[427sharpe]

The way the tech describes the ease of turning the front wheel sounds like a pressure problem. If a new master didn't fix it, I would start checking each component individually to trace the problem. Hook a pressure gauge up to the master cylinder port, and have someone depress the pedal. Are you getting sufficient pressure? The Mfg will be able to give you a concise envelope of what should be acceptable. If pressure is ok, go to the next juction (probably the 'T' where the 2 front lines meet...and check EACH port for pressure loss. If the main line has a kink or restriction, it will show up here. If something has been trapped in the 't' you will find it. Then, check each side of the car at the inboard side of the brake hose. This will find a kinked or damaged hard line. Then check each brake hose....maybe one of them has collapsed internally. Finally, check for solid flow THRU the calipers and make sure that all the pistons are moving easily. Also check the BRACKETS to make sure that all attaching hardware is TIGHT and that the bracket itself is solid...if the bracket/caliper is moving too much, you will not get sufficient pressure applied to the rotor to stop the car.
I had a strange problem like this when I first began tracking my GT350...too much pressure required to slow under hard braking. In this case, it turned out to be the FIREWALL flexing! I found out thru a conversation with Walt Hane that he had the same problem with his R model, and how he fixed it. I hope the process above helps Jim fix his problem!