MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
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Operating Instructions<br />
Brake Components<br />
The following is a brief description of the hydraulic brake system.<br />
It is intended to supply you with general information on<br />
how the system works. For complete information see the<br />
<strong>Peterbilt</strong> Medium Duty Maintenance Manual.<br />
Anti-Lock Brake System (ABS) Modulator Valve Body:<br />
adjusts brake fluid flow between the master cylinder and the<br />
wheel calipers to avoid wheel lockup.<br />
ABS Warning Lamp: lights when the ABS controller detects<br />
wheel lock-up while driving and activates the ABS. Lights<br />
also when a fault in the ABS is detected.<br />
Brake Fluid Reservoir: stores brake fluid and offers a place<br />
to replenish when needed.<br />
Brake Master Cylinder: translates brake pedal force into<br />
hydraulic fluid pressure in the primary and secondary circuits.<br />
Brake Pedal: applies actuation force from operator’s foot to<br />
the master cylinder pistons.<br />
Using the Brake System<br />
Brake Warning Lamp: illuminates when either power steering<br />
fluid flow is interrupted or when a pressure differential is<br />
present in the primary and secondary brake fluid pressure.<br />
Either case adversely affects braking operation.<br />
Differential Switch: measures the hydraulic fluid pressure<br />
difference between the primary and secondary circuits.<br />
Electrohydraulic Pump: The Electrohydraulic (EH) pump is<br />
used as a backup boost pump. The EH pump turns on and<br />
provides fluid pressure to the hydraulic booster in the event<br />
power steering fluid stops flowing through the booster head.<br />
Front and Rear Wheel Calipers: translate hydraulic fluid<br />
pressure into force applied at each wheel-end brake rotor to<br />
retard wheel motion.<br />
Hydraulic Booster: The hydraulic booster applies additional<br />
hydraulic force from the power steering gear to the master<br />
cylinder piston when the brake pedal is applied.<br />
Parking Brake Lamp: illuminates when the parking brake is<br />
engaged (the lever is in the up position.)<br />
Parking Brake Lever: the hand lever located in the cab<br />
which engages or disengages the driveline drum brake.<br />
Model <strong>330</strong> PB1318 3/01 – 87 –
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