Front breaks lock up, back ones don't?
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 809
Likes: 0
From: Derry NH
Front breaks lock up, back ones don't?
I just had to make a hard stop and the front breaks locked up like they should but the back ones did'nt do anything to help stop the car.
I also noticed that the break pedal goes all the way down??? Don't tell me my booster is gone again....:( Has anyone had this problem???
[Modified by Road Racer, 8:26 PM 10/12/2002]
I also noticed that the break pedal goes all the way down??? Don't tell me my booster is gone again....:( Has anyone had this problem???
[Modified by Road Racer, 8:26 PM 10/12/2002]
Melting Slicks
Joined: Apr 2002
Posts: 2,337
Likes: 14
From: Norfolk VA
Re: Front breaks lock up, back ones don't? (Road Racer)
To test the operation of the brake booster is pretty simple. start the vehicle place your foot on the brake pedal...it should travel until it is an inch or two from the floor. Turn off the engine step on the brake pedal
the pedal should be firm (move slightly). A soft pedal is usually due to a leaking master cylinder. I agree with the above post. Check the fluid level in the master cylinder. The resivoir that is low is the culprit. Try bleeding the system and refill the master cylinder.
[Modified by Oldguard 7, 11:57 PM 10/12/2002]
the pedal should be firm (move slightly). A soft pedal is usually due to a leaking master cylinder. I agree with the above post. Check the fluid level in the master cylinder. The resivoir that is low is the culprit. Try bleeding the system and refill the master cylinder.
[Modified by Oldguard 7, 11:57 PM 10/12/2002]
Melting Slicks
Joined: Apr 2002
Posts: 2,337
Likes: 14
From: Norfolk VA
Re: Front breaks lock up, back ones don't? (Road Racer)
To test the operation of the brake booster is pretty simple. start the vehicle place your foot on the brake pedal...it should travel until it is an inch or two from the floor. Turn off the engine step on the brake pedal
the pedal should be firm (move slightly). A soft pedal is usually due to a leaking master cylinder. I agree with the above post. Check the fluid level in the master cylinder. The resivoir that is low is the culprit. Try bleeding the system and refill the master cylinder.
the pedal should be firm (move slightly). A soft pedal is usually due to a leaking master cylinder. I agree with the above post. Check the fluid level in the master cylinder. The resivoir that is low is the culprit. Try bleeding the system and refill the master cylinder.
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 809
Likes: 0
From: Derry NH
Re: Front breaks lock up, back ones don't? (Oldguard 7)
My fluid is full. But it looks a bit foggy. I replaced the booster and master cylinder a few months ago. I bench bled the master cylinder and bled my breaks like ten times each to clean the lines of old fluid. :(
Le Mans Master
Joined: Mar 2001
Posts: 6,638
Likes: 287
From: Ann Arbor Michigan
Re: Front breaks lock up, back ones don't? (Road Racer)
What kind of fluid did you use? It shouldn't look "foggy" after only a couple of months. Wrong fluid=swollen seals in master cylinder.
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Re: Front breaks lock up, back ones don't? (Road Racer)
I believe ther may be a problem with the proportioning valve. Is the brake lamp on (does it work)? If the valve is stuck in one direction (usually the result of the OTHER direction running out of fluid or developing a leak), then the failing side will not assist in braking.
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Melting Slicks
Joined: Aug 1999
Posts: 3,123
Likes: 13
From: Hollywood, Florida
Re: Front breaks lock up, back ones don't? (pws69)
I believe ther may be a problem with the proportioning valve. Is the brake lamp on (does it work)? If the valve is stuck in one direction (usually the result of the OTHER direction running out of fluid or developing a leak), then the failing side will not assist in braking.
Check the rubber hoses too. Detereation from the inside out causes uneven application of pressure.
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 809
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From: Derry NH
Re: Front breaks lock up, back ones don't? (Duke94)
I used a good quality sythetic break fluid. Should I try to drain all the old fluid again and put in fresh DOT fluid??? :confused:
Le Mans Master
Joined: Mar 2001
Posts: 6,638
Likes: 287
From: Ann Arbor Michigan
Re: Front breaks lock up, back ones don't? (Road Racer)
Sounds like you didn't get all the Dot 3 fluid out before you installed the Silicone which may be the reason for the foggy appearance, but not why the pedal goes to the floor. If there are no leaks, try to rebleed the system. If you get air out, then the caliper seals are probably used up. If no ait, then check the master cylinder seals.
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 809
Likes: 0
From: Derry NH
Re: Front breaks lock up, back ones don't? (Duke94)
I bled the breaks about ten times each. I went out for a test drive, the pedal was good for about five minutes and then went to the floor again and just front breaks again. So, I bought a new master cylinder, I bench bleed it and installed it. I bled all calipers againg about ten times. I got a nice feel on the pedal. I took car out for a test drive and in about two minutes the same thing happened again. :( Break pedal to the floor and only fronts lock up??? :confused:
HELP!
[Modified by Road Racer, 10:43 AM 10/15/2002]
HELP!
[Modified by Road Racer, 10:43 AM 10/15/2002]
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 809
Likes: 0
From: Derry NH
Re: Front breaks lock up, back ones don't? ('79ProwlerOrange)
do you get a firm pedal after a while of non-driving? do you see any leaks? sounds like a hose or o-ring to me.
Burning Brakes
Joined: Mar 2001
Posts: 1,211
Likes: 5
From: Nashville TN
Re: Front breaks lock up, back ones don't? (Road Racer)
I would flush your system out with some el cheapo do 3 fluid and replace it with this :
Ate Super Blue Racing Brake Fluid
Perfect for high performance street and club racing. Exceeds specifications of FMVSS No. 116 DOT 4/DOT 3, SAE J1703 and ISO 4925. Suitable for all brake and clutch systems rated for DOT brake fluids. Also suitable for ABS. Mixes with brake fluids that have the same specifications. Dry boiling point is 280°C/536°F and wet boiling point is 200°C/392°F.
You can buy it from this supplier:
http://www.bmaautoparts.com/
Ate Super Blue Racing Brake Fluid
Perfect for high performance street and club racing. Exceeds specifications of FMVSS No. 116 DOT 4/DOT 3, SAE J1703 and ISO 4925. Suitable for all brake and clutch systems rated for DOT brake fluids. Also suitable for ABS. Mixes with brake fluids that have the same specifications. Dry boiling point is 280°C/536°F and wet boiling point is 200°C/392°F.
You can buy it from this supplier:
http://www.bmaautoparts.com/
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 809
Likes: 0
From: Derry NH
Re: Front breaks lock up, back ones don't? (dman535)
I would flush your system out with some el cheapo do 3 fluid and replace it with this :
Ate Super Blue Racing Brake Fluid
Perfect for high performance street and club racing. Exceeds specifications of FMVSS No. 116 DOT 4/DOT 3, SAE J1703 and ISO 4925. Suitable for all brake and clutch systems rated for DOT brake fluids. Also suitable for ABS. Mixes with brake fluids that have the same specifications. Dry boiling point is 280°C/536°F and wet boiling point is 200°C/392°F.
You can buy it from this supplier:
http://www.bmaautoparts.com/
Ate Super Blue Racing Brake Fluid
Perfect for high performance street and club racing. Exceeds specifications of FMVSS No. 116 DOT 4/DOT 3, SAE J1703 and ISO 4925. Suitable for all brake and clutch systems rated for DOT brake fluids. Also suitable for ABS. Mixes with brake fluids that have the same specifications. Dry boiling point is 280°C/536°F and wet boiling point is 200°C/392°F.
You can buy it from this supplier:
http://www.bmaautoparts.com/
I put in fresh Valvoline Synthetic fluid. I don't know if brand of fluid would be causing my problem. :(
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 809
Likes: 0
From: Derry NH
Re: Front breaks lock up, back ones don't? (Road Racer)
I just bought both rear break calipers at autozone for $54.00 each. I'm going to install them tomorrow. I hope that cures my problem. :hat
:flag
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Safety Car
Joined: Feb 2002
Posts: 3,556
Likes: 0
From: Seattle WA
Re: Front breaks lock up, back ones don't? (Road Racer)
uh-oh... not auto zone...
i dont like thier products. they usually break before thier time. at least in my experience. i got my calipers from VB&P and i like em. then again i havent put more than 1500 miles on em so who knows? :cheers:
i dont like thier products. they usually break before thier time. at least in my experience. i got my calipers from VB&P and i like em. then again i havent put more than 1500 miles on em so who knows? :cheers: