spongy brake pedal
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1st Gear
Joined: Feb 2006
Posts: 183
spongy brake pedal
Hi,
What would cause a spongy brake pedal. I can't even lock up the wheels (ABS is disabled) on dry pavement when I slam on the brakes going pretty quickly. When I apply the brakes hard and let go I can feel that the car doesnt roll on its own like it should, something is holding it back a bit.
I got my parking brake cables changed this week because one of them was not completely releasing and it was heating up my rear brakes.
Garage now suggest a brake flush and if that doesnt solve it its probably a stuck caliper.
What do you guys think? Try the flush?
01 Audi A4 1.8tqm 100,000miles. (new rotors and pads 10k ago)
Thanks
Mike
What would cause a spongy brake pedal. I can't even lock up the wheels (ABS is disabled) on dry pavement when I slam on the brakes going pretty quickly. When I apply the brakes hard and let go I can feel that the car doesnt roll on its own like it should, something is holding it back a bit.
I got my parking brake cables changed this week because one of them was not completely releasing and it was heating up my rear brakes.
Garage now suggest a brake flush and if that doesnt solve it its probably a stuck caliper.
What do you guys think? Try the flush?
01 Audi A4 1.8tqm 100,000miles. (new rotors and pads 10k ago)
Thanks
Mike
2nd Gear
Joined: Apr 2006
Posts: 1,122
From:
RE: spongy brake pedal
i would flush with some good fluid like motul 5.1... some stainless steel brake lines would help pedal feel but if you cant engage abs, something else is wrong..... start with the flush... have u ever flushed the fluid?
Thread Starter
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1st Gear
Joined: Feb 2006
Posts: 183
RE: spongy brake pedal
ORIGINAL: Papachristou
i would flush with some good fluid like motul 5.1... some stainless steel brake lines would help pedal feel but if you cant engage abs, something else is wrong..... start with the flush... have u ever flushed the fluid?
i would flush with some good fluid like motul 5.1... some stainless steel brake lines would help pedal feel but if you cant engage abs, something else is wrong..... start with the flush... have u ever flushed the fluid?
I have never flushed the fluid in the 2 years i have the car. (drove it 50,000km)
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Joined: Feb 2007
Posts: 9,004
From: Nor Cal
RE: spongy brake pedal
Don't try flushing it yourself, and thats probably a stupid idea un-less you previously opened up the brake lines for some reason.
Check under the master cylinder for any possible brake fluid leaks which would indicate a primary or secondary oil seal leak (you can test the seal by holding your foot on the pedal, if it sinks slowly the seal is bad) then look under the car to check for any calipers leaking fluid. If none of these problems are present then take it to the dealer to get a pressure bleed done, gravity bleeding our hydraulic systems are far from adequate. This is what the factory tool looks like and it can put a 1 or 2 bar pressure on the hydraulic system to flush it all out.
Check under the master cylinder for any possible brake fluid leaks which would indicate a primary or secondary oil seal leak (you can test the seal by holding your foot on the pedal, if it sinks slowly the seal is bad) then look under the car to check for any calipers leaking fluid. If none of these problems are present then take it to the dealer to get a pressure bleed done, gravity bleeding our hydraulic systems are far from adequate. This is what the factory tool looks like and it can put a 1 or 2 bar pressure on the hydraulic system to flush it all out.
Thread Starter
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1st Gear
Joined: Feb 2006
Posts: 183
RE: spongy brake pedal
ORIGINAL: auditech79
Don't try flushing it yourself, and thats probably a stupid idea un-less you previously opened up the brake lines for some reason.
Check under the master cylinder for any possible brake fluid leaks which would indicate a primary or secondary oil seal leak (you can test the seal by holding your foot on the pedal, if it sinks slowly the seal is bad) then look under the car to check for any calipers leaking fluid. If none of these problems are present then take it to the dealer to get a pressure bleed done, gravity bleeding our hydraulic systems are far from adequate. This is what the factory tool looks like and it can put a 1 or 2 bar pressure on the hydraulic system to flush it all out.
Don't try flushing it yourself, and thats probably a stupid idea un-less you previously opened up the brake lines for some reason.
Check under the master cylinder for any possible brake fluid leaks which would indicate a primary or secondary oil seal leak (you can test the seal by holding your foot on the pedal, if it sinks slowly the seal is bad) then look under the car to check for any calipers leaking fluid. If none of these problems are present then take it to the dealer to get a pressure bleed done, gravity bleeding our hydraulic systems are far from adequate. This is what the factory tool looks like and it can put a 1 or 2 bar pressure on the hydraulic system to flush it all out.
Thanks,
Mike
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