Danny,
Double check the bolt at the fulcrum of your pedal. My MGA clutch
worked fine for years and had short pedal engagement until one day I
started experiencing problems like you describe. When first driving
it worked fine, then I would have to double pump. It was driving me
crazy, no leaks and if air was the problem, it would show the
symptoms in the opposite order. Then I had to start triple pumping
after I drove awhile and I would push the entire piston out of the
slave cylinder. Crazy huh? As a side comment, always thought it was
interesting my A clutch throw wasn't the same feel as the B clutch.
Then one day I discovered the nut had come off the bolt and it was
hanging on by the threads and the whole pedal was about to fall off.
This was causing the short throw and erratic behavior.
When I fixed that, the clutch didn't have as short of throw and felt
like my B clutch, but a full length pump would put the piston right
out of the slave cylinder. I kept asking myself why would changing
the pedal throw make a difference. After studying the exploded
diagrams awhile, I noted that the brake master cylinder had a one way
valve in it the prevents the fluid from going back into the cylinder
and the clutch did not have the valve. I had trouble properly
adjusting my brakes ever since having the master cylinder sleeved.
I pulled master cylinder apart ( you don't need to remove it) and
sure enough, that one way valve was in the clutch side. Now my
clutch works fine and my brakes adjust without being pumped.
You also should check your brake system to ensure it is clean. When
I bought my B it had a totally new brake system and master cylinder.
The clutch slave hadn't been replaced. I started having trouble with
the clutch not disengaging and after a long drawn out process of
trouble shooting, It would work ok then not and gradually got worse.
I discovered that the clutch side of the master cylinder had a tiny
nick in the rubber cup. Grasping at straws, I started checking all
the fittings and discovered the tiny piece of rubber sitting on to
off the connector junction between the metal pipe and the connector.
The piece was too big to go on down through the hose and into the
cylinder and was blocking the flow into the master cylinder.
Undoubtedly, it had been floating in the junction causing the
occasional problem until it finally jammed in place.
Good luck!
Mike
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