bxd20
CEG'er
I was at Mid Ohio a couple weekends ago and noticed that during extremely heavy braking the car had a tendency to pull just a hair, at least initially, then it would brake straight.
I believe the brakes are therefore operating unevenly side to side, just a hair. You don't notice during normal driving. You also don't notice at "full ABS" - my theory would be that each wheel is braking as hard as possible and ABS is keeping them all even. Whereas at 80% of a full panic stop, some wheels are probably at 85% of lockup and maybe another one is 80%??
When I got back to the "garage" I used my infrared thermometer to compare rotor temps and found a noticeable difference between front passenger and front driver rotors. Something like 300 F vs 360 F.
Since then I've also checked the rotors after normal street driving, and the difference is less but still there.
I also seem to have an imbalance from side to side on the rear.
I always do a thorough brake job, so I am sure the calipers and slides are clean and well lubed.
Is this bias problem due to the calipers, or by some brake proportioning valve? Do we have a valve? Would I have to remove the steel line from each caliper and check pressure coming through the hose to be sure?
I believe the brakes are therefore operating unevenly side to side, just a hair. You don't notice during normal driving. You also don't notice at "full ABS" - my theory would be that each wheel is braking as hard as possible and ABS is keeping them all even. Whereas at 80% of a full panic stop, some wheels are probably at 85% of lockup and maybe another one is 80%??
When I got back to the "garage" I used my infrared thermometer to compare rotor temps and found a noticeable difference between front passenger and front driver rotors. Something like 300 F vs 360 F.
Since then I've also checked the rotors after normal street driving, and the difference is less but still there.
I also seem to have an imbalance from side to side on the rear.
I always do a thorough brake job, so I am sure the calipers and slides are clean and well lubed.
Is this bias problem due to the calipers, or by some brake proportioning valve? Do we have a valve? Would I have to remove the steel line from each caliper and check pressure coming through the hose to be sure?
