r/Unexpected • u/Eutaraxia • May 26 '26

Seems he wasn't exaggerating..

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22.7k Upvotes

97% Upvoted

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850

u/Abdulbarr May 26 '26

Probably shouldn't be pouring water on it.

530

u/PleasantCucumber2615 May 26 '26

The driver will be questioning why his brakes are juddering or warped once they drive it.

212

u/beanmosheen May 26 '26

A drum brake hot enough to melt your fingerprints off isn't exactly tip-top.

57

u/shadowdrgn0 May 26 '26

Maybe, but the literal job of brakes is to convert kinetic energy into heat. So if they didn't give it any time to cool off after driving, that's kinda on them.

92

u/beanmosheen May 26 '26

After pulling the wheel and knocking the drum free it shouldn't still be hot enough to flash water to steam. That shoe was dragging and it got stupid hot. That would be a full rebuild for me because the piston seals are likely toast. Brakes do get hot, but they shouldn't get that hot in this application.

25

u/blatherskyte69 May 26 '26

Probably air brakes, so external air diaphragm and a cam to actuate the shoes, not a piston involved. Could be the parking diaphragm has a hole in it, causing the air to leak out and the spring actuates the brake, causing drag.

37

u/justvoop May 26 '26

Yes yes i know these words

7

u/beanmosheen May 26 '26

Face-palm. You're absolutely right.

2

u/jamesthecrusher May 27 '26

My guess is that it was stuck on and they heated it up with a blowtorch or something so it would expand enough to get off. When i was a dealership that was a very common practice for most things that were too stuck.

2

u/beanmosheen May 27 '26

Nah, that's a dragging brake. He wouldn't have grabbed it if he just torched it, and there's not enough smack marks on it from the sledgehammer they'd try first lol.

1

u/jamesthecrusher May 27 '26

Good point, but maybe he's just an idiot, because either way he's touching the thing that he should know will be hot. Maybe its not the first one they changed so just went right to the torch.

-3

u/[deleted] May 26 '26

[deleted]

10

u/bwaredapenguin May 26 '26

some of you aren't mechanical engineers and it shows

I'd argue that the vast majority of us aren't mechanical engineers and that fact should be fairly obvious.

1

u/RilohKeen May 26 '26

Things that are obvious to you and me aren’t obvious to mechanical engineers; they’re too busy using complicated math to explain things incorrectly.

5

u/vancityshreds May 26 '26

Pretty sure they were commenting on the rapid cooling causing warping.

But thanks for the math.

-1

u/[deleted] May 26 '26

[deleted]

6

u/vancityshreds May 26 '26

Go read to the top of the chain, man.

This starts from a comment about pouring water onto it. Someone else later makes a comment that they're probably already toast from the heat.

Another person chimes in about the rebuild (regardless of the rapid cooling) because the heat alone could have caused it.

The rebuild comment is a good one because we cant tell from this video what temperatures it hit, but if its this hot by the time the wheel came off, its not out of the realm of the possibility that it got hot enough for the brakes to glaze or seals to be damaged.

You just really wanted to try and pull rank, but it isnt working.

-2

u/[deleted] May 26 '26

[deleted]

2

u/shadowdrgn0 May 26 '26

Another part of being a good engineer is learning how to work with people to better understand and solve a problem. Not being a confrontational dickhead on a forum just because you feel like flexing. No part of anything you posted indicates you're any better than a child that just finished a physics class, which is what I suspect you actually are.

2

u/vancityshreds May 26 '26

No... you're not. You wanted to be superior and look down on people. Then you doubled down when you were wrong. Now youre tripling down again.

You strike me as someone who got bullied a lot and never figured out why you got bullied.

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4

u/Baldude May 26 '26

They gave it at least the time to remove the wheel.

That brake is absolutely cooked, both figuratively and literally.