BENDIX MC-12 MODULATOR CONTROLLER ASSY Guia de Resolução de Problemas descarregar pdf (Página 30)

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SR-1

™

Spring

Brake Valve

Service Relay

Valve

QR-1C

Quick

Release

Valve

PP-DC

Park

Control Valve

Park Co ntrol Valves

The PP-DC

park control double check valve is

a push-pull, manually operable on/off valve with an

integral double check. It is dashboard mounted and

provides in-cab control of truck or bus parking brakes.

Manually pushing or pulling the button will release or

apply the parking brakes. The integral double check

valve allows the PP-DC

valve to receive supply air

pressure from either, or both, the front or rear axle

service reservoirs.

The valve is pressure sensitive and automatically moves

from the applied (over the road position) to the exhaust

position (thus applying the parking brakes) if total system

pressure (both front and rear axle reservoirs) drops

below 20 to 30 psi.

Section 4: Tractor Parking, Trailer Charging/Parking and

Emergency Systems

The tractor/trailer parking and emergency system typically

consists of:

• The tractor parking control system

• The trailer parking and emergency system, and

• The tractor protection system

See the front covers of this handbook for system schematics.

PP-DC

Park

Control Valve

Tractor/Trailer Parking and Emergency Systems

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