Mark4545

Just started tracking my AP2 S2000 with 25,000 miles on it. Original owner had stoptech cryo rotors with Hawk Street Race pads. I roasted the rotors and pads during the event. Experienced both steering wheel and brake pedal pulsating.

I decided to go with Sakebomb Garage Wilwood Track day brake kit with Endless ME20 pads. After installing and going to a track event I’m still experiencing some light pulsating in the brake pedal and in the steering wheel. I took off the rotors and recleaned the hubs but the problem was still there. After a visual inspection I didn’t notice anything out the ordinary. I pulled the ebrake while driving at low speeds to check the rear but no pulsating. So it’s definitely the fronts.

Any suggestions??? New hubs and bearings?

Do you think I could have damaged the hubs while tracking the car on the original bad brakes?

Car Analogy

Two thoughts.

1. Wheels overtorqued?

2. Maybe ebrake isn't enough of a test to rule out rear rotors.

You'll go through rear rotors eventually, and not that expensive. Try a new set to more definitively rule out rear rotors. Not really an expense, just an advance purchase.

Or, use a dial indicator to measure rear rotor runout. You'll have future need for one, so go ahead and buy one now.

Xene

Could be improper bedding of pads I had this issue before. Is the rotor brand new as well? Cause if old material on it from previous pad compound it can make pedal feel rough.

Mark4545

ThreeD

I don't think it could have damaged your hubs, but you could have had bad hubs to start since you had problems with a different set of rotors and pads. Get your rotors checked first in a reliable fashion, and go from there. Could be pad buildup issues, even if you bed it "properly".

toplessPolak

DanielB

It sounds like improper bedding, perhaps even smearing. That happened to me once when I installed a new set of pads different from previous material at the track. It happened first session of the day so I just drove through it. It was a warm day and by the end, the problem had fixed itself. So depending on how bad it is, you may be able to just get the brakes hot enough again to solve it.

andrewhake

Sometimes you need to do a much more aggressive bed-in process with track pads. You should be able to inspect the hubs and bearings for any play, if they seem fine then going through a 2-3 additional bed-in cycles (similar to what you did already with plenty of time to cooling between) may fix your issue. I do a ramp up to an extremely aggressive bed-in with new rotors and pads and rarely run into this issue on my Spoon caliper gyrodisc 2-piece rotor setup. You can smear the pads in a variety of ways, being too aggressive on the initial stops of the bed-in, not doing enough bed-in cycles, etc.

Mark4545