Service Brakes (Front Wheels)

Disc brake unit consists of a rotating disc and a fixed caliper unit. Disc is mounted on front wheel hub. Caliper straddles the disc and is bolted to a support which is attached to steering knuckle. Caliper contains four pistons, two acting on each shoe, with one shoe on each side of disc. Hydraulic line connects to inboard half of caliper. Outboard half of caliper receives fluid from internal transfer passage in caliper. Some models use a metering valve in the line to the front brakes. It is usually mounted near the master cylinder. The metering valve delays application of the front brakes until the rear wheel brake shoes have had time to expand against the return springs, resulting in a more even braking action between front and rear. Corvette models may also be equipped with heavy duty disc brakes which include optional front calipers, shoes, linings and rear pressure regulator valve.