Troubleshooting guide

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Typical Coach Bus Air System Schematic

PP-DC

Control Valve

Rear Axle

Module (RAM)

with R-14

Relay Valve

BA-922

Air Compressor

EC-60

™

Electronic

Controller

Premium

Low Pressure

Indicator

ASA-5

Automatic

Slack Adjuster and

Service Chamber

Stop Light

Switch

ASA-5

Automatic

Slack Adjuster and

Spring Brake Chamber

AD-IS

Extended Purge

Air Dryer

To Accessories

BVA-85

™

Door Interlock Valve

with Contol Module

Front Reservoir

Rear Reservoir

SR-7

Spring Brake

Modulating

Valve

Traction

Solenoid

Dual

Brake Valve

Front Axle

Module (FAM)

with Quick Release

Valve

Antilock

Modulator

(4 Places)

Notes:

The color coding of the brake system schematic follows APTA Recommended Practice.

Air disc & drum brake actuation combined on a single axle are shown for pictorial purposes only.

COACH:

Primary & Supply Secondary Parking Compressor Governor Accessories

For more information, visit www.bendix.com or www.foundationbrakes.com • 1-800-AIR-BRAKE (1-800-247-2725)

System Schematic