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Old June 23rd, 2009, 08:55 AM   #1
Silver Bullet
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Default 94 Intrepid brake issue

When car is off 1 pump of brakes and the pedal is solid. When the are is running the brakes go to approx 1" from the floor before any resistance. I drove the car last night a had no issues. No visable leaks or low fluid. ABS and traction control lights are on due to wrong part on passanger rear wheel (no tone gear).

Any ideas.
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Old June 23rd, 2009, 09:03 AM   #2
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When the car is running you're getting the power boost, so it will go down just about to the floor.

Drive it. If it stops and continue to stops harder to when you're pressing the brake as far as it can go, I would say there is no issue. If it is going down and not stopping any harder, and the calipers are not leaking, it's a possible master cylinder.
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Old June 23rd, 2009, 09:25 AM   #3
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There is almost no braking power. I had to drive the few miles to work really laid back down shifting letting the trans do the braking.
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Old June 23rd, 2009, 09:26 AM   #4
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could it be a vacuum leak somewhere.
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Old June 23rd, 2009, 09:29 AM   #5
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Your emergency brake work?

See if you can go somewhere deserted and let it roll down a slight hill. See if it stops with the engine off. If it doesn't, it's a leak somewhere (master cylinder, caliper, etc.). If it won't stop with the engine off, it's vacuum related. How to pinpoint it from there I'm not sure. Could just be a leaking vacuum booster.
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Old June 23rd, 2009, 09:50 AM   #6
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emergency brake does work.
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Old June 23rd, 2009, 11:25 AM   #7
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if the brake booster was bad the pedal would be hard to push on with it running. sounds like the master cylinder might have dirt in it causing the compensating port inside to get stuck in the open position letting brake pressure escape back to the reservoir. i would flush all the brake fluid out of the car and see if that helps. brake fluid is one of those things no one changes. i always flush a brake system every 2 years.
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Old June 23rd, 2009, 11:37 AM   #8
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internal leak on the master cyclinder. if you pump it up while its driving does it get firm and then slowly go down w/ firm pressure on the pedal?
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Old June 23rd, 2009, 11:55 AM   #9
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pumping while running changes nothing.
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Old June 23rd, 2009, 08:30 PM   #10
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tonight i looked over everything again and no leaks all vacuum lines connected. I checked the fluid and all is good. When I got back in the brakes worked perfect again.

The only thing I can think of is the cap seal but I am not sure if that would cause that big of a problem.
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