1995 850 soft brake pedal after bleeding

Tacitus · Post by **Tacitus** » 19 May 2014, 12:22

Hi guys,

I have a 1995 850 with a soft brake pedal. I replaced the master cylinder and thoroughly bled the brakes. I am getting no air out of any of the bleeders, just nice solid streams of fluid. The pedal gives a little resistance, but eventually sinks all the way down to the floor. Is there any other component on these 850's that will cause a sinking pedal with no fluid loss other than a master cylinder? Could it be the ABS modulator? Thanks for your help!

Post by **rmmagow** » 19 May 2014, 13:05

Do you think you might have some bad flex lines? It's possible fluid is leaking internally. Have someone hold the brake and see if the flex line has a bulge in it.

Post by **kahl** » 19 May 2014, 13:47

was the master cylinder bleed? If so your master cylinder is defective or one of the lines at the master cylinder may not be seated. just a little air in the system would cause your described problem.

Tacitus · Post by **Tacitus** » 19 May 2014, 14:09

I did bench bleed the master cylinder and all the air seemed to purge out fine.

One thing I did notice when I was bleeding the calipers: the streams of fluid coming out of the screws were solid but very weak. Usually when I have my helper depress the pedal the fluid comes blasting out of the screw, enough to squirt to the other side of the car if I remove the hose; not so with this car. That makes me think fluid is pushing past the master cylinder o-rings. I have a new master cylinder on the way so we will see how that goes.