6
FIGURE 8 - FAILED TRAILER RESERVOIR
PRESSURE
PROTECTION
VALVE C
SPRING
BRAKE
CHAMBER
TRAILER SERVICE RESERVOIR
EXHAUST
TRAILER SERVICE
CHECK
VALVE B
SERVICE/
SPRING BRAKE
RESERVOIR
CONNECTION
SERVICE
RELAY
VALVE
TRAILER SUPPLY
FAILED TRAILER RESERVOIR (SEE FIGURE 8)
Should trailer reservoir pressure be lost, trailer service
braking is no longer available. Pressure protection valve
C will close at approximately 70 psi (minimum), retaining
air pressure in the trailer supply line.
The air held by the pressure protection valve will continue to
hold the control piston’s inlet valve open, supplying air to the
spring brakes. Thus, no automatic spring brake application
occurs. However, trailer supply line air can be used to apply
and release the trailer spring brakes repeatedly.
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A
warranty may be voided if intrusive maintenance is
performed during the warranty period.
No two vehicles operate under identical conditions, as
a result, maintenance intervals may vary. Experience is
a valuable guide in determining the best maintenance
interval for air brake system components. At a minimum, the
Bendix
®
SR-5
™
valve should be inspected every 6 months
or 1500 operating hours, whichever comes fi rst, for proper
operation. Should the SR-5
™
valve not meet the elements
of the operational tests noted in this document, further
investigation and service of the valve may be required.
SERVICE CHECKS
1. Remove any accumulated contaminants. Visually
inspect the valve’s exterior for excessive corrosion
or physical damage. Repair/replace the valve as
necessary.
2. Inspect all air lines connected to the valve for signs of
wear or physical damage. Repair/replace as necessary.
3. Test air line fi ttings for excessive leakage and tighten
or replace as necessary.
OPERATIONAL AND LEAKAGE TESTS
Check the tractor dash gauge against a gauge known to
be accurate before performing these tests. Connect the
tractor air lines to the trailer on which the SR-5
™
valve is to
be tested. Block all wheels or hold the vehicles by means
other than air brakes.
1. Install a gauge in the trailer reservoir(s). Build tractor
and trailer to full system pressure by placing the
park control valve and the trailer air supply valve in
the charge position. As system pressure reaches
approximately 75-95 psi, the trailer spring brakes
should also build up to approximately 75- 95 psi before
the reservoir(s) begin to charge.
2. When full system pressure is reached, and the spring
brakes are fully released, apply a soap solution to the
SR-5
™
valve exhaust port and the vent. A 1" bubble in
5 seconds is permissible.
(21 pages)
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