Front
All hydraulic foundation brakes are disc brake type.
The front and rear disc brake assembly consists of the following components:
| • | The brake rotor with a hub, or with a wheel |
| • | The brake caliper mounting plate |
The brake rotor is bolted to the front hub or wheel. The rotor turns with the
tire and wheel assembly. The brake caliper housing has machined bores and pistons.
A seal in a groove of the wall in each bore provides a hydraulic seal and retracts
the piston when fluid pressure is relieved. A dust boot keeps the piston bore clean.
On Dayton-Walther a metal heat shield protects the dust boot from the heat caused
by braking friction. The brake caliper is mounted by a brake caliper retainer and
the brake caliper retainer spring to the stationary brake caliper mounting plate.
The brake caliper mounting plate and the brake shield are bolted to the steering knuckle.
The brake pad assemblies are held in place on each side of the brake rotor.
The outer brake pad moves with the brake caliper housing. Depending on axle size,
the inner brake pad is held in place by either the brake caliper mounting plate or
the brake caliper housing. All original equipment brake pad linings are asbestos free.
Applying the brake pedal causes hydraulic pressure to move the brake caliper
pistons. This causes the brake pads to clamp the brake rotor. The brake caliper adjusts
its clamping position by sliding laterally in the support rails on the brake caliper
mounting plate.
Releasing the brake pedal relieves the pressure applied to the brake caliper
pistons. The pistons are pulled back in the bore by the action of the square cut piston
seals returning to their original shape. This allows for a running clearance between
the brake pad linings and the brake rotor.
All hydraulic foundation brakes are disc brake type.
The front and rear disc brake assembly consists of the following components:
| • | The brake rotor with a hub, and wheel |
| • | The brake caliper mounting plate |
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 seal in a groove of the wall in each bore provides a hydraulic seal and retracts
the piston when fluid pressure is relieved. A dust boot keeps the piston bore clean.
On Dayton-Walther a metal heat shield protects the dust boot from the heat caused
by braking friction. The brake caliper is mounted by a brake caliper retainer and
the brake caliper retainer spring to the stationary brake caliper mounting plate.
The brake caliper mounting plate and the brake shield is bolted to the steering knuckle.
The brake pad assemblies are held in place on each side of the brake rotor.
The outer brake pad moves with the brake caliper housing. Depending on axle size,
the inner brake pad is held in place by either the brake caliper mounting plate or
the brake caliper housing. All original equipment brake pad linings are asbestos free.
Applying the brake pedal causes hydraulic pressure to move the brake caliper
pistons. This causes the brake pads to clamp the brake rotor. The brake caliper adjusts
its clamping position by sliding laterally in the support rails on the brake caliper
mounting plate.
Releasing the brake pedal relieves the pressure applied to the brake caliper
pistons. The pistons are pulled back in the bore by the action of the square cut piston
seals returning to their original shape. This allows for a running clearance between
the brake pad linings and the brake rotor.
Servicing Information
| • | Pump the brake pedal several times in order to make sure it is firm prior
to moving the vehicle. Do not move the vehicle until you obtain a firm pedal. Check
the brake fluid level in the master cylinder after pumping the brakes. |
| • | Replace all components included in the repair kits. |
| • | Lubricate the rubber parts with clean brake fluid in order to ease assembly. |
| • | Do not use lubricated compressed air on the brake parts. Compressed air
can damage the rubber components. |
| • | Flush the hydraulic brake system with clean brake fluid when you install
new brake parts. |
| • | If necessary, bleed all or part of the brake system after any hydraulic
component has been removed or disconnected. |
Brake Rotor
The disc brake rotor is bolted to the hub assembly. 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 a
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.
Brake Caliper
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 4 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.
