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Old 23 Jan 2008, 07:01 pm
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Default HELP!! No brake pressure on 92' Accord?

two weeks ago the brake pressure went out on my car when i bled the brakes no fluid would come out of the valves except the front left the others it would just trickle out but there was fluid in the resevoir. I was told the master cylinder was bad so my cousin took it out and said it had black gunk in the bottom of it he cleaned it out and put it back in. I watched him as he did this he was pressing the piston and fluid would squirt out so he told me that it was still good. Two weeks later the pressure goes out again the fluid is still at a good level but i have to floor the brake to stop. after 2 days of having no pressure at all im driving and all of a sudden the pressure comes back and the car seems to be braking fine. One other thing, the left front wheel was making a bad grinding sound when the car was coasting . I took it to the shop and they said the caliper would not release and it had to be replaced but when i left it stopped grinding and hasnt done that since. any suggestion
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Old 23 Jan 2008, 07:16 pm
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Join Date: Aug 2007
Posts: 1,338

Just because your cousin was able to push fluid through the master cylinder by moving the piston doesn't mean that primary and secondary seals around the piston inside the master cylinder are not being bypassed under pressure. Under pressure in a sealed system the fluid that you are trying to push forward and out of the master cyliner to work the brakes is actually pushed back around the seals inside the master cylinder because the seals inside the master cylinder are the path of least resistance for the fluid. Simply put, it takes less hydraulic pressure to overcome the resistance to the piston seals than it does to work the pistons in the brake calipers so the seals give first and your pedal drops along with the brake pressure.I don't know where you live so I can't speak as to why your brake caliper was hung up. It is usually caused by rust on the slides that don't allow the caliper to move freely. Its not a hydraulic issue.replace your master cylinder and make sure that the master cylinder is bled before bleeding the rest of the system. I'm sure you'll find that the master cylinder is the cause of your problem.
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