BENDIX PP-DC Manuale - Pagina 2

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FIGURE 2 - TYPICAL 4 X 2 TRUCK SCHEMATIC WITH PP-DC

If primary service reservoir pressure drops below secondary

service reservoir pressure, the double check valve reacts as

shown in Figure 4. It seals the primary service reservoir

supply port and supplies the PP-DC

secondary service reservoir. As is shown, the push-pull button

remains in and the spring brakes remain released.

PARKING BRAKES APPLIED

Figure 5 shows the PP-DC

applied position. This will occur if the driver manually pulls

out the push-pull button or if total system pressure drops to

below 20 to 30 psi.

When the button "pops out," the exhaust seal moves to

open the exhaust port to atmosphere, allowing delivery line

pressure to exhaust. The plunger o-ring moves to seal off

supply pressure. Spring brake hold-off air is exhausted

through the spring brake relay valve.

WARNING! PLEASE READ AND FOLLOW

THESE

INSTRUCTIONS

PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following

general precautions should be observed at all times.

1. Park the vehicle on a level surface, apply the

parking brakes, and always block the wheels.

Always wear safety glasses.

2. Stop the engine and remove ignition key when

working under or around the vehicle. When

working in the engine compartment, the engine

should be shut off and the ignition key should be

PP-DC

™

SUPPLY (PRIMARY

RESERVOIR)

SUPPLY (SECONDARY

RESERVOIR)

™

valve with air from the

™

valve in the parking-brakes-

AVOID

DEL.

VALVE

EXH.

™

PARK CONTROL VALVE

removed. Where circumstances require that the

engine be in operation, EXTREME CAUTION should

be used to prevent personal injury resulting from

contact with moving, rotating, leaking, heated or

electrically charged components.

3. Do not attempt to install, remove, disassemble or

assemble a component until you have read and

thoroughly understand the recommended

procedures. Use only the proper tools and observe

all precautions pertaining to use of those tools.

4. If the work is being performed on the vehicle's air

brake system, or any auxiliary pressurized air

systems, make certain to drain the air pressure from

all reservoirs before beginning ANY work on the

vehicle. If the vehicle is equipped with an AD-IS

air dryer system or a dryer reservoir module, be

sure to drain the purge reservoir.

5. Following

recommended procedures, deactivate the electrical

system in a manner that safely removes all

electrical power from the vehicle.

6. Never exceed manufacturer's recommended

pressures.

7. Never connect or disconnect a hose or line

containing pressure; it may whip. Never remove a

component or plug unless you are certain all

system pressure has been depleted.

8. Use only genuine Bendix

components and kits. Replacement hardware,

tubing, hose, fittings, etc. must be of equivalent

size, type and strength as original equipment and

be designed specifically for such applications and

systems.

SR-1

™

SPRING

BRAKE VALVE

SERVICE

RELAY VALVE

the

vehicle

manufacturer's

replacement parts,

ANTI-CMPD.

LINE

QR-1C

™

VALVE