Re: BTV blues...

Posted by PackardV8 On 2011/12/3 18:17:19

HH56 gives good advice on testing for fluid seepage around the cap. Most likely what is happenign is that when the brake pedal is suddenly pressed OR when a lot of pressure is on the cylinder the fluid is spurting upwards thru the compensater valve toward the top of the reservoir. This same spurt of fluid can often be seen even on conventional design master cylinders BUT ONLY when the pedal travels the first 1/16" or so.

Sounds to me like a bad compensator valve. Perform the test as HH56 has outlined above. Also note that there is a recent thread about 6 months ago indicating 3hree different compensators used by various rebuilders. IIRC only ONE of them is correct. It is easy to inspect/replace.