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Brakes stick after letting off pedal

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Old Nov 8, 2005 | 08:54 PM
  #1  
91tpiTA's Avatar
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From: Detroit
Car: 91 T/A, 79 T/A
Engine: 305 TPI, '68 350 Olds SC'ed
Transmission: 700r4, 350 Streetfighter
Axle/Gears: stock, 3.42
Brakes stick after letting off pedal

Everytime I stop, then go, I let off the brake pedal and the caliper doesn't let go of the rotor until I give it gas. It does sort of a "WUH" noise as I let off the pedal and try to go. I use to have an '89 Formula that when you let off the brake pedal, the car would idle and pull forward, which I like. But since getting this '91 T/A, the front brakes have been pissing me off. I lubed the slides on both front calipers and checked for any abnormalities, and it still didn't fix the problem. I feel like it's holding the car back from any possible get up off the line! I don't have rear disc and fluid level and color is good. Any ideas?
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Old Nov 9, 2005 | 12:39 AM
  #2  
SDIF's Avatar
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From: Aiken, SC
Car: 91 Z/28, 89 RS Race Car
Engine: 305 stock / ZZ4 AFR 195 9.7:1
Transmission: T5 / t10 / Jerico
Axle/Gears: 10blt w 3.42, 9 in w /3.80 DL
Replace both front rubber hoses.

It sounds like you have a fray on the inside of the line acting as a flapper valve. It traps line preassure in the calliber.

I have had this issue on two cars and tried everything before this cheap fix.

Try this first
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Old Nov 9, 2005 | 07:41 PM
  #3  
MurcoRS's Avatar
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From: Minneapolis, MN
Car: 1989 Camaro RS
Engine: ZZ4 350
Transmission: T-5
Axle/Gears: BW 9-bolt w/3.73
And if that doesn't work I'd look at the calipers. If they are binding (sludge build-up, corrosion, heat-stress) they will not release properly. After that you have 2 options - Master Cylinder has died (only buy new) or the booster return spring has weakened (easy diagnosis).
Good luck!
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Old Nov 26, 2005 | 03:46 AM
  #4  
Eightyninef's Avatar
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replace both front brake hoses.
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Old Nov 26, 2005 | 08:03 AM
  #5  
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
What those guys said.

JamesC
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Old Dec 3, 2005 | 03:20 AM
  #6  
Zap Racing's Avatar
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From: Houston Texas
Car: 1989 IROC Z-28
Engine: L98 350--modified
Transmission: 700 R4--modified
Axle/Gears: 4:10 Posi
If U want to see an actual improvement in pedal, replace those rubber hoses with hard lines such as Earl's. I did and there was actually a noticable difference in the pedal. Well worth the 80/90 bucks, IMO.
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Old Mar 5, 2006 | 01:26 AM
  #7  
91tpiTA's Avatar
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From: Detroit
Car: 91 T/A, 79 T/A
Engine: 305 TPI, '68 350 Olds SC'ed
Transmission: 700r4, 350 Streetfighter
Axle/Gears: stock, 3.42
Yeah, the car has been in storage for winter while I'm school, but it will be out soon! The car only has 70,000 miles, so it sits alot, would that be a failed master cylinder or just the hoses like it seems? I hope it's the hoses. Should I buy the hoses from GM or Auto Zone?
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Old Mar 5, 2006 | 09:44 AM
  #8  
Zap Racing's Avatar
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From: Houston Texas
Car: 1989 IROC Z-28
Engine: L98 350--modified
Transmission: 700 R4--modified
Axle/Gears: 4:10 Posi
Originally posted by 91tpiTA
Yeah, the car has been in storage for winter while I'm school, but it will be out soon! The car only has 70,000 miles, so it sits alot, would that be a failed master cylinder or just the hoses like it seems? I hope it's the hoses. Should I buy the hoses from GM or Auto Zone?
Could be a numbr of things--more than likely, the calipers are sticking, or possibly the piston that pushes the pads or the shoes to make contact. Try oiling it/them (especially if the calipers slides (bolts) are rusted. Hopefully it is something as simple as that. Oil them up, flush the brake fluid (not just bleed), and have somebody watch the rubber hoses while pumping them up and see if the hoses are collapsing. Good Luck!
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Old Mar 5, 2006 | 08:01 PM
  #9  
MurcoRS's Avatar
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Joined: Dec 2003
Posts: 690
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From: Minneapolis, MN
Car: 1989 Camaro RS
Engine: ZZ4 350
Transmission: T-5
Axle/Gears: BW 9-bolt w/3.73
Originally posted by Zap Racing
Try oiling it/them (especially if the calipers slides (bolts) are rusted. Hopefully it is something as simple as that. Oil them up, flush the brake fluid (not just bleed), and have somebody watch the rubber hoses while pumping them up and see if the hoses are collapsing. Good Luck!
Do not "oil them up"!! Any kind of petroleum-based lubes will attack the rubber in your brake system and contaminate the system.
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Old Mar 6, 2006 | 07:55 AM
  #10  
Zap Racing's Avatar
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From: Houston Texas
Car: 1989 IROC Z-28
Engine: L98 350--modified
Transmission: 700 R4--modified
Axle/Gears: 4:10 Posi
Originally posted by MurcoRS
Do not "oil them up"!! Any kind of petroleum-based lubes will attack the rubber in your brake system and contaminate the system.
I was referring to the slide bolts for the calipers--sorry if I did not state that correctly.
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Old Mar 29, 2006 | 02:35 PM
  #11  
91tpiTA's Avatar
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From: Detroit
Car: 91 T/A, 79 T/A
Engine: 305 TPI, '68 350 Olds SC'ed
Transmission: 700r4, 350 Streetfighter
Axle/Gears: stock, 3.42
Originally Posted by SDIF
Replace both front rubber hoses.

It sounds like you have a fray on the inside of the line acting as a flapper valve. It traps line preassure in the calliber.

I have had this issue on two cars and tried everything before this cheap fix.

Try this first
Hello, do you need special tools to remove these kinds of hoses? I looked at it, and I've never removed something like that before.
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