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Author Topic:   brake rotor bent
zeroracing
Dirt Forum Champ
Total posts: 1875
posted August 18, 2005 09:09 PM  
I put a new set of rotors on my car about 3 races ago, took it easy on them in the first heat cycle. Anyways, I was in an accident(pretty good rr wheel hit), and now the rr rotor is bent 75thousands, where as after wear on the lr and heat it is under 10. so i put a dial on the hub on the rr itself, it is no more than 5(when it bounces from paint to missing paint).
Have you guys had problems with bending rotors?? I thought before one bent much it would just snap and break. Or was this a heat deal and a junk rotor to start with.
These were the cheapy rotors.

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted August 18, 2005 11:46 PM  
if the rotor was cast iron, which most cheap types are, then yes they are notorious to bending. Most likely it was a combination of the heat and the hit, but I would lean more to the heat side. These weren't the $32 rotors from Speedway were they??? I had been wondering if Speedway's rotors were any good, not a bad price if they are decent rotors????????

rocket36
Dirt Freak

Total posts: 209
posted August 19, 2005 03:00 AM  
the only time i have seen a rotor bend/distort is due to heat & rapid cooling. very common on street cars when people use drive-thru car washes which leads to the possiblity that your crew (by mistake) may have doused the hot rotor with water while giving your car a sponge.
i have only seen rotors break under impact, sometimes crack under impact or heat cycles.

you may be able to save that rotor, if you can bolt it back up to the hub (and the hub doesn't distort) you should be able to clamp the hub in a lathe chuck and then face the rotor off true to the hub. thats all based upon if there is enough material there.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted August 19, 2005 08:37 AM  
I have acess to a machine that will clamp onto the rotor and turn it with it still on the car, dont have to take anything off but the wheel. But the guy that would do it said he would be weary of taking that much off the rotor.
These were the cheap ones.
which rotors have you guys had the best luck with? as far as heat, wear, and braking?

rocket36
Dirt Freak

Total posts: 209
posted August 19, 2005 04:09 PM  
we've just switched to the wilwood straight vane rotors. now we only need to carry one spare and can fit it on either side of car without any change in braking performance.
as we tend to run the right front brake "shut-off" most of the time, we have started rotating our rotors round the car, fitting the most worn on the right front etc, just trying to get full life out of them.
if your rotor has plenty of thickness, go ahead and machine it. if it turns out too thin, your no worse off, stick it in the garbage and get another one.

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