In order to get the most out of your Corvette braking system overhaul, it is imperative that wheel bearing end-play and rotor run-out are also brought to within factory specifications. Failure to meet these requirements may cause a "spongy" pedal sensation or complete loss of pedal control in a short time, even with new calipers installed. This condition is due to "piston knock-back" (oscillation), which causes the pistons to act as air pumps at each out of spec wheel.

Headlight Vacuum System Functional Diagrams & Components