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Why master cylinder keeps going out.

(1990 Chevrolet 2500 Pickup)
in Silsbee, TX on September 26, 2014
This is a 1985 Chevy 2500 pickup. I have put two master cylinders on and am about to put a third in three years. They all keep losing fluid from the back reservoir and leaking it into the brake booster. This truck gets driven very little, usually only about six months out of the year and then usually just short trips locally. what is causing these master cylinders to be going out so often?
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Displaying 2 answers & 8 comments
Popular Answer
on September 26, 2014
Seal between the booster and master cylinder missing or damaged? Where are the parts being purchased??
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on September 26, 2014
These master cylinders are from O'reilly auto parts.
on September 26, 2014
And the answer to my other question...,,?
on September 26, 2014
Are you knocking O'reilly.
on September 26, 2014
Nope... Just trying to help 'you' out!... Just need to know if the seal is there!!
on September 26, 2014
I haven't pulled this one yet. I am just expecting it to be leaking between the m/c and the booster because there is no leaks under the truck and the rear reservoir is dry.
on September 26, 2014
See answer #2...
on September 26, 2014
Have the rear drums actually been pulled and the wheel cylinders inspected?
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on September 28, 2014
The rear wheel cylinders were replaced last year.
on September 28, 2014
THAT was last year ! What about NOW.....We ARE trying to help...........
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