Master cylinder leak ????

[71scamp78]

Power disc brake car. I have a newer style aluminum housing plastic tank brake master cylinder and after driving car fluid pushes out of top of screw on caps. It was also pushing out of o.e. style one...what's the problem?

 

[69FBCuda]

Bad seals are allowing the fluid to back flush so when you push the brake peddle fluid is moving in both directions.

 

[71scamp78]

Bad seals are allowing the fluid to back flush so when you push the brake peddle fluid is moving in both directions.

Bad master cylinder seals...it did same thing on old master and new

 

[Dubob]

Do you have any areas where any of the brake components are exposed or close to sources of heat? Headers or exhaust? Could be the fluid is getting hot and expanding causing it to puke out of the reservoir.

 

[69FBCuda]

Bad master cylinder seals...it did same thing on old master and new

Did you perform a complete fluid flush as you may have something other than brake fluid. Is this a recent power swap? if yes what else is new.

 

[71scamp78]

Did you perform a complete fluid flush as you may have something other than brake fluid. Is this a recent power swap? if yes what else is new.

No and old fluid looked nasty. Factory power disc

 

[71scamp78]

Do you have any areas where any of the brake components are exposed or close to sources of heat? Headers or exhaust? Could be the fluid is getting hot and expanding causing it to puke out of the reservoir.

Fluid didn't feel hot.

 

[AJ/FormS]

check for dragging brakes.