[Healeys] Brake problem

[Michael Oritt]

Yesterday while returning from a ride in the 100 I applied the brakes and
the pedal went to the floor--fortunately the emergency brake slowed me down
enough that I could negotiate the upcoming turn and come to a stop.

After a few deep breaths I stepped on the brake pedal--this time it was
normal and the brakes functioned seemingly fine. I checked the hydraulic
fluid reservoir and it was full. I was less than a mile from the garage so
returned slowly though the brakes continued to work fine and got me back.

In the garage I applied the brakes a few more times, all normal except for
one time when I held my foot on the pedal it and it went slowly to the
floor like I was pushing fluid out somewhere through a very small leak but
there were no leaks. Next push the brake pedal was high and firm. Retested
several times at 15 to 30 minute intervals--no problems, but obviously
something is wrong here!

I haven't pulled the master cylinder off and apart yet but am thinking that
the return valve is somehow hanging up. FWIW I have a BT7 discs in front
and drums in back and a single circuit setup with a valve in the rear brake
line which serves as a poor man's proportional setup.

Thoughts?

Best--Michael Oritt