Service manual

Group 59 Anti-Lock Brake System (Bendix) Service Procedures

W5000534

Connect the supply line from the relay

valve to port 1 of the modulator valve.

Connect the valve electrical connector.

Build up air pressure in the vehicle’s

air system.

Release the parking brakes.

Apply normal brake pressure and ver-

ify that the air passes freely through

the ABS modulator valve and that

there are no air leaks.

ATR Valve Replacement

PERSONAL INJURY HAZARD! Before working on a

vehicle, set the parking brakes, place the transmission

in neutral, and block the wheels. Failure to do so can

result in unexpected vehicle movement and can cause

serious personal injury or death.

Removal

Park the vehicle on a level surface, ap-

ply the parking brake, and block the

wheels. Ensure the vehicle ignition is

OFF and the transmission is in neutral.

Components in any air brake system may be under

high pressure. Before disconnecting any air lines, be

sure all air pressure is released. Failure to do so may

result in the sudden, possibly explosive release of air

pressure, causing parts to strike you with consider-

able force, resulting in serious personal injury.

Bleed the air pressure from the vehi-

cle’s air brake system.

Identify and label or mark the ATR

valve air lines for proper reinstallation.

Disconnect the electrical connector

from the valve.

Disconnect the air lines from the valve.

Remove the valve mounting bolts and

nuts.

Remove the valve.

Note the orientation of the ﬁttings in

the valve, then remove the ﬁttings.