Each caliper piston had overspray from someone painting the Grand Sport black calipers RED! So before any rebuild, I took a 3M pad and gently rubbed off the overspray.
Inspect the pistons and bores for abnormal wear or damage. If either exists, time to buy new calipers.
Piston-to-bore tolerances are critical for safe brake performance. If pressurized fluid gets past the piston, stopping power is greatly reduced – so be safe.
After removing the old bore seal with a pick (careful not to score the inside of the bore!), the new seal is installed (above left). Use caliper lube that comes with the kit to coat the bore and rubber seal.
Start the seal on one side of the groove and work it around until it seats itself in the groove and MAKE SURE THE SEAL IS NOT TWISTED IN THE GROOVE.
After the seal is seated correctly, generously lubricate the inside of the bore and the piston (above right).
The next page continues our C4 front brake rebuild on the 1957 Corvette RestoMod.
All parts have either been painted or replaced. New piston bore seals and piston boots are replaced on this page. The next page is the assembly of the caliper and associated parts.