Brake Master Cylinder Lid Leaking

On several occasions like yours, I found the brake system to have air in it, and when the brake pedal is released, the compressed air forces fluid back to the reservoir, and there is a violent fountain of fluid shoots up against the cap, and some migrates under the cap. I know some that should know better will disagree, but that has been my experience, and bleeding the air out of the system cured the issue, not a new seal, top, or M/C.


Want to check it, have a friend pump the brakes a few times and hold the pedal down, THEN remove the cap and have the pedal released, if you get a prolonged fountain of fluid squirting back into the M/C, then you need to stop the fluid return, by adjusting brakes, and bleeding.. jmo


PS, have plenty of water nearby, to immediately rinse any spilled fluid off the paint, as brake fluid is excellent paint remover.


hope it helps