Rear brake grabbing early
- Hatchetf15
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Rear brake grabbing early
Gents,
My C2 left rear is locking up a little early during threshold braking, just before I start easing up. Stock rotor and warm Akebono pads. PSM off. Straight line or turn either direction. ATE fluid has less than 2000 miles. Any ideas on a fix?
Cheers,
Mike
My C2 left rear is locking up a little early during threshold braking, just before I start easing up. Stock rotor and warm Akebono pads. PSM off. Straight line or turn either direction. ATE fluid has less than 2000 miles. Any ideas on a fix?
Cheers,
Mike
- Hatchetf15
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Re: Rear brake grabbing early
Could be, Gnat. They have 90k on them.
Re: Rear brake grabbing early
Is alignment/camber correct on that corner? If the contact patch is smaller than it should be, the brakes may be overpowering that tire and locking it up.
Is the tread wear pattern the same on both rears?
In neutral on jack stands, does the problem wheel turn as freely as the non-problem side? Any bearing play/grind?
Is the tread wear pattern the same on both rears?
In neutral on jack stands, does the problem wheel turn as freely as the non-problem side? Any bearing play/grind?
Understeer: You will hit the wall with the front end.
Oversteer: You will hit the wall with the rear end.
Horsepower: How hard you will hit the wall.
Torque: How far you will move the wall.
Gone hunting with Alec Baldwin and Dick Cheney. Back soon.
- Hatchetf15
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- Joined: Thu May 10, 2018 5:14 pm
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Re: Rear brake grabbing early
5chn3ll,
When I get home next week, I’ll put it up and check bearing and caliper...bleed that corner just cuz. Fresh alignment (just -1.8 on the rears), fresh suspension everything and new-ish AS3+ shoes. That side didn’t chirp at all with the 19’s and PS4S.
Hatchet
When I get home next week, I’ll put it up and check bearing and caliper...bleed that corner just cuz. Fresh alignment (just -1.8 on the rears), fresh suspension everything and new-ish AS3+ shoes. That side didn’t chirp at all with the 19’s and PS4S.
Hatchet
Re: Rear brake grabbing early
Anything ever come of this?
Understeer: You will hit the wall with the front end.
Oversteer: You will hit the wall with the rear end.
Horsepower: How hard you will hit the wall.
Torque: How far you will move the wall.
Gone hunting with Alec Baldwin and Dick Cheney. Back soon.
- Hatchetf15
- NG (Second 100 Outposters!)
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- Joined: Thu May 10, 2018 5:14 pm
- Location: Smashville
Re: Rear brake grabbing early
So I thought if left rear is the grabby one, was it that brake late to the party, or the right rear? Thinking about all the reasons made my brain ache. So...
Eventually got done with troubleshooting on Thursday. Bearings, alignment all good. Going on assumption rear brakes are mostly mechanical issues, not hydraulic; I pulled both rear wheels. I pulled both calipers and used spreader to seat pistons. Eyeballed all the pistons for any variances. I cleaned both calipers and rotors and pulled the pads. Cleaned around the pistons with Dawn. Even wear (to be expected cuz they’re new) on pads.
I siliconed the pins and put pads in exactly the same on both sides, torqued the bolts to exactly the same number. Basically took as many variables out as possible between sides. Fixed! Not gonna comment on what coulda been the culprit cuz I’m not that car-smart.
Eventually got done with troubleshooting on Thursday. Bearings, alignment all good. Going on assumption rear brakes are mostly mechanical issues, not hydraulic; I pulled both rear wheels. I pulled both calipers and used spreader to seat pistons. Eyeballed all the pistons for any variances. I cleaned both calipers and rotors and pulled the pads. Cleaned around the pistons with Dawn. Even wear (to be expected cuz they’re new) on pads.
I siliconed the pins and put pads in exactly the same on both sides, torqued the bolts to exactly the same number. Basically took as many variables out as possible between sides. Fixed! Not gonna comment on what coulda been the culprit cuz I’m not that car-smart.
- FRUNKenstein
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Re: Rear brake grabbing early
Glad to hear you got it resolved. Thanks for the update.
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Current:
2002 996TT X50, Guards Red
1987 928S4, Guards Red
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1973 914 2.0 Bahia Red
2006 955S, Lapis Blue
Other toys:
1988 BMW 325i Cabriolet, Alpin Weiss
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Gone but not forgotten: 1975 914 2.0, Laguna Blue; 1999 996 C4 Aerokit Black; 1990 964 C2 Guards Red; 2006 955S Arctic Silver
Current:
2002 996TT X50, Guards Red
1987 928S4, Guards Red
1987 951, Guards Red
1973 914 2.0 Bahia Red
2006 955S, Lapis Blue
Other toys:
1988 BMW 325i Cabriolet, Alpin Weiss
1987 Bertone X1/9, Verde Chiaro
Gone but not forgotten: 1975 914 2.0, Laguna Blue; 1999 996 C4 Aerokit Black; 1990 964 C2 Guards Red; 2006 955S Arctic Silver
Re: Rear brake grabbing early
Voodoo mechanics FTMFW...
Understeer: You will hit the wall with the front end.
Oversteer: You will hit the wall with the rear end.
Horsepower: How hard you will hit the wall.
Torque: How far you will move the wall.
Gone hunting with Alec Baldwin and Dick Cheney. Back soon.
- Hatchetf15
- NG (Second 100 Outposters!)
- Posts: 129
- Joined: Thu May 10, 2018 5:14 pm
- Location: Smashville
Re: Rear brake grabbing early
Sometimes ya just gotta flash dem chicken bones! But really I wanted to get both sides the same, in case the problem didn’t get resolved. I even pulled and cleaned/moly lubed speed sensors. I guessed it was something simple. If the problem happens again, I’ll just summon the loa.