I have a '67 Triumph TR4A IRS that I have raced a few times in the =
Pacific Northwest (I'm now living in Nova Scotia where cars rot before =
they become vintage-eligible). While racing, I encountered an unusual =
braking problem after taking high-speed corners - that is I'd have no =
brakes upon first pedal depression. After one pump, the pedal would =
return until I took another high-speed corner, and then the problem =
would repeat itself. Needless to say, this was a little disconcerting, =
as it had quite a negative effect on my lap times (didn't do much for my =
confidence either!). I've tried different fluids, checked the slave =
cylinders, checked the master (single), etc, etc. but nothing seems to =
help. I do have the rear shoes adjusted out 2 1/2 notches rather than =
the "street" setting of 1 1/2 but I received this recommendation out of =
the factory competition prep manual. I noticed that on some of the =
older TR4's, there was a inline valve that kept some residual pressure =
in the rear brake line so that the shoes wouldn't recede too far from =
the drum. This unit isn't available anymore and I'm at a loss for a =
cure. I'm looking at going to dual cylinders for the added safety =
benefits but I'm not convinced this will cure my particular problem. =
Any ideas? Also, If anyone has recommendations as to what size master =
cylinders I should be looking at for my application, I would be forever =
indebted (as if I'm not already!).
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