Manual

ManualsBrandsBendix Commercial Vehicle Systems ManualsEquipmentSR-5 TRAILER SPRING BRK VALVE 4/11

1. Remove the four screws (1) that secure the spring

retainer (2) to the valve body. Note that the retainer is

spring-loaded. Remove the screws while holding the

retainer against its spring load. Then slowly remove the

retainer.

2. Remove spring (3) and piston assembly (4).

3. Remove piston o-ring (5). Do not remove the retaining

ring and stem from the piston. The piston is serviced

as an assembly.

4. Note and mark the position of control piston cover (7).

Then remove the four screws (6) that secure the cover

to the body.

5. Remove cover (7) and sealing ring (8), control piston

(9), and spring (10).

6. Remove o-rings (11 & 12) from piston assembly.

7. Remove reservoir ﬁ tting (13) and o-ring (14).

8. Remove spring (15) and inlet/exhaust valve (16).

9. Remove the pipe plugs that retain the three single check

valves. Two check valves are in the body, and one is

in the cover (7).

10. Remove check valve springs (17) and rubber check

valves (18).

11. With a pair of I.D. snap ring pliers, remove the snap

ring (19) in the end of the reservoir ﬁ tting check valve

assembly. Remove spring seat (20), spring (21), and

check valve (22).

12. Remove screw (23), washer (24), and diaphragm (25)

from the exhaust port.

CLEANING AND INSPECTION

1. Inspect all parts for excessive wear or deterioration.

Inspect valve seats for nicks or burrs. Check the springs

for cracks or corrosion.

2. Inspect the bores of the valve housing for deep scufﬁ ng

or gouges.

Replace all non-metallic parts and any part not found to be

serviceable during inspection, using only genuine Bendix

replacement parts.

ASSEMBLY

Before assembling the Bendix

SR-5

™

valve, lubricate all

o-rings, o-ring grooves, piston bores, and metal-to-metal

moving surfaces with Bendix silicone lubricant BW-650-M

piece number 291126.

NOTE: When using pipe thread sealant during assembly

and installation, take particular care to not allow

the sealant to get into the valve itself. Apply the

sealant beginning with the second thread back

from the end.

1. Twist the springs (17) on each of the check valves (18).

Drop the assemblies into their respective bores in the

valve body and install the pipe plugs. Torque the plugs

to 140-170 inch pounds.

2. Place reservoir ﬁ tting (13) upright, pipe threads down.

Drop check valve (22) into place. Install check valve

spring (21), spring seat (20), and snap ring (19). Install

o-ring (14) into ﬁ tting.

3. Install inlet/exhaust valve (16) into valve body. NOTE:

The side with four protruding ears rests against the seat

in the body.

4. Place spring (15) in position on the inlet/exhaust valve.

Make sure the spring rests evenly on the four ears of

the inlet/exhaust valve and the rubber protrusion on

the valve ﬁ ts into the spring’s inner diameter.

5. Properly align the inlet/exhaust valve springboard in

the recess at the end of the reservoir port ﬁ tting (13).

Install the ﬁ tting into the valve body. Torque to 200-300

inch pounds.

6. Install o-rings (11 & 12) into their respective grooves in

the control piston (9).

7. Drop and position the spring (10) into the valve body.

8. Make sure all parts are properly aligned, and install the

control piston (9) into the valve body.

9. Install sealing ring (8) in the cover (7), and install

cover onto valve body, using the identiﬁ cation made

in DISASSEMBLY step 4. Torque screws (6) to 40-60

inch pounds.

10. Install o-ring (5) in its groove in the pressure protection

piston (4). Install the piston assembly into the valve

body.

11. Position the spring (3) and spring retainer (2) on top of

the pressure protection piston assembly, and secure it

with the four screws (1). Torque to 20-30 inch pounds.

12. Install diaphragm (25), washer (24) and screw (23) into

the exhaust port. Torque screw to 15-25 inch pounds.

NOTE: BEFORE PLACING THE VEHICLE BACK INTO

SERVICE, PERFORM “OPERATIONAL AND

LEAKAGE TESTS,” LISTED IN THIS MANUAL.