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intermittent spongy brake pedal[240-260/82] posted by richard g. on
Friday, 1 May 1998, at 8:01 p.m.
Yesterday while driving in the city, I put my foot on the brake pedal approaching a stop sign and the pedal went halfway to the floor before I got any response. Thinking that I had a master cylinder problem I pulled over and had a look at the reservoir and the brake fluid level was right up where it should be and no signs of leakage anywhere. I drove home with some anxiety about braking capability but the brake pedal worked just fine, very normal response. I drove the car today and again the brakes were "normal". Then, a short distance from home I put the brakes on and you guessed it; the pedal was real "spongy". Anybody out there know what gives here? Thanks in advance! Richard g.--
Re: intermittent spongy brake pedal[240-260/82] posted by Randy on
Friday, 1 May 1998, at 9:09 p.m.
>Yesterday while driving in the city, I put my foot on the brake pedal >approaching a stop sign and the pedal went halfway to the floor before I got >any response.
Try applying the brakes with a fairly good amount of pressure and hold them on for a period of time (15 - 30 seconds). Does the pedal eventually begin to head for the floor? What you describe is how I had a master cylinder begin to go bad. The next thing it did was to slowly lose pedal while I sat at traffic lights with the brakes on. It never lost any brake fluid- it was just leaking by the seals in the master cylinder.
Re: intermittent spongy brake pedal[240-260/82] posted by Steve Seekins on
Monday, 4 May 1998, at 10:04 a.m.
If you have intermittant problems with soft brake pedal, the cause is almost certainly a bad master cylinder where sometimes the seals are working, and sometimes they don't. Usually the leakage is internal, so there is no loss of fluid, although occasionally there is leakage past the rear seal into the booster. This will normally show up as leakage between the master cylinder and the booster, but sometimes it all gets sucked into the booster.
The problem will only get worse - replace the master cylinder before it dies completely!