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Sinking Brake Pedal 900 1991

Brake pedal is sinking to the floor sometimes when stopped for a long time at a light. I'm not seeing any brake fluid on the ground and no noticed lost in the resvoir. Any suggestions where to look, or just change master cylinder, orginal
Does have ABS brakes. Front pads changed about 4 months ago.
1991 940 SE, Wagon 117,000 miles.

Thanks Joe








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Sinking Brake Pedal 900 1991

I had the same problem with my 240. Apparently it was an internal leak in the master cylinder.
New master cylinder resolved the problem








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Sinking Brake Pedal 900 1994

you can also try rebuilding (honing) your master cylinder, but if its to pitted then you'll need a new MC anyway. If your not strapped for cash I would just buy a new/rebuilt unit and replace.
Mike








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Sinking Brake Pedal 900 1991

sticking caliper slides will cause the same symptoms.








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Sinking Brake Pedal 900 1991

That's frequently indicative of a bad master cylinder, providing as you said there aren't any other leaks.
--
1992 940 wagon, 72k
make people envious; smile often.







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