Troubleshooting guide

15
www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)
E-10PR
™
Brake
Valve
Miscellaneous Charging System Related Components
the vehicle comes to a stop. When the driver removes
all force from the brake valve the internal return springs
move back to their original position and allow air in
the valve and delivery lines to vent to atmosphere
through the exhaust port.
The Bendix
®
E-6
™
, E-8P
™
, E-10
™
, E-10P
™
, E-12
™
and
E-15
™
dual brake valves are typically floor mounted
and treadle operated, while the Bendix
®
E-7
™
and E-14
™
dual brake valves are bulkhead mounted, suspended
pedal valves.
Section 3: The Control System
• Vehicle parking using push-pull hand operated
valves and spring brakes,
• Anti-compounding system design to prevent both
the service brakes and the parking brakes being
applied at the same time, and
• Proportioning valves to adjust braking when a
tractor is not pulling a trailer
The control system typically consists of:
• A foot brake valve and often an additional hand-
operated trailer brake control valve
• Brake actuators or rotochambers, to change
the applied air pressure into a push-rod force
which
operates the foundation brakes (air disc, S-Cam, etc.)
• Quick release valves to assist in releasing the
brakes quickly
See the inside front cover for a sample system schematic. The primary (rear) brake circuit
is shown in green and the secondary (front) brake circuit is shown in orange.
E-6
™
Brake
Valve
Note: Brake valve
replacements are
typically ordered
without the foot pedal
components. For illustration,
full assemblies are shown here.
Dual Circuit Brake Valves
Dual Circuit Brake Valves
When the driver applies the service brakes using the
brake pedal/treadle, a two-part plunger within the brake
valve moves, closing the valve’s exhaust and opening
passages within the valve that allow the air pressure
waiting there to pass through and be delivered to the
rear and front brake systems. The pressure quickly
increases in the brake chambers and applies force to
the push rod, transferring the force to the S-Cam or
air disc brake. Frictional forces slow the wheels and
E-10
™
Brake
Valve
E-7
™
Brake
Valve
E-12
™
E-15
™
Brake
Valves
E-10P
™
Brake
Valve
E-8P
™
Brake
Valve
E-14
™
Brake
Valve