The 1970 Chevrolet Nova was available with optional power front disc brakes. This option utilized single-piston floating calipers. This type of caliper has a large piston that pushes against a brake pad on the inner side of the rotor. The same pressure exerted by the piston on the inside of the rotor pulls the outer brake pad against the outside of the rotor. The only parts replaced during a rebuild are the piston seal and boot.
Tools Used: Brake parts cleaner, Small slotted screwdriver, Plastic toothpick, Clean brake fluid
Rebuild the Caliper
Thoroughly spray the outside of caliper with brake parts cleaner. Use a small slotted screwdriver to pry the piston boot out of the caliper body. The boot has a wire ring molded into it.
Pull the piston out of the caliper body. Use a plastic toothpick to lift the piston seal out of the groove in the caliper. Reach into the caliper bore and drag the piston seal out of the groove in the bore with your finger.
Check the piston bore in the caliper for excessive scoring or pitting. If the bore is badly scored or has extensive pitting you should replace the caliper. If the bore looks good, spray it with brake cleaner. Spray the piston with brake cleaner. Allow them to thoroughly dry.
Coat the piston seal with clean brake fluid. Coat the piston bore with brake fluid. Slide the piston seal into the groove in the bore making sure the seal does not get twisted
Coat the piston with clean brake fluid and slide it into the bore. When it is about half way in, slide the piston boot onto the groove in the piston. Slide the piston the rest of the way into the bore. Push the outside of the boot into the caliper body with the handle of the slotted screwdriver.
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