You were lucky with your cylinder. I recently pulled one off of a K 75, which was so badly corroded that the piston was frozen into the outer housing. It’s resisted every attempt from hammering to pressing in a vice to the point where we just ordered a new master cylinder. By the way, I keep a handlebar mounted MC to use in pumping out caliper pistons and stubborn MC pistons. It usually works unless totally corroded.
@not-fishing47303 жыл бұрын
Thanks for the video, it helped me rebuild my Brembo 15/16 rear for my "ran when parked a decade ago" '84 Moto Guzzi V65SP. The only thing additionally I had to do was seat the seal /tapered washer assembly with a deep socket. The barrel of the Brembo body is stepped. Also the Guzzi Brembo has a plastic piston stop which fits before/inside the spring. I got the seating procedure from a Guzzi Forum.
@BrooksAirheadGarage3 жыл бұрын
Hi Mark. Cool beans. I'm glad it all worked out for you. :-)
@honzasgarage5125 Жыл бұрын
I'm currently working on a 82 R100RT. Your videos are so helpful, thank you!!
@BrooksAirheadGarage Жыл бұрын
You're welcome. I'm pleased this content has been helpful. 🙂
@polmanuelgenero84237 ай бұрын
9:51 la ultima arandela sustituye al circlip que sujeta el conjunto dentro de la bomba, para montarla tienes que presionar el eje de la bomba hasta el final y con un vaso largo apoyar en el interior sobre la ultima arandela y golpear hasta que entre en su alojamiento
@BrooksAirheadGarage7 ай бұрын
English Translation: The last washer replaces the circlip that holds the assembly inside the pump. To assemble it you have to press the pump shaft all the way and with a long glass, place it on the inside of the last washer and hit it until it fits into its housing.
@Steve.D15 күн бұрын
Another great video. Thank you.
@BrooksAirheadGarage14 күн бұрын
You're welcome Steve, I'm glad it was useful to you. 🙂
@SteveGraham-dq8mq Жыл бұрын
Just done the job your clips are invaluable,l had much trouble getting piston out it was solid,tried your ways even blowtorch after shielding plastic nipple Finally had to drill oil feed hole 1mm bigger to get thicker drill bit in this did the trick,bore was good next problem the seal not staying in place, there's not Much on the web,but a thin wall 13mm deep socket,vice,and few taps with hammer seated it well,you did keep saying crush ring which suggested way to go Would be useful if you mentioned in clip as l can see others having issues,thanks for the informative pages
@bryankersten545 жыл бұрын
Thank you alot for the clear video and how to.
@doncook90345 жыл бұрын
Thank-you for posting.Very clear presentation
@BrooksAirheadGarage5 жыл бұрын
Don, Glad this was helpful.
@motorbikeslounge7 ай бұрын
Absolut legend! Thank you!
@BrooksAirheadGarage7 ай бұрын
Thank you 😊
@frankmummolo77274 жыл бұрын
Nice and thorough, as usual! Nice job!
@HiggensMovie2 жыл бұрын
Thanks for this video, i have a solution. Nice job 👍
@BrooksAirheadGarage2 жыл бұрын
Thank you. It nice to hear this was helpful.
@rustynuts823 жыл бұрын
Excellent instructions as always. I was finding that the assembly just kept on popping out under the spring pressure. I noted the slight step inside the bore where the outer seal and stiffening ring have to push in. I found a plastic tube that fit exactly over the stiffening ring and could tap it home into its seat....not sure how you managed just to push it home?
@BrooksAirheadGarage3 жыл бұрын
Biker's Welcome, Ah ... I just have Gorilla Thumbs I guess. :-)
@flammarama3 жыл бұрын
Great videos, thank you.
@BrooksAirheadGarage3 жыл бұрын
You're welcome James.
@rustynuts824 жыл бұрын
Top vid....tomorrow’s first job!
@BrooksAirheadGarage4 жыл бұрын
Best of success. 👍
@stevemiller43522 жыл бұрын
I am stumped. I have the parts in correct order, but have two issues. First is, what holds the front seal washer, seal & stiffening ring from backing out? It appears to have nothing except maybe some vacuum from the piston’s action to keep it there. My second issue is that now on reassembly, (a second time), with the piston fully bottomed out, (the spring fully compressed), the actuating arm pin holes are abt. .5mm from lining up, thus I cannot get them together, and if I did, there would be ZERO movement available with the actuation are (because the piston is fully bottomed out). Darn. I’ll go attempt another reassemble & see if anything has changed.
@derekmccarogher50804 жыл бұрын
Did you not have to press the seal/stiffener ring into the location recess after inserting the piston?
@craigb35484 жыл бұрын
Yes . That seal casing is an interference fit and needs to be tapped in with a suitable tube of about 19.5mm diameter. The actuation end of the piston will be about 4mm in from the end of the housing when fitted. Also what wasn't shown was the spring retainer that goes into the cylinder first.(Usually in the kit, but not shown.)
@Tall-Guy3 жыл бұрын
@@craigb3548 I agree with you about the seal needing to be tapped in but I believe the 1981 to 1984 bikes didn't have a spring retainer.
@RussellFitness-Trainer3 жыл бұрын
Thanks for the video,my master cylinder is a sealed unit not like this one a 1982 model,could you advise on how to open it to see if it can be restored? Thanks
@mharvs888 ай бұрын
Hi Brooks, how does the front seal stay inside the cylinder? Mine just keeps falling back out. Trying to bleed I had plenty of air coming through and I actually found the stiffening ring had fallen out completely when taken it apart. Thank you
@BrooksAirheadGarage8 ай бұрын
Take a look at the article on my website: brook.reams.me/bmw-motorcycle-rebuilds/1983-bmw-r100rs-rebuild-project-index/34-bmw-1983-r100rs-disassemble-inspect-rebuild-master-cylinders/#Assemble_Rear_Master_Cylinder_Rebuild_Kit
@flammarama3 жыл бұрын
I am rebuilding a R65LS front brake master cylinder, the book said to clean both holes, mine has one hole drilled through from the reservoir and one partially drilled, not through. Should there be two holes drilled through from the reservoir??
@BrooksAirheadGarage3 жыл бұрын
James, one hole feeds fluid from the reservoir to the plunger that pressurizes the brake line. The other hole lets fluid return from the line to the reservoir. Usually the smaller hole is the fluid return. That said, I've not worked on the R65 bikes and have no direct knowledge of how the front brake master cylinder goes together, but it looks to be similar to the one used on my 1983 R100RS/RT bike, but I didn't rebuild the front master cylinder so I never had an opportunity to inspect inside the master cylinder.
@flammarama3 жыл бұрын
@@BrooksAirheadGarage Thank you.
@bryankersten545 жыл бұрын
How did you removed that from the bike. I tried tday but i could not get a grib on the last bolt. Because it is behind the frame. Love your video''s great explanations keep them comming
@BrooksAirheadGarage5 жыл бұрын
Bjorn, here is a link to my documentation about that. brook.reams.me/bmw-motorcycle-rebuilds/1983-bmw-r100rs-rebuild-project-index/34-bmw-1983-r100rs-remove-brake-system/ You should always consult my web site for the detailed documentation of "how to ...". I make these videos to support the detailed documentation, but the write-up are where all the details are. I hope that helps.
as you know have always been watching & appreciating your videos- Is there a way to check the efficiency of the master cylinder hydraulic oil pressure on a gauge ? is there any Data available indicating how much PSI of hydraulic oil pressure must it measure on the gauge to check efficiency of the master cylinder- i have a friends BMW whose brakes need an overhaul so in order to establish the fault in either the cylinder or the calliper i thought this test could help me to diagnose the problem correctly !!! I keep learning watching your videos ! keep it up
@BrooksAirheadGarage3 жыл бұрын
Hi Rahul, I have no information on the pressure created by the master cylinder. As I show on my website, when I disassemble the master cylinder I check for corrosion on the inside. If there are pits and a lot of corrosion, I replace it. If it's minor scratching and light rust, I use 600 wet dry paper on a suitable sized drill bit to lightly hone the inside of the cylinder. That said, these are the brakes and they are critical safety items. If you have any doubt about the condition of a master cylinder, you should replace it.
@gentlerowdy3 жыл бұрын
@@BrooksAirheadGarage hi brooks you are always kind and polite to reply me with clean solutions
@TheRv18904 жыл бұрын
Does anyone know if the area under the plastic nipple where the brake fluid comes in has two holes or just one? Mine has one obvious open hole, but looks like it has another. I cant tell if it needs to be cleaned out or if its just a shut hole.
@craigb35484 жыл бұрын
There is a tiny port into the cylinder which is counter-bored to 1/8". Same diameter as the port at the lever side of the primary seal. The tiny port allows fluid to enter from the fluid tank to the spring end of the piston. Often blocks off with aluminium oxide corrosion. So yes there are Two.
@Hodado2 жыл бұрын
If there is any noticeable pitting in the bore can it be salvaged?
@BrooksAirheadGarage2 жыл бұрын
Gaylord, Small scratches can be removed using 600 grit wet/dry paper as I show on the web page documentation via the link in the video summary. Deeper pits can not be removed this way. If you have those, a new master cylinder is in order.
@Hodado2 жыл бұрын
@@BrooksAirheadGarage I’m not having much luck acquiring a master-cylinder that is good enough to rebuild and I hate to scrap the whole bike
@bryankersten545 жыл бұрын
Hmm its wierd the break still does not work correctly. I have the feeling that still some air Comes in some where
@alexbrm83834 жыл бұрын
Hi the team! Thanks for this video! I would like to know if the piston(15.87mm) can be replaced instead of the 14.29mm? Is it compatible in this way?
@BrooksAirheadGarage4 жыл бұрын
Hi Alexandre, BMW changed the master cylinder piston size in the 1981 model year (09/1980) to the smaller piston (14.29 mm). The smaller master cylinder requires less foot pressure but more foot motion to achieve the same stopping force on the disk. If you use the large master cylinder, you will have to push harder to get the same stopping force on the disk. Other than that, I believe the two master cylinders will work.
@alexbrm83834 жыл бұрын
@@BrooksAirheadGarage thanks a lot for your feedback ! Continue your videos it helps us a lot!👍👍👍
@geoffography4 жыл бұрын
hey brook, i'm trying to bleed my R100 rear brake that has a steel-braided line from the caliper to cylinder. It seems I can't advance the brake fluid from either the reservoir side or caliper side through the system. Removing the braided line from the cylinder and placing my thumb over the cylinder opening, I can feel pressure and suction when actuating the brake pedal, however no fluid travels through. Might the issue be within the cylinder or from the piston? I have not opened it up...
@BrooksAirheadGarage4 жыл бұрын
Geoffography, Since you have an aftermarket brake line, be aware many of them do not hold up well. There are some that it's easy to damage, particularly when removing the rear master cylinder. There is a small diameter tube in the core and on some of these braided steel lines, it gets kinked which blocks the fluid from passing through the hose. If you get pressure from the master cylinder when you push the piston, then I would suspect there is an obstruction in the brake line. Hope that helps.
@geoffography4 жыл бұрын
Thx! I tried to vacuum draw from the brake line submerged in brake fluid towards the caliper, went until bubbles went away, then separately hooked up a pressure bleeder to the caliper and pushed fluid back out the loosened banjo bolt at the cylinder end before capping it off. Ended up getting decent brake action only after leaving the caliper on rotor and using the pump to push brake fluid into the caliper, pushing pads against rotor, then released pump pressure and let out "excess" fluid through bleed bolt to free up pads from rotor.
@gregkassner77914 жыл бұрын
I need to know how to put together the front master cylinder please
@BrooksAirheadGarage4 жыл бұрын
Hi Greg, I didn't rebuild the front as it was trash. But I did disassemble it and that maybe helpful to you under the theory that "Assembly is the reverse of disassembly". This is the video link: kzfaq.info/get/bejne/la5_grJoy5muaYU.html And this is the link to the detailed procedure on my web site: brook.reams.me/bmw-motorcycle-rebuilds/1983-bmw-r100rs-rebuild-project-index/34-bmw-1983-r100rs-disassemble-inspect-rebuild-master-cylinders/ I hope that helps.
@yannmarchand38433 жыл бұрын
Hi Brook ! I lost an e-clip and its flat washer on one side of the pin. Do you know where i could buy them. I can't find the reference ... thank you very much
@BrooksAirheadGarage3 жыл бұрын
Yann, I would try to find these at a hardware store since they aren't specialized hardware.
@RussellFitness-Trainer3 жыл бұрын
Do you know where you can buy a replacement master cylinder? The 14.25mm, or any advice on how to make another one fit? Thank you
@BrooksAirheadGarage3 жыл бұрын
@@RussellFitness-Trainer Any BMW dealer can order them for you (part# 32 72 2 302 365). It mounts into the right handlebar casting.
@kenposkitt23863 жыл бұрын
Can you advise what the rebuild kit number is & where I can get one please? No joy whatsoever here in UK... thanks, Ken
@BrooksAirheadGarage3 жыл бұрын
Ken, click the link in the summary of the video. It will take you to the document on my web site which contains all the details of this work including parts. These videos are just a summary of the detailed documents I publish on my web site.
@kenposkitt23863 жыл бұрын
I'm a bit of a Luddite - where will I find the summary please? In the meantime I checked with BMW re the oem part number NLA!
@BrooksAirheadGarage3 жыл бұрын
@@kenposkitt2386 under the video pane is a written summary of the content of the video. In that summary is a link that you can click that will take you to the document. You can try Euro MotoElectric in the states or Moto Bins in the UK to see if they have the parts you need.
@bradyspage4 жыл бұрын
Whats the extra port on the bottom of the reservoir for?
@BrooksAirheadGarage4 жыл бұрын
Hi Brady: The second port is solid, as in it has no hole inside, and is not used. It's possible this reservoir is used in other applications where Brembo has it feed two master cylinders. Brembo would drill it out in that case. This is just an uninformed guess on my part.