All hydraulic foundation brakes are disc brake type. The Dayton-Walther rail slider type disc brake caliper is used on the 3 675 kg (8,100 lb) front axle. All other front axles use the Bendix® rail slider type disc brake caliper.
The front disc brake assembly consists of the following components:
The brake rotor is bolted to the front hub or wheel. The rotor turns with the tire and wheel assembly.
All hydraulic foundation brakes are disc brake type. The Dayton-Walther rail slider type disc brake caliper is used with the following rear axle capacities:
The Dayton-Walther fixed mount type disc brake caliper is used with the following rear axle capacities:
All other rear axles use the Bendix® rail slider type disc brake caliper.
The rear disc brake assembly consists of the following components:
The brake rotor is bolted to the rear hub or wheel. The rotor turns with the tire and wheel assembly.
The brake caliper housing has machined bores and pistons. A piston seal in a groove of the wall or each bore provides a hydraulic seal. The piston seal retracts the piston when hydraulic fluid pressure is relieved. A dust boot keeps the caliper bore clean. A metal heat shield protects the dust boot from the heat caused by braking friction. The rear brake caliper mounting plate and the rear brake shield are bolted to the rear axle.
The fixed type brake caliper is bolted to the brake caliper mounting plate.
A brake caliper retainer, brake caliper spring, and brake caliper retainer bolt hold the rail slider type brake caliper to the stationary brake caliper mounting plate.
The brake pads are on each side of the brake rotor. The rail slider type outer brake pad moves with the brake caliper housing. Depending on the rear axle capacity, either the brake caliper mounting plate, or the brake caliper housing, holds the rail slider type inner brake pad in place. All original equipment rear brake pads are asbestos-free.
Applying the brake pedal causes hydraulic pressure to move the pistons. The brake pads clamp the brake rotor. The rail slider type brake caliper slides laterally in the support rails on the brake caliper mounting plate, in order to adjust clamping position.
Releasing the brake pedal relieves the pressure applied to the pistons. The square cut piston seals return to the original position. The piston seal's return pulls the pistons back into the caliper bore. This allows for a running clearance between the brake pads and the rotor.
The disc brake rotor is bolted to the hub or wheel. The brake rotor turns between the brake pads, basically free-wheeling until you apply the brake pedal. Applying the brake pedal creates hydraulic pressure, which the brake caliper converts to stopping force. This force acts equally against the pistons and the bottom of the fixed-type brake caliper bore, moving the pistons outward and clamping on the brake rotor. With a rail slider-type brake caliper, the force also acts equally against the pistons and the bottom of the caliper bore sliding the caliper inward, and clamping on the brake rotor. The clamping action of either caliper type forces the brake pads against the rotor, stopping the vehicle.
The front brake caliper is a rail slider type with dual pistons. The rear brake caliper is either a dual-piston rail slider-type, or a fixed-mount-type with four pistons. A piston seal, in a groove of the wall in each machined bore, provides a hydraulic seal. The piston seal also retracts the piston when hydraulic fluid pressure is relieved. A dust boot keeps the caliper bore clean. A metal heat shield protect the dust boot from the heat caused by braking friction. A brake caliper retainer, brake caliper spring, and brake caliper retainer bolt hold the rail slider-type caliper to the brake caliper mounting plate. The fixed-mount-type rear caliper bolts directly to the brake caliper mounting plate.
