* DOT 5 (Silicone) Brake Fluid is not recommended
Why go with O-Rings?
Lip seal design seals are used on 1965-1982 Corvette calipers. Lip seals have inherent problems. When they sit for a period of time they leak brake fluid. When they are used on a Corvette with out of spec rotors, spindles, loose bearings or a Corvette that is driven hard; they can actually suck air into the caliper fluid area causing a loss of brake pedal. This problem is called (by GM engineers) reverse air oscillation. Because of these problems, GM quit using lip seals in the 1982. O-Ring seals virtually eliminate all of these lip seal problems. If GM doesn't use lip seals anymore, why are you?
Calipers are still sleeved with a stainless steel sleeve and completely remanufactured using all new parts but instead of using the lip seal that come from GM these calipers utilize the O ring seals and O ring pistons. Each one is pressured tested and stamped to insure quality and comes with a limited lifetime warranty.