Reply to "#9402 Master Brake Cylinder - GT5-S"

Lui, FWIW, the Byars/GM brake master cyinder has a built-in 'residual pressure valve' under the front brake fluid reservoir. Do NOT run aftermarket r.p. valves along with this part or weird things will happen when braking. The theory is, by keeping 2 psi or so in the front calipers & lines, the pads are kept closer to the discs for faster brake response. They also cause faster wear of the pads, heat the rotors & pads a bit and somewhat slow the car's speed all due to brake drag. It is easily removed if you like- a thick black plastic washer with a small spring & ball-check.

Another thing- a manual proportioning valve in the rear brake line can be used to balance your braking system front-to-rear. I use a Kelsey-Hayes valve that was stock on older Corvettes, but there are many others sold by Jegs, Summit and elsewhere. Valuable if you've changed many things in the brake system or even increased tire sizes much. The GM booster alone is not enough of a change to warrant it, though.