Brake booster checks, operation and push rod adjustment

Рет қаралды 526,640

8 жыл бұрын

This video covers a number of aspects related to the testing and operation of a brake 'booster' otherwise known as a brake servo.
Firstly, we test the one-way valve in the vacuum supply pipe. Then I show you how to complete a simple on-car test to see if the brake booster is working correctly.
The theory on how a a brake booster increases the braking force is covered and finally I show you how to take measurements to check that the brake booster to master cylinder push-rod length is within specification.
If not then I show you how to make the necessary adjustments needed.
As you will see in the video, the importance of this push-rod adjustment is often overlooked by individuals. Whether you are replacing the brake booster or the master cylinder, having the correct clearance between the end of the push rod and the primary piston in the master cylinder is critical. If incorrect can cause issues relating to binding brakes and difficulty to bleed up the system.
Any questions please add them to the comments section below...
Andy Mechanic!

Пікірлер: 593

@patricianotyad5791 18 күн бұрын

This is exactally what I have been needing in my life! I know the parts, I know how to replace them. I just need to know how to test the components, to be sure I am not wasting time and money replacing the wrong parts! Thank you for the hard work to post these videos. They have just made my life a little easier, and a little better! THANK YO I

@TD-ue3bb 4 жыл бұрын

Only 8 minutes in and I have learned so much more that I didn't see in tons of other car repair videos I watched in KZfaq!!

@Mike_44 2 жыл бұрын

Very long video, most people today can’t watch something past 10 minutes, but what a fantastic and very thorough explanation! Way worth the time, a must watch! Thank you for posting this.

@AndyMechanic 2 жыл бұрын

Thanks :-)

@peterbird5719 Ай бұрын

Play speed to 1.25 and it's much easier to maintain focus. :))

@lewisogle296 Жыл бұрын

Thank you Mr. Young! I am 64 years old and have never known about adjusting the booster rod. I truly envy your students!

@rocknrod32 7 жыл бұрын

One of the only videos that actually discusses booster adjustable rod length (booster to master cylinder). Very thorough. Thank you from Texas. :)

@AndyMechanic 7 жыл бұрын

+Rod McAfee Cheers Rod, really appreciate the feedback and happy to know the info is of help. Drive safe. Cheers Andy

@peterbird5719 Ай бұрын

Thank You Andy. What an excellent tutor you are. As a design-engineer (now retired) from the marine industry and otherwise a lifelong (now classic-bike) motorcyclist I knew nothing about servos but what I'd deciphered from a workshop manual. Your explanation, together with practical demonstration was both enlightening and just what I needed as a confidence booster (pun unintended) to tackle my 1968's Daimler 250's (same as Mk2 Jaguar) servo. That happens to be a remote unit, but your tutorial is a foundation which I can readapt my car's specifics. i wish I were over there to buy you a beer or two. Cheers, Pete

@AndyMechanic Ай бұрын

Thanks Pete, it's great to know you found the video helpful. Good Luck on your Quest. All the best. Andy

@arthurfricchione8119 6 жыл бұрын

Andy your videos are fantastic. One of the best at explaining the mechanics and how components work with each other. Everything is brought down to a level of a mechanic and not an engineer. Being a mechanic I just enjoy your channel. Keep them coming.

@almiller5757 6 ай бұрын

I know this is an old video, but I can not thank you enough!!! I chased a front brake issue on a 1994 Dodge Dakota for months, first replacing all the "usual suspects" (rotors, pads, calipers, and brake hoses) and was pulling my hair out until I found your video and one other, both recommending this often-overlooked possibility. Turns out the booster shaft was about 1/8" too far forward, keeping just enough pressure on the front brakes to make them drag. Made the adjustment and fixed the issue. Thanks again!!!

@benjaminyoder7942 4 ай бұрын

61.16⁴😂

@benjaminyoder7942 4 ай бұрын

61.16⁴

@stormm787 5 жыл бұрын

I just received a Dorman master and Cardone booster for my 97 Wrangler. I bought both through Amazon which had indicated that they would fit. Was very nervous about installing both without knowing what the relationship was between the push rod and plunger. Using this amazing video, I found that there is a 0.0115" (0.292mm) clearance between the two. I triple checked all of my measurements and calculations assuming there was no way it would be this spot on between two different manufacturers. Now when I finally do the installation, I will know for a fact they fit. Without this video, I would always be suspicious of the installation. Thanks Andy!!!!

@AndyMechanic 5 жыл бұрын

Good Morning Charles, no problem at all. It's a clearance that is often overlooked, even by some Mechanics unfortunately. However, going by just how popular this video has turned out, a few more people are aware of it and the symptoms if there is no, or worse still, a negative clearance! Many thanks for the feedback & Good Luck with the install :-) Cheers Andy

@chyrice3787 4 жыл бұрын

never knew how brake booster actually works till i watched ur video, thanx alot!!!! great video.

@ronarndt6722 2 жыл бұрын

Andy, absolutely the best video / instruction I've ever seen. It now makes total sense relating to some elements of understanding I was missing. The additional attention to detail is super helpful and likely explains why I occasionally encountered very odd brake issues at times and certainly I will be applying the correct methods you explained. Thank you very much; and I believe you just helped me isolate / solve a 10+ year old issue on my 89 Toy 4x4 . Kudos!

@royreichow13 6 жыл бұрын

Best explanation I've found on KZfaq. Thank you. I really understand why my Wilwood brakes are locking up.

@fiver-hoo 6 жыл бұрын

Very passionate and knowledgeable instruction. Hopefully your students recognize the opportunity. Really enjoyed all 50 minutes. There is so much bad and wrong information about this topic on the forums, its great to see such a detailed breakdown. Everyone working on brakes needs to watch and understand this. Thanks for putting it out to the world.

@thefireman285 6 жыл бұрын

Thank you Andy. I am changing my power brake booster soon. I assumed the setting was factory set, however since I am not buying a new prefited master cylinder already attatched, I will make sure I check the spacing. Thank you for such an informative and complete video.

@ithiphonenonthaveth2410 4 жыл бұрын

Great detail explanation of the brake booster operations. It was very helpful to the replacement of the booster on my car. I learn a lot of things that I wouldn't have known before. Thank you for making this video.

@jake102308 7 жыл бұрын

Your videos are very informative, thank you. I've been working on my own vehicles since high school which is now over 40 years and I never knew how critical the brake booster push rod adjustment was. You're an excellent teacher in your videos and the 50 minutes on this video was interesting the entire time. Thank you again from Idaho, USA.

@AndyMechanic 7 жыл бұрын

+jake102308 thanks Jake. Sorry I couldn't reply earlier. I am out on a road trip around the North Island of New Zealand visiting Yamaha motorcycle dealers this week. Thanks for the feedback. Pleased you enjoyed the video. Cheers for now Andy

@2olvets443 4 жыл бұрын

m8 what a great instructor you are! Your students should feel very lucky to have you teaching them

@peterdavies2685 4 жыл бұрын

Many thanks Andy, I now understand something I previously had absolutely no knowledge of.

@dwaynemadsen964 Жыл бұрын

Test it before you fit it. New doesn't mean good, new means unused. Thank you for sharing and stay safe.

@mjrxyz Жыл бұрын

Just replaced master cylinder on 1978 Ford E-150 and had the exact problem you described at the beginning: brakes grabbing suddenly and hard. Now I know how to proceed with solution. Thanks, mate.

@nitroraptor70 6 жыл бұрын

Brilliant, cheers from NJ USA! I have a 66 Chevelle with a 383 in it, i am going to replace its Mechanical brakes to assisted and front disc brakes from drum. I've researched booster and mastercylinder, with proportioning valve packages quite a lot. Ebay has some of these at reasonable prices but comments are sketchy at best. Ranging from No peddle to no stopping power after the install. I wouldn't be surprised if problems were from that push rod, not being adjusted properly, which has kept me from getting one of them. My 383 only makes about 8-10 inches of vacuum so, i'm researching auxiliary vac pumps as well. But your excellent video has been a helping of food for thought Andy. Thank you!!

@danstiverson Жыл бұрын

Greetings from Pensacola Florida. 50 years I've worked on my own cars and never suspected the pushrod needing adjustment. Thanks for the info. Very needed. I replaced a master cylinder on my F150 recently and didn't adjust it. Now I will do the job again which is normal for me. Not that I like it. This makes sense when the remanned master cylinder has been cleaned up on the mating surface and material removed thereby lessening the clearance. 1mm seems like the likely amount removed on a machine.

@yazming1720 5 жыл бұрын

Awesome video...just purchased master & booster cylinders to replace on my 1974 Chevy Nova just because they are the orginals. Definitely will measure clearance. Working on Bronco that has touchy brakes when applied that your video will allow me to fix after many attempts. Thank You Mate😊 Yazmin Venice Beach CA 🏂🏁🏂🏁🏂🏁

@oldarkie3880 3 жыл бұрын

Wow! thanks for the great explanation. I may now have a clue about my check engine light and pulsating brake pedal at standing stop.

@melindasam 6 жыл бұрын

I just found your videos and this one was the most helpful I have found yet in diagnosing my brake issues. Thank you! My son loves cars and I am subscribing so he can learn from you.

@timanderson2222 4 жыл бұрын

Thank you for this video. Two months ago had master cylinder replaced. Since then the brakes would drag and on ocassions lock up. Pedal was always hard after a few minutes of driving. Had car towed two weeks ago because brakes were locked and wouldnt move. Two mechanic shops later and being told I needed a new abs module I came across this video. Ran this by the mechanic and he dismissed it. Picked the car up and adjusted it myself and now have a normal brake pedal, no drag and car cruises at much lower rpms.

@AndyMechanic 4 жыл бұрын

That's great news Tim, pleased the video has helped you & just proves if you want a job doing right then do it yourself! Cheers for now Andy

@123crazyleg 5 жыл бұрын

Thank you for all the info you gave me a lot more to think about and how important it is to get the adjustment fight, all the other videos just show you how to replace the unit without giving importan information about it which I can do myselt but would not know how to do the fine adjustment. THANK YOU

@jasnonya3005 2 жыл бұрын

Great vid. Ty for teaching this old school diyer a new truck! Awesome tutorial on something I've to tackle very soon. I was hearing a high pitched squeal, now it's a hissing/suctioning sound and to stop I've to push much harder! I'd already guessed it was the brake booster or servo. But I'd no idea how to adjust the actuator rod ty again and God Bless you for diseminating really great info!!!!

@richardcournoyer1473 2 ай бұрын

My brakes were dragging and locking after driving around and I had replaced all calipers and lines . i just went out and was able to crawl under the dash and adjust the pedal distance from booster rod and it looks like i have fixed the problem the pedal was real high and the valve you talked about may have not had enough space once fluid expanded. thanks👍

@benjaminmope8622 4 жыл бұрын

Thank you very much Andy..I'm just doing my apprentice and found most of your videos are really helpful..This one is the best one..Thanks thanks alot..❤❤🙏🙏

@AndyMechanic 4 жыл бұрын

No problem at all....I'm pleased you find them helpful. Thanks for the feedback. Cheers Andy

@rogerlarson8040 4 жыл бұрын

Very Good Andy. Thanks for posting this video. I had no idea i had to even think about the measurements you mention closer to the end of this video.

@offbyone3863 6 жыл бұрын

Andy great video I've a new Avenue to try to get stronger brake pedal pressure, you are absolutely right where you mentioned changing master cylinder and hydro boost and not adjusting brake push rod, I've gone as far as gravity bleeding brake, little result but not the way I know my brakes should feel, thanks for putting this video out there. ..

@H.pylori Жыл бұрын

Thanks you for this video. This has to be the best video on brake boosters and push rod adjustment that I have seen. Now even I understand how the system works. This explains why three repair shops say they can't explain why after changing out the master cylinder and the booster, my brake pedal goes way down towards the floor before the brakes engage. I bet that they did not do the meticulous measurements to readjust the push rod distance. especially since both the master cylinder and the booster are new and not OEM. Now I have to find a specialty brake shop where I live or send my car to New Zealand to be repaired.

@mohammedzulfiqar8672 7 жыл бұрын

A Very informative video sir with alot of knowledge, you got yourself a new student all the way from bahrain! ill be watching all your videos and learning. Thank you so much for sharing your knowledge with us. :)

@m.t.8181 5 жыл бұрын

I also congratulate you for this video.Thank you so much for sharing your knowledge. DIY from New Jersey, USA

@Stangrocka302 6 жыл бұрын

Subbed!!! This was the best automotive video I've ever seen!!! Thank you sir.

@AndyMechanic 6 жыл бұрын

+T3X4S B0Y Cheers & welcome aboard :-)

@DannyKellaher21 5 жыл бұрын

Supreme information! Explained perfectly...

@lonnieblackwell9215 3 жыл бұрын

This is the best video I have ever seen on brake booster. It was a very informative video. Great job.

@hellosamdwyer 3 жыл бұрын

Thank you for making this extremely detailed and helpful video!

@stevef8993 3 жыл бұрын

Andy, thank you for this video!! After multiple visits to my mechanic and $$ later I made the measurements myself and found that the push rod was 7.5mm too short and hence the delayed and soft pedal. Mechanic made several excuses that the rod should never be adjusted and then said he did make an adjustment but only a little bit. The one culprit with my car (300M) is there is a purge canister mounting bracket between the MC and BB which of course increases the distance between the BB rod and the MC piston. While this still didn't make up the entire distance it just proves that when either of these components are replaced, interference measurements MUST be made! Not sure that remanufacturing shops set to a standard or the FSM but my FSM doesn't mention the set distance so I'm guessing they just set a standard distance. Great videos and definitely subbed! Cheers!🍻

@AndyMechanic 3 жыл бұрын

Thanks Steve, it's amazing how many Mechanics aren't aware of this critical adjustment! Back to college I say! Great to hear the info in the video helped you out & improved the safety of your vehicle. Thanks for the feedback. Cheers Andy

@gesparksenegal5041 7 жыл бұрын

Hi Andy, Well done, very clear & professionnel demonstration Will test it. Thanks

@franklikespolitics 5 жыл бұрын

Excellent teacher. Thanks Andy.

@bushmain Жыл бұрын

Brilliantly done. Exactly what I've been looking for. Thank you.

@colindgrant 3 жыл бұрын

Just excellent. The detailed technical explanation is very helpful!

@freecheese4143 Жыл бұрын

I had wondered how it worked when my car stopped working. Great video mate!

@carrytrainer.editor3321 3 жыл бұрын

Great video! I installed a new brake booster and master cylinder without adjusting the rod at first... lol

@springy-2112 7 жыл бұрын

thank you for sharing this valuable advice ..just spent 6 weeks on and off about 8 full days completely replacing the full brake system on a 1984 escort..having bled the system twenty times even with pressure bleeder still have full brakes but low down the pedal travel...having ignored this adjuster thinking it was factory set I now am going to do this adjustment to see if I get pedal back... NEW discs new pads new shoes new drums new rear cylinders new master cylinder new braided hoses ..servo working ...5 litres fluid..pressure bleed kit... if only I knew about this adjuster... I will let you know the progress thanks again...

@jarrodgilbert9909 4 жыл бұрын

Wow... Such a good video! Thank you for making this!

@Welesly77 7 жыл бұрын

Thanks so much for this great video. Did not realize you needed to adjust the booster upon replacement of master cyl. Having the front brake lockup issue and trouble bleeding. Going to try this, pretty confident this is the issue. again, nice work!

@AndyMechanic 7 жыл бұрын

+Welesly77 Hey, no problem. Yes, seems like you have a class is case if 'negative' clearance there. Just shorten down the push rod a little and that should fix it. If you don't have the specs then just do a measure up and give it between 0.3 & 0.5mm that should work :-)

@rbbbjl1 5 жыл бұрын

Bobs your uncle, mate. That was one of the most entertaining and informative videos I’ve seen in awhile. The yank from across the pond

@LawrencefromIL 3 жыл бұрын

Excellent video, great explanation Andy! I'm converting from manual to power brakes on my '65 Chevy Impala and this is incredibly helpful showing in detail how to measure and adjust the pushrod-to-piston clearance. A big thank you from California!

@johnlampe3 5 жыл бұрын

Very nice job with the video! Well spoken and easy to understand, thank you

@AndyMechanic 5 жыл бұрын

Thanks. I do try to explain things in an easy to understand way & appreciate your feedback. Pleased you found the video helpful. Cheers Andy

@rannycopenhaver9934 3 жыл бұрын

Excellent! Very thorough and well explained.

@stephenlyttleton9032 4 жыл бұрын

Awesome video with great explanations. Glad I found this.

@allanhoare5516 3 жыл бұрын

Thanks Andy I am having problems with my brakes locking on and it looks like from your video that it could be push rod adjustment as one of the symptoms is that it only starts to happen after a good distance after things heat up not when cold. Truly well done video clear and easy to listen to, thanks again

@AndyMechanic 3 жыл бұрын

Hi Allan, yes, certainly sounds like it's a pushrod length issue. Good luck :-) Cheers Andy

@jchad3229 3 жыл бұрын

This is the second time in my life I've had a rod length issue. The first one was of a personal nature so you wouldn't have been much help, however, your video pinpointed that this time my rod was too long by .020 inches (.060 mm for you

@erik4369 3 жыл бұрын

Very good explanation, had the details I was searching for, Thank you from Tijuana

@nikkicarlson8511 6 жыл бұрын

Great video, always wanted to know more about brakes. Thanks!

@bigjvulcan5540 3 жыл бұрын

Thank you Andy, you may have just solved my problem. after replacing master cylinder and brake booster my front brakes keep locking up. I"ll have this checked out very soon. But this makes a whole bunch of sense. Thanks again.

@jesusguzman9809 6 жыл бұрын

That was a Great Video. Thank you for making the video. I learned a lot and will have to try in on my car.

@garyrose1043 10 ай бұрын

You forgot to bench test the booster. I like your video a lot thank you very much

@ricardomorancil8663 10 ай бұрын

Nice meeting you andy your tutorial is very informative thanks your time to share your knowledge 🤝🤝🤝

@MJ-nb1qn 4 жыл бұрын

Hello I Just found you! Great video. I learned this the hard way when I changed out a MC and did not check the length. Spent a great deal of time wasted till it hit me to check. In the past I was just lucky things worked out. I’d love to see a video on the proportioning valve on a 1978 Ford F-150. Drums rear, and disc front. Thanks!

@yeboscrebo4451 3 жыл бұрын

Thank you, learned a lot! From Sacramento California

@KrukasT4 4 жыл бұрын

Thank you very much for sharing. Nobody does this stuff. They just slam it in. Thanks from the Netherlands.

@christopherkelly3373 4 жыл бұрын

I found this video 100% useful ! Thumbs up ! Subscribed ! Thanks for sharing your knowledge on KZfaq !

@h3h3umm Жыл бұрын

Subbed. Explaining the job of each part was fantastic

@ralphfeldes9052 6 жыл бұрын

Thanks so much for this video Andy as you have solved my low pedal issue after years of driving my 47 GMC modified by who knows who ? with a Trans Am frame and a rebuilt Corvette 350 with modified front Discs and rear Drums. Thanks again!

@AndyMechanic 6 жыл бұрын

+Ralph Feldes No problem Ralph. If I was there you could take me for a test drive. Sounds a great car :-)

@MorrowSind 3 жыл бұрын

Incredible video. What a great teacher! Thanks for sharing. :)

@brandonsingh3987 7 жыл бұрын

thanks for your knowledge that you share here, very helpful watched did whole video and did not even realize hw long it was until the end, very well put together..

@alfonsoevangelista2314 4 жыл бұрын

Clear and complete presentation!

@chrisstate1129 5 жыл бұрын

Excellent job sir I'm having the same problem but nw that I see your video I think the push rod want to adjust good job

@klegraefe 7 жыл бұрын

Wow this was so acurate. On my current build My brakes kept dragging and i couldnt figure out why. Sure enough it was that adjustable rod. Just saved my ass from buying a new booster. Awesome video 👏🏻

@juiced71 3 жыл бұрын

Thanks Andy ! Just put a brand new master and booster on my 71 cutlass And pedal hard as a rock ! I figured maybe the hot cam was doing it but at 15 inches it should have at least 1 good stop! Or some assist and low and behold when you said afr will go up if the booster is leaking .. That’s exactly what mine was doing I would watch it go from 12.8 to 17.0 16.0 etc ....great vid! Just goes to show just because something is new doesn’t mean it’s good! Ugh!!

@wilbervaldelomar5309 2 жыл бұрын

Thank you so much Andy from Costa Rica great tutorial

@sleepyhead785 5 жыл бұрын

very helpful video, thank you!

@carlosg4575 2 жыл бұрын

Thank you. Learned so much from you right now. Just did a master cylinder and booster swap and never adjusted anything and been having trouble with a mushy pedal. Did the bleeding twice already but now going to adjust the pushrod like you showed on the video and hopefully that was my issue. Either way awesome video and clear information. Glad I found your channel and going to check out your other videos.

@kristopherlamb6385 2 жыл бұрын

Did this end up being your problem? I just replaced my master cylinder and am experiencing a very spongy pedal that goes to the floor when the engine is running. Have bleed all the brakes and abs unit multiple times. No fluid leak. Problem went away when I unhooked the vacuum hose. Wondering if the pushrod is too short for the aftermarket master cylinder.

@tapps1010 7 жыл бұрын

excellent explanation/ demonstration !

@normana264 4 ай бұрын

Thanks Andy!!!! Hope your New Year (now 2024 !!) is pretty Stoked Mate!

@AndyMechanic 4 ай бұрын

Thanks, pretty good so far! :-)

@Mega32roadster 5 жыл бұрын

I learned a lot thanks Andy!

@jandejong3922 3 жыл бұрын

Andy topvideo. i learn a lot from you. greetz jan from the Netherlands

@beastybmiked 6 жыл бұрын

I wish I had watched this a long time ago. I've had a problem with my brakes heating up and just figured out the pushrod was too long on the inside of the car. I adjusted it and they work perfect. I guess the pedal was letting in just a bit of atmospheric pressure and pushing on the master cylinder. Good job on the lesson.

@AndyMechanic 6 жыл бұрын

+beastybmiked sounds like you found the fault. Yes, both input and output push rods should have a small amount of free play. Cheers Andy

@jukkalapatto6244 5 жыл бұрын

Very good information in this channel.

@fjcook 5 жыл бұрын

Thanks for your very thorough video.

@AndyMechanic 5 жыл бұрын

Thanks :-)

@tomw.9627 4 жыл бұрын

Thank you for this informative video. I fought a Subaru Legacy with soft brakes for a long time , thought that was just how they would be. Replaced master cylinder..No help. Turns out that the booster piston was not extended far enough for the master cylinder that was installed. My daughter sends thanks , as the pedal is now how it always should have been.

@AndyMechanic 4 жыл бұрын

Cheers Tom, I'm pleased to know the info in the video has helped sort out the brake issue. This is an adjustment that is often unknown & overlooked when replacing one or both of the components. Drive safe. Andy

@frekkledipped Жыл бұрын

Thanks Ive been looking for someone who explains how to adjust that rod & measure etc as I have to install a whole new setup in my 1965 pontiac

@GerryJ08 6 жыл бұрын

Excellent tutorial. I'm guessing it would be easier to make the push rod adjustments with the brake booster out of the engine compartment? Many, many thanks from British Columbia, Canada for taking the time and effort to teach us.

@davidvannorsdall899 Жыл бұрын

Excellent video very helpful thank you for making this video

@timothyslater4347 7 жыл бұрын

Thank you you have help me lot loads with this video 👍

@Jerone5740 4 жыл бұрын

I needed this! you are very thorough, and I like that, thanks... new subscriber here

@hawkeyeCH53E 5 жыл бұрын

Great video, very informative. Thanks!

@AndyMechanic 5 жыл бұрын

Cheers

@rayb2078 2 жыл бұрын

very good educational video

@wadepower8412 7 жыл бұрын

thank you very much had this problem for many years now

@AndyMechanic 7 жыл бұрын

Sorry for the late reply Wade, that's great news, I'm really please this video has helped you get your car sorted. Yes, this is an issue that is very often overlooked by many mechanics and can cause some serious problems too. Cheers Andy

@VinDcator 3 жыл бұрын

A very informative and through explanation. The last mechanic working on my brakes was supposed to be ASE certified; he didn't know his ass from first base.

@stevengrappy8664 7 жыл бұрын

Great and informative video Andy. I look forward to reviewing your other videos. Nice refresher courses, lol. Anyway. I live in the US. in the northeastern area. A lot of corrosion and rust. A big problem that I see constantly here is when people are changing brake pads, They do not clean and lube the slides and pins, Therefore creating a braking issue. I can not tell you how often I have to use the torches to remove and replace frozen Caliper pins and boots. That would be a great video if you have not done so already, How to properly do a brake job.

@wolf424242 6 ай бұрын

Awesome video!

@jamesgregory7089 2 жыл бұрын

Great video. Very informative. I should probably remove the booster on my car. After watching this video I may have not adjusted the rod correctly. At cruising speed I cannot achieve a sudden stop or a quick stop if I needed to. Pretty scary knowing there's a possibility you might slam into rear of car in front of you if they suddenly braked hard. This video is very well explained Andy.