HEADLINER AS 9V3442 - Caterpillar

Low Pressure, Brake Inhibitor And Stop Light Switches
The low pressure switches(1) are normally closed switches. When the service brake air reservoirs are fully charged air pressure opens the switches. If a reservoir pressure falls below 415kPa(60psi) the switch will close and a warning buzzer will sound.The stop light switch(2) is a normally open switch. When the brakes are applied the switch closes and the stop lights illuminate.The brake inhibitor switch(3) prevents the suspension from levelling while the brakes are applied.Double Check Valve
DOUBLE CHECK VALVE
1. Inlet Port 2. Shuttle Valve 3. Inlet Port 4. Outlet PortAir enters the double check valve through either of the inlet ports(1) or (3). Shuttle valve(2) moves either to the left or right and allows air to flow through outlet port(4). If air is available at both inlet ports simultaneously the shuttle valve(2) will respond to and deliver air from the port containing the higher pressure.
TRACTOR DOUBLE CHECK VALVE
D44 TRAILER DOUBLE CHECK VALVE
D550 TRAILER DOUBLE CHECK VALVEQuick Release Valve
QUICK RELEASE VALVE
1. Inlet Port 2. Inlet Seat 3. Outlet Port 4. Exhaust Seat 5. Port 6. Diaphragm 7. Outlet PortAir enters the valve through inlet port(1) and forces diaphragm(6) downward, opening inlet seat(2) and closing exhaust seat(4). The air then flows through outlet ports(3) and (7) to the brake actuators. When inlet pressure is removed from port(1) due to the service brake pedal being released, pressure in the outlet ports(3) and (7) moves the diaphragm up to open exhaust seat(4) and close inlet seat(2). Air in the actuators is exhausted through port(5)
TRACTOR QUICK RELEASE VALVE
D44 TRAILER QUICK RELEASE VALVE
D550 CENTER AXLE QUICK RELEASE VALVE
D550 REAR AXLE QUICK RELEASE VALVEWheel Brake Actuating Chamber
TRACTOR BRAKE CHAMBER/MASTER CYLINDER 1. Brake Actuating Chamber2. Master Cylinder
WHEEL BRAKE ACTUATING CHAMBER
1. Inlet Port 2. Plate 3. Guide 4. Diaphragm