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Answered 2008-07-07 07:42:09

The primary cup seal on the primary piston in your master cylinder is bad. this results in to little pressure and a leak inside the master cylinder, causing the pedal to slowly drop to the floor. change your master cylinder and fix your problem. for any questions

On my 91 Integra LS, it meant that i needed to bleed the brakes, and be sure that you get all or as much air as possible out of them, then make sure that there is enough brake fluid. Try this. It should work, if not then there might be a leak in the lines or maybe even more serious problems. Benjamin Nichols Baldwin, WI Could Be the master cylinder. ON MY 95 INTEGRA WE HAD BLED THE BRAKES EVERY COUPLE OF DAYS AND FINALLY SOMEONE SUGGESTED WE REPLACE THE MASTER CYLINDER AND THAT FIXED THE PROBLEM. If you lose pressure after you press the brake and have to pump the pedal to regain pressure, it is your master cylinder. More than likely it is an internal O ring that is failing. It is easy to replace the master cylinder. It has 2 fuel lines and 2 bolts hold it to the DS firewall. Be sure to bleed the new master cylinder prior to re-installing the fuel lines, this will eliminate the need to bleed each brake line individually. I just did it and it only took about 1 hr.

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