In my humble opinion sir, you are a free man. Leave this court and continue your worthy crusade to educate us poor souls. Voice of reason, common sense and experience. Power to you Sire!

Excellent analysis as always. Have been jacking up 4x4s for over 40 years and always leave the jack in contact with the axle once lowered onto stands. Interesting analysis on the brake disc though it's something I don't do habitually as not all discs are created equal. I once had failure of a disc on a jeep (while driving) because the manufacturer in their cost cutting wisdom used pressed steel centres with the cast disc welded to it and readily prone to rust. A truly horrible idea.

Only one thing I love more than common sense, and that’s scientific justification for common sense! Thanks for another great video, sir!

Good stuff, thanks for info and effort. Side note: you hardly ever see a car propped on a thin tower of crumbling bricks these days.

Hello, this is Todd , I love ur correspondence and the factual information from an extremely intelligent and competent individual such as yourself. At some point, I would like to see a comparison analysis of shear, bending moment, and radial forces, as far as repairs on auto frames or modifications, using welding vs. the proper application of riveting.. joint tensile strength, shear , bending moment, and spiral twist flex loads. Thanku for ur time, look forward to a proven and proper analysis.

Gee, I wonder why the deck of PSV's is natural cellulose ? I never had any doubt.

Once again well presented and explained - NOT GUILTY 👍 😂

Only problem using the brake disk as support is that without the wheel it’s only attached to the hub with a small locating screw so any unexpected sideways load and it ‘could’ pop off. I’d use suitably sized wood over axle stands anyday esp if you have both wheels off as they will give better lateral stability ( suitably sized) than the rather narrow axle stand geometry.

Second comment re axle stands. I have three pairs, two of which are high lift, and one of those is ex NATO I never extend them more than a couple of holes, as it looks increasingly precarious. Always conscious of the triangular foot and the potential to tip, That’s why a two foot piece of sleeper with another on top then a 6” square oak post section on top,has such a massive footprint in all directions that with weight on, is not going to move anywhere.

Thank you for sharing!

i think if you've made it to this point you're doing something right. i would absolutely ignore people that leave daft comments . keep up the good work

just wanted to say i have really been enjoying your videos

Excellent analysis and explainatio - in my opinion a bit of overkill since very few are able to follow your hard evidence in the first place. I also believe that all KZfaq videos are suggestive and in no way instructions for which the one who goes through the troubles of making them be held responsible! Especially since there is NO agreement between the viewer and the creator! When I first heard of the rantings that came your way my thoughts were immediately "don't let it bother you". An oak doesn't care if a bore rubs his back on it!

Thank you Sir for this instructive info on this topic. It’s been extremely interesting. Cheers from a fellow Suffolkite! 👍🏽

I can attest to using dunnage. I once used a jackstand similar to the blue one in this video, on very hardpacked gravel, when the vehicle suddenly shifted as the jackstand sunk into what I thought was a safely hard surface. The only thing that saved me was my habit of putting the removed tires under the vehicle as a safety stop. After that, if I needed to use jackstands on other than concrete surfaces I would put a square of plywood and/or other dunnage under the jackstand.

What a breath of fresh air. Thank you.

Not guilty, I'm a firm believer in baulks of timber, they neither move nor break.

very useful. I bought a railway sleeper and cut it in the middle at 45%, with a chainsaw. I drive the car up on the two halves, its very safe.

100% with you. I always leave the jack under the vehicle after placing the axle stand. It would be mad not to. IMHO :)

very well put sir! Health and safety is for all those not educated to a high standard in common sense!

In the 20 years ive been working on or around cars I always leave the jack in place...why wouldn't you unless it's in the way? It can't hurt and if anything does shift its extra support

My two penneth. If I’m using a jack on a corner which weighs abit over half ton. I’ll use a 3 ton trolley jack or a four or six ton bottle jack. I’ll add support, either an axle stand or decent wood blocks with the largest and widest at the bottom and lower onto that. Then I tension the jack so it’s lifted the load by a fraction and now I have the solid support ready to “ catch” the jack if the jack fails or subsides. Also a good test to see if your jack is leaking by, where after an afternoon or day , is that fractional lift still there? All my axle stands are second hand but of very stout steel construction and by guessing I’d say are rated for many times the load I will ever give them. That means I’m confident to rely on them when underneath my 109. Like a Victorian viaduct, extremely over engineered.

That was what is known as a "Drops the mike reply"! 👍

you've put an admirable amount of effort into this assessment of your practices for a comment that probably should have been disregarded. but to ad to the conversation the only reason i personally stay away from supporting a vehicle on its rotors is the increased risk of it rolling, but if you're supporting only one side of the vehicle that risk seems rather low.

And therein lies the difference between a real Engineer and someone claiming to be an engineer - just because maybe their work title includes the word "engineer". It happens to those who don't know, that they don't know!

Excellent well reasoned response, as always. I think your methods are spot on and align with my own.

I started watching this thinking (and yes, im aware no-one asked lol) I watched that video, and didnt have any problems with the way you worked, especially not with the wood blocks, and I have no issue with leaving a jack support as a fail safe for the very reasons you go one about. Then you started on about the wood blocks, or dunnage to be more precise, and I was like ok good. lol.I do appreciate that you took the comment as well as safety seriously, rather than scoffing it off. I think most people dont quite appreciate the qualities of wood, being a natural material and somehow mysterious to many. While I wouldn't normally put wood or support directly on the disc (dont normally have a need to) if I were going to support it it would be with wood only, I wouldn't ever use a steel jack stand for that purpose, basically for the same reasons you point out here. While I dont expect an answer, I do have a question regarding your analysis: Would there be a difference in the load at the moment of impact, IE shock and would that make a difference? Clearly using wood means it softened that but id be curious if the numbers would be higher for a moment and if the time length of that shock load number mattered to the integrity of the iron? This is purely theoretical as a question mind you and I hope im making sense.

Well done, well done. I find it comical, honestly, how this internet age has made so many people with such little experience able to feel like superior experts on so many matters. The most blaring current example being, I seem to recall a certain submersible manufacturer who recently stated that the experienced submariners all seemed to be old, white military vets, and he wanted his project to reflect a younger, more diverse team. God rest him. There is good reason to respect one's elders, which goes well beyond age. While todsy one can certainly learn a lot about a lot online, and definitely find more than enough resource to get started, experience counts far more than youtube self-education. It's always wise to find an experienced mentor in any given subject.

A very comprehensive rebuttal, it would be worth annoying you with a negative comment, just to watch the educational reply video :)

Do me one favour don’t respond to the negativity, once you make a video specifically responding they’ve won. All these type people want is for you to waste your times educating keyboard warriors who already know it all. Excellent videos

Not guilty. Absolutely no point removing the jack. I shove the wheel I've taken off, under there as well, together with the axle stand and jack.

Put that in your pipe and smoke it 😂 what a legend

I work the same way as you, because I also prefer safety. Don't sweat the troll BS. It's just nonsense from someone who isn't prepared to address the underlying internal problem that leads them to engage in recreational outrage.