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low speed brake noise-vibration

 
Old 06-16-2018, 04:22 PM
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Default low speed brake noise-vibration

Over the winter I replaced my front pads with Hawk Street/Race. I did not replace the Stoptech slotted rotors, which only had five track days on them. Neither did I replace the rear rotors and pads (same brands,) which similarly only had 5 track days on them. The rear pad wear indicators have plenty of room to go, although they are more worn on the outside.

Ran a track day with NASA at LRP on 4/13. After the last session, in the paddock, there was sort of a groaning sound when lightly applying the brakes. Itís intermittent but happens every drive. Best way to duplicate is driving around in a parking lot. I though I was going to have an audio but I guess I didn't turn on the damn camera, which was stuck in side the wheel well. It is definitely not pad squeal, more like a vibration caused groan.

These pads come with their own backing plate. Re-grease? The rear calipers, where I think the noise is coming from, are autozone remans, which suck as far as the parking brake is concerned. Everytime I set it, the setting is gone after one track day. Apparently the ratcheting is fubar.

Any thoughts or suggestions on how to fix? Don't really want to replace them just because of the noise.
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Old 06-19-2018, 05:13 PM
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Not a break expert but could the pads have been bedded incoreectly/ unevenly worn? I would grease the pins for the calipers and the mounting tabs for the pads to reduce friction where friction is not required. I would also inspect for dirt or rocks stuck in the pads and fasing on the disc. This bothered my daily for a while till I pulled apart my caliper and found a pebble between my pad and rotor. Pebble gone noise gone!
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Old 06-19-2018, 08:26 PM
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This, " I would grease the pins for the calipers and the mounting tabs for the pads to reduce friction where friction is not required." Did it today but haven't had a chance yet to drive the car. Also, my rear pads were two full turns out from the ebrake adjustment and I wonder if that couldn't cause some extra room for vibration. There was some crud in there as well. Hope to find out tomorrow.
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Old 06-19-2018, 08:37 PM
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If the sprimg pins arent there , or worn, you are gonna get some sticking pads causing vibrations
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Old 07-08-2018, 11:01 PM
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Fixed. Greased everything and still had noise. It was the passenger side front HUB. I'd heard a noise but thought it was the newish NT01s. Had tried to wiggle wheel back and forth to check bearing but it didn't move. I asked Jack at EFI Logics (who was doing my timing belt) about it. He lifted the car, knocked the pads back, spun the wheel and could hear the bad bearing, even thought no side play.

I put the new (used OEM repacked) bearing on and went for a drive. No Noise. By the way, this was my second TDR bearing to crap out within a year or two. Only buying used OEM from here on.
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