Quote:
Originally posted by Euan McDonald
Yes I do have a Jeep with dodgy brakes, I adjusted all shoes & bleed the system but still the pedal just about hits the floor on the first pump but is good on the second pump. I suspect the master is by passing inside, is there a common fix or later model conversion/upgrade? 
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Euan,
Me again! I had a customer with jeep brake problems, it had been in an accident and a garage had repaired it including fitting a new master cylinder. They bled it numerous times apparantly, with pressure bleeder and still it had long pedal travel. The owner asked me to look at it, first check was shoe adjustment, but I quickly came to the master cylinder, stripped it and found a faulty rubber valve in the end. Some of the pattern ones on the market now have valves of different design to original Wagner Lockheed. Although they do the same job, their quality is suspect.
Since then I went out to a GMC with similar troubles, valve was culprit there as well.
Richard