Disc Brake System: Description and Operation

System Component Description
The disc brake system consists of the following components:

Disc Brake Pads: Applies mechanical output force from the hydraulic brake calipers to friction surfaces of brake rotors.

Disc Brake Rotors: Uses mechanical output force applied to friction surfaces from the disc brake pads to slow speed of tire and wheel assembly rotation.

Disc Brake Pad Hardware: Secures disc brake pads firmly in proper relationship to the hydraulic brake calipers; enables a sliding motion of brake pads when mechanical output force is applied.

Disc Brake Caliper Hardware: Provides mounting for hydraulic brake caliper and secures the caliper firmly in proper relationship to caliper bracket. Enables a sliding motion of the brake caliper to the brake pads when mechanical output force is applied.

System Operation
Mechanical output force is applied from the hydraulic brake caliper pistons to the inner brake pads. As the pistons press the inner brake pads outward, the caliper housings draw the outer brake pads inward. This allows the output force to be equally distributed. The brake pads apply the output force to the friction surfaces on both sides of the brake rotors, which slows the rotation of the tire and wheel assemblies. The correct function of both the brake pad and brake caliper hardware is essential for even distribution of braking force.

Important: Do NOT refinish the brake rotors order to correct any of the following complaints:
^ Growl or squeal brake noise
^ Premature brake lining wear
^ Cosmetic or superficial corrosion of the rotor braking surface
^ Rotor discoloration

Refinish the brake rotors ONLY when one or more of the following conditions exist:
^ Groove depth in excess of specification
^ Severe scoring of the rotor braking surface
^ Brake pulsation caused by the following
- Lateral runout in excess of specification
- Brake rotor thickness variation in excess of specification
- Corrosion or pitting that is deeper than the rotor braking surface

1. Use the J 42450-A in order to clean the wheel bearing/hub.
2. Use a micrometer in order to measure the thinnest point of the brake rotor. If the thinnest point of the brake rotor exceeds the brake rotor minimum thickness, do NOT refinish the brake rotor. Replace the brake rotor.