mlarnoldTR6
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Thankyou for reading my post. I have a 1975 TR6 that I don't get to enjoy as much as I would like. I have had it out for a couple of long rides this Summer and each time after about 30-45 minutes of normal driving the brakes become soft and progressively fail. I can pump them up to get myself to a slow stop but the pedal goes all the way to the floor. After it sits for 30 minutes I can get back in and the pedal is firm again and they work for a while and the process repeats itself. I have a new master cylinder (2years old) and both resevoirs are full. The vacuum assist hose from the intake manifold is new and conected properly to the booster. There are no apparent leaks at all four corners nor in the engine compartment. The car does not pull when braking (when their working). It makes me nervous to drive of course and the problem is if I take it to a mechanic the brakes will probably work fine when he tests it. It would be helpful to have some input from experts to help guide me when I go to the mechanics. I use Castrol DOT3 fluid, the car is garaged and covered when not in use. Any thoughts would be greatly appreciated. Thanks.