Bendix Commercial Vehicle Systems SR-5 TRAILER SPRING BRK VALVE 4/11 - Manual (Page 7)

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8. Use only genuine Bendix ® replacement parts,
components and kits. Replacement hardware,
tubing, hose, fittings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifically for such applications and
systems.
9. Components with stripped threads or damaged
parts should be replaced rather than repaired. Do
not attempt repairs requiring machining or welding
unless specifically stated and approved by the
vehicle and component manufacturer.
10. Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
11. For vehicles with Antilock Traction Control (ATC),
the ATC function must be disabled (ATC indicator
lamp should be ON) prior to performing any vehicle
maintenance where one or more wheels on a drive
axle are lifted off the ground and moving.
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 SR-5
™
valve should be inspected every 6 months or 1500 operating
hours, whichever comes first, 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 the valve for signs of
wear or physical damage. Repair/replace as necessary.
3. Test air line fittings 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.
3. Place the trailer air supply valve in the exhaust position.
The spring brakes should apply. Disconnect the trailer
supply line and apply a soap solution to check for leaks.
A 1" bubble in 5 seconds is permissible.
4. Reconnect the trailer supply hose coupling and recharge
the trailer system. The spring brakes should release.
Shut off the engine. Open the trailer reservoir drain cock.
The tractor air system should bleed down to
approximately 70 psi. The trailer spring brakes should
remain released. After the system is stabilized, leakage
at the open drain cock should not exceed a 1" bubble in
5 seconds.
5. If the SR-5 ™ valve does not function as described; or if
leakage is excessive, repair the valve, or replace with a
genuine Bendix service replacement valve.
REMOVAL
1. Identify and mark or label all air lines and their
connections on the SR-5 ™ valve. Then disconnect the
air lines.
2. Remove the SR-5 ™ valve from the reservoir.
INSTALLATION
1. Install the SR-5 ™ valve on the reservoir.
2. Reconnect all air lines to the valve using the identification
made in REMOVAL step 1.
3. Perform OPERATIONAL AND LEAKAGE TESTS before
placing the vehicle back in service.