Warped rotors = vibration at speed?

gomer_110

A few things:

1. Rotors rarely actually warp. The phenomena that generally is to blame is brake pad deposits on the rotor face. Doing some hard braking from ~55 to 5 mph 5 or 6 times in a row and then allowing the brakes to cool without having the brakes applied at all may help.

2. Vibration at or above a certain speed with everything else being the same often indicates a wheel (or wheels) that are out of balance.

3. I like the Z1 2-piece rotors on my car but for a non-competition or HPDE car they are probably just a waste of money.

__________________
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'17 Titan Bone Stock

CRiZO

Thanks for the reply. Probably a coincidence of timing from two separate things then.

I'll give the hard braking a try, then get my wheel balance checked.

Car won't see more than hpde, but reducing unsprung weight is always a good thing and they're pretty and I just want an excuse

ZCanadian

This.

Here is a good primer on the subject:

https://www.facebook.com/notes/power...5888830742846/

Depending on what kind of pads you have (abrasive or adhesive), it could indicate an issue with the tire (flat spot) where the rotor is getting additional buildup or wear from the pads. But more likely either wheel balance or perhaps a tire defect coming to light.

True rotor "warping" is very rare. They are typically cast. Cast things don't warp, they crack and break. But a lot of shops will tell you they are warped because it's easier to part you from your cash. And more profitable than removing and turning the rotors or diagnosing and solving the real problem.