Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
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USING THE BRAKE SYSTEM<br />
NOTE: Today’s diesel electronic engines have<br />
significant torque and startability power at low<br />
RPM. Combinations of engine speed and available<br />
torque may over-power the vehicle’s parking<br />
brakes.<br />
WARNING! The brake system is a critical vehicle<br />
safety system. For the safety of you and<br />
others around you, have the vehicle submitted<br />
for periodic preventive maintenance checks<br />
as well as having any suspected problems<br />
immediately checked by an Authorized Service<br />
Center. Failure to properly maintain your<br />
brake system can lead to accident, resulting<br />
in death or personal injury<br />
Brake Components<br />
The following is a brief description of the hydraulic brake<br />
system. It is intended to supply you with general information<br />
on how the system works. For complete information<br />
see the <strong>Peterbilt</strong> <strong>Medium</strong> <strong>Duty</strong> Maintenance <strong>Manual</strong>.<br />
STARTING AND OPERATING THE VEHICLE<br />
Anti-Lock Brake System (ABS) Modulator Valve Body:<br />
adjusts brake fluid flow between the master cylinder and<br />
the wheel calipers to avoid wheel lockup.<br />
ABS Warning Lamp: lights when the ABS controller<br />
detects wheel lock-up while driving and activates the ABS.<br />
Lights also when a fault in the ABS is detected.<br />
Brake Fluid Reservoir: stores brake fluid and offers a<br />
place 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<br />
to the master cylinder pistons.<br />
Brake Warning Lamp: illuminates when either power<br />
steering fluid flow is interrupted or when a pressure differential<br />
is present in the primary and secondary brake fluid<br />
pressure. Either case adversely affects braking operation.<br />
Differential Switch: measures the hydraulic fluid pressure<br />
difference between the primary and secondary circuits.<br />
– 122 – Y53-6027 <strong>Medium</strong> <strong>Duty</strong> (R05/09)