Thread: Power brake problem

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Okay, here is what I have. At Idle I have 19" of vacuum. The front rotors are Granada 11" with small GM calipers (78-83 Monte Carlo) Brake pads are Wagner NA7070AR. All the front brake hardware came from TSM (The Streetrod Mfg. Co.) There kit #1252.
The Rear Brakes are 1974 Corvette. Calipers and Rotors from Stainless Steel Brake. Power brake MC and Booster from ECI kit #EC-510. Residual valve 2 PSI both front and rear. Booster is a 7" and I believe the MC is Corvette that come in the kit. Proportioning valve (distribution block) is also from ECI.
I talked with ECI today and they said it sounds like the rubber hose might be collapsing that connects to the booster. I changed it out today and no change. Now they say my front brakes and MC are wrong and want to sell me a new set up for $525. They say my front calipers are to small. I need the larger GM calipers and new brackets and new GM rotors. And a new MC to go along with it. What the hell?