RAM 2500 Truck 2WD V8-5.9L VIN Z (1997)
Brake Caliper: Description and Operation
OVERVIEW
The calipers are a single piston type. The calipers are free to slide laterally to allow continuous compensation for lining wear. When the brakes are
applied, fluid pressure is exerted against the caliper piston. The fluid pressure is exerted equally and in all directions. This means pressure exerted
against the caliper piston and within the caliper bore will be equal.
Fig. 2 Piston Seal Function
CALIPER PISTON SEAL FUNCTION
During brake application, the seal is deflected outward by fluid pressure and piston movement. When the brakes (and fluid pressure) are released,
the seal relaxes and retracts the piston. The amount of piston retraction is determined by brake lining wear. Generally the amount is just enough to
maintain contact between the piston and inboard brake shoe.