Master Cylinder

[Larry Gamble]

Anyone changed a Master Cylinder?



Left campus this morning, brake pedal went to the floor but I got some brakes at the bottom of the pedal travel. By the time I got out of traffic, I got the Check Engine Light and the brake light is on (low fluid). I haven't read the codes yet.



Fluid is almost gone. No sign of leaks at the wheels. I refilled the reservoir, it will build pressure but it dumps and the pedal sinks to the floor. And, it's loosing a bit of fluid.



I figure I've lost a seal in the master cylinder.

 

[mookie]

If you are losing fluid, you have to find where it is going. Could be the master cylinder, caliper, wheel cylinder, brake line, brake line fitting, etc.

It doesn't evaporate, right?:supercool:

 

[Larry Gamble]

Rains have let up. Guess what, there is oil slick behind and around the Left Rear!



I think we found the problem!

 

[swshawaii]

Hmmm. If I had to guess, I'd say it's your RIGHT FRONT MASTER CYLINDER!!!



NOT!!! :banghead: LOL

 

[Larry Gamble]

Turns out the piston failed for left rear shoes. Fluid everywhere in there. Took me about 45 minutes and I've got a fresh brake fluid change and the failed part replaced.



Thank for the humor! I needed it at the time.



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