BENDIX DUAL RELAY VALVE Handbuch - Seite 2

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PUSH-PULL VALVE WITH

INTEGRAL DOUBLE CHEC K

BVA-85

™

DOOR

INTERLOCK

VALVE WITH

CONTROL

MODUL E

FAM

FRONT AXLE

MODUL E

FRONT

FIGURE 2 - TYPICAL ARTICULATED COACH SCHEMATIC

System Normal

With the system normal and air pressure available in all

service reservoirs, brake application pressure is transmitted

from the primary and secondary circuits of the foot brake

valve.

Application pressure is transmitted simultaneously to the

front and mid-axle brakes and to the primary and secondary

control ports of the Dual Relay Valve. The Dual Relay Valve

applies or releases the rear axle brakes in direct proportion

to the control signals received from the foot brake valve.

The brake on each axle are applied using pressure from

their dedicated respective reservoirs.

Loss of Front Axle Service Reservoir

A service application made with a loss of air in the

secondary circuit results in a no or low application of the

front axle brakes. Air pressure from the primary circuit of

the foot brake valve applies the mid-axle brakes and enters

the primary control port of the Dual Relay Valve. The Dual

Relay Valve responds to primary control and applies the

rear axle brakes. Brake release occurs when foot brake

valve pressure is removed.

Loss of Mid-Axle Service Reservoir

A service application made with a loss of air in the primary

circuit results in a no or low application of the mid-axle

brakes. Air pressure from the secondary circuit of the foot

brake valve applies the front axle brakes and enters the

secondary control port of the Dual Relay Valve. The Dual

Relay Valve responds to secondary control and applies the

rear axle brakes. Brake release occurs when foot brake

valve pressure is removed.

PP-D C

™

Secondary

Control

MID

TO ACCESSORIES

DUAL

RELAY VALVE

Primary

Control

ABS-6

WITH

TRACTION CONTROL

RA M

REAR AXLE MODULE

Loss of Rear Axle Service Reservoir

With a loss of rear axle service pressure, the front and

mid-axle brakes will be applied by the foot brake valve.

Primary and secondary control pressure is received by the

Dual Relay Valve however, a no or low application of the

rear brakes will occur due to a loss of pressure in the rear

service reservoir. Front and mid-axle brakes will release

when foot brake valve pressure is removed.

PREVENTIVE MAINTENANCE

GENERAL

Important: Preventive maintenance for the Dual Relay

Valve consists entirely of inspections and tests. The Dual

Relay Valve is not serviceable and must be replaced when

testing or inspection warrants it. Kits and replacement parts

are not available.

Because no two vehicles operate under identical

conditions, maintenance and maintenance intervals will

vary. Experience is a valuable guide in determining the best

maintenance interval for any one particular operation.

Perform the tests and inspections presented at the

prescribed intervals. If the Dual Relay Valve fails to function

as described or leakage is excessive, it must be replaced

with a genuine Bendix unit, available at any authorized

parts outlet.

Every 3 months, or 25,000 miles or 900 operating

hours:

1. Remove any accumulated contaminants and visually

inspect the exterior for excessive corrosion and

physical damage.

AD-IS EP

EXTENDED PURGE

AIR DRYER

BA-922

TWIN CYLINDER

COMPRESSO R

REAR