Warped Brake Discs & Other Myths About Braking Systems

[bigfoot]

Saw this article about car brakes, I thought I would throw it up for discussion.

It talks about a concept that brake discs don't warp & that it is just a build up of brake pad material on the discs causing the brake pedal shudder.

http://stoptech.com/technical-support/technical-white-papers/-warped-brake-disc-and-other-myths

[Smitty]

Saw this article about car brakes, I thought I would throw it up for discussion.

It talks about a concept that brake discs don't warp & that it is just a build up of brake pad material on the discs causing the brake pedal shudder.

http://stoptech.com/technical-support/technical-white-papers/-warped-brake-disc-and-other-myths

crock of shite.. and I say that based on many years of track experience (on race circuits not drag strips)

I have suffered disc rotors that have had large/long cracks in their outer surface... with the metal not able to deal with the
amount of heat put into during braking but I have also had disc rotors (plain, drilled, slotted) that have ended with
a face (that the pads rub on) that varies... 3, 4 maybe 5mm out as the rotor rotates. And on inspection one is
looking at rotor metal and NOT brake pad material. A rotor with 5mm runout can be easily checked with the
naked eye ( no dial gauge needed) and if you get metal hot (very hot) it expands .. thats simple physics
and if you heat one part of a piece of metal more than another part.... it changes shape. Panel beaters
know this and use it to their advantage. Us circuit racers know when it happens we will get a warped disc
( and hence cooling- water or air systems is very important for our braking systems)

ps I know who Carroll Smith is (no relation) but he is wrong about 'warped discs'... they happen.

imho of course :)

[Ausmartin1]

Agree... eg, Take a disc to high heat like when its working hard - then come to a dead stop and leave the brake pads applied.

Oh yeah it will spot them ... something called metallurgy of the disc material gets into the equation.

Maybe the so called expert should to talk to an engineer / metallurgist, might be a revelation for him lol!