Troubleshooting guide

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Typical Articulated Coach Bus

Air System Schematic

AD-IS

Extended Purge

Air Dryer

Front

Reservoir

Rear

Reservoir

PP-DC

Control Valve

BA-922

Air Compressor

Low

Pressure

Indicator

To Accessories

ASA-5

Automatic

Slack Adjuster and

Service Chamber

Stop Light

Switch

Mid Reservoir

ASA-5

Automatic

Slack Adjuster and

Spring Brake Chamber

ASA-5

Automatic

Slack Adjuster and

Spring Brake Chamber

BVA-85

™

Door Interlock

Valve with Contol

Module

Rear Axle

Module (RAM)

with R-14

Relay Valve

EC-60

™

Electronic

Controller

Premium

Traction

Solenoid

Dual

Brake Valve

R-14

Relay Valve

Multi-Relay

Valve

Front Axle

Module

(FAM)

with Quick

Release

Valve

Antilock

Modulator

(6 places)

Rear Axle

Module

(RAM)

with R-14

Relay Valve

COACH:

Primary & Supply Secondary Parking

Compressor Governor

AccessoriesArticulated Circuit

System Schematic

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.