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USAFPILOT
10-07-2016, 05:21 PM
Not sure which one or how, but after a while driving around I will notice my brake pedal become rock hard up high and that my car won't roll back if stopped on a hill. I can drive and if it cools down it goes back to normal. I was thinking about taking it up to brake check, but figured I'd see what y'all think first.
GOLDCYLON
10-07-2016, 11:11 PM
Brake booster issues.
Maybe vacuum leak to brake booster.


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My thoughts as well. GC
batchman
10-13-2016, 05:45 PM
An infrared pyrometer or even a careful wave of the hand near each wheel might narrow your search 75%.

I agree about the booster comments but that doesn't cover the "won't roll back until cooled" part of the concern.

I'd suspect a sticky rear caliper for that part of the problem.

Luck,
- Jeff
USAFPILOT
12-14-2016, 11:22 AM
took the car out this morning to see whats what, under very hard braking I can activate the ABS light and it feels like it cycles once, then the car will slide into a cloud of smoke. I end up with both front tires in skid, based on the width of the tire marks and my 335's on the rear I can deduce the rear brakes are not locking up, just the fronts. Correct me if I'm wrong, but my car should not skid correct? What can lead to this condition?
jss06c6
12-14-2016, 08:55 PM
Happy to look at it with you.. I'm in Magnolia. Let me know how your schedule sets up tomorrow.. I'll PM you my cell number..
USAFPILOT
12-14-2016, 10:30 PM
I dropped it off at a local shop, hope they can get it right.
jss06c6
12-14-2016, 10:36 PM
Ok, will be available to help as needed..

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USAFPILOT
12-14-2016, 10:38 PM
i can only handle so much frustration, gonna let the pros do a few things- brakes, suspension bushings, and an alternator.
G8nightman
12-15-2016, 12:26 AM
Might be your brake master cylinder how often do you change your brake fluid? Does the car pull when you brake? My friends 95 Z would not roll when brakes would heat up we replaced MC all good.


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We Gone
12-15-2016, 10:14 AM
Have you ever changed your front brake lines? I had an issue the same as you it was the inside of the front lines had gotten soft and were collapsing not letting the fluid go back to the master cylinder. As soon as I released the pressure by opening the bleeder on the caliper it released.
DRM500RUBYZR-1
12-15-2016, 10:49 AM
Have you ever changed your front brake lines? I had an issue the same as you it was the inside of the front lines had gotten soft and were collapsing not letting the fluid go back to the master cylinder. As soon as I released the pressure by opening the bleeder on the caliper it released.

I agree.
That would be my first suspect!
Explains the locking of front only.
M/C usually would affect all 4 the same.
The "cooldown" that fixes things might be a slow bleed off of the pressure, which could also point back to the M/C or the relaxing of the faulty hoses.
I would suggest switching to braided stainless lines on all 4 wheels as a good starting point, after inspecting all 4 calipers and lines for leaks.
Keep us posted on progress!
:cheers:
Marty
jss06c6
12-23-2016, 09:31 PM
What did the pros come up with?

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Dynomite
12-23-2016, 09:54 PM
What did the pros come up with?

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:happy1:
USAFPILOT
12-24-2016, 02:10 PM
still waiting
george1945
12-24-2016, 02:50 PM
I would look at the master cyl. And ABS
USAFPILOT
01-26-2017, 02:47 PM
Turned out to be sticking front brake calipers, pistons not returning caused by really really dirty old brake fluid. So, rebuilt calipers, fresh double flush of the system and the old girl is back in business. Well, on to the next problem anyway.
staminqia
04-14-2021, 09:10 AM
Turned out to be sticking front brake calipers, pistons not returning caused by really really dirty old brake fluid. So, rebuilt calipers, fresh double flush of the system and the old girl is back in business. Well, on to the next problem anyway.

When you had this issue was your brake light on the instrument cluster flash on and off while driving? I have a similiar issue with rear brakes slightly sticking and I know brake fluid looks pretty dark. I am wondering if I have a similiar issue.