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Old 12-10-2012, 08:57 AM
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S10xGN S10xGN is offline
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No prop valve, took that out earlier. Just have banjo bolt fittings to resid valve(s), then direct to brake lines (tee in front system). The master is a "new" Cardone unit as opposed to their rebuilt offering.

According to my Excel brake calculation sheet, the stock 2.38" bore calipers with the 15/16" master at full 1 1/8" stroke, would move the caliper pistons 0.087" per side. Subbing the larger 2.75" bore calipers reduces their piston stroke to 0.065", a 25% reduction in total movement. Hence the pedal hitting the floor, as the master can no longer supply enough fluid at full stroke to sufficiently engage the pads to the rotors.

Now subbing the 1" master into the equation increases the large-bore caliper stroke to 0.074". Not back where it was originally, but now a 15% reduction in movement instead of 25%. Either the master is still unable to supply enough fluid or there is caliper deflection. I'll call Wilwood and get their input later. Hate to say it, but after all this d!cking around will prolly end up back at square one. Nice pedal and poor stopping.

And still no idea why the rear brakes appear to be a total fail... Surely with 30 PSI on the master cylinder reservoir, the rears should be showing some signs of engagement ? ? ?

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