Bendix Commercial Vehicle Systems EVERSURE SPRING BRAKE - Manual (Page 8)

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11.3.2 If the service replacement is a type that provides
an extra-long threaded push rod, thread a nut onto the rod
past the point that it will need to be cut. Taking all necessary
safety precautions, cut the rod to the required length and
remove burrs. Remove the nut installed earlier to ensure
that the threads are clear.
11.3.3 Install the combination spring brake using
the furnished hardware. Torque the mounting nuts to
133-155 ft/lbs. (80-210 Nm) Connect the yoke to the slack
adjuster and install the yoke pin and the cotter pin.
11.3.4 Connect the air hoses to brake chamber. Torque
the fi tting to 30 ft-lbs (40 + 5 Nm). Check to be sure the air
hoses are properly supported and clamped, if necessary,
to provide proper clearance, including checking for proper
length when under full steer conditions.
11.3.5 Pressurize the service chamber by putting air into
the service port. Do not exceed 120 psig.
11.3.6 Test for leakage (see Section 4.2). Minimal
leakage is permitted (100 SCCM).
11.3.7 Uncage the main spring and return the release
tool into the release tool side pocket (see Section 10).
11.3.8 Adjust the slack adjuster per manufacturer’s
recommendations.
11.3.9 Check the function and stroke (Section 4.1).
11.3.10 Replace the dust cap in the keyhole.
WARNING
Check for proper service and emergency operation after
servicing any part of the brake chamber(s). Check the
brake adjustment if the combination spring brake was
removed/installed. (Follow the vehicle manufacturer’s
instructions to adjust the brakes).
12.0 REPLACING THE SERVICE DIAPHRAGM
See Figure 8. To replace the service diaphragm, it is not
necessary to remove the complete combination spring
brake from the vehicle (however, it can be removed for
ease of access). To remove the combination spring brake,
perform the steps outlined in Step 11.0 Removal and
Installation of the Combination Spring Brake.
When either the diaphragm, spring, or both, are replaced, they
should be replaced in the corresponding chamber on the same
axle. Use only genuine Bendix
® brand replacement parts.
WARNING
A spring brake chamber cannot have the emergency
diaphragm replaced. Replace the whole spring brake
chamber.
12.0.1 Protect the service push rod with tape, and lock
the locking pliers on the push rod close to the non-pressure
plate. (This will hold the rod in the applied position).
12.0.2 Ensure that the spring brake chamber is caged. To
cage the spring brake chamber, perform the steps outlined
in either Step 6.0 Mechanical Release (Caging) of the
Bendix
® EverSure ® Spring Brake or Step 8.0 Mechanical
Release (Caging) and Removal of the Piggyback Spring
Brake Chamber to be Replaced.
12.0.3 Mark the service clamp ring and non-pressure
plate to ensure proper alignment of par ts during
reassembly.
12.0.4 Remove the service clamp ring assembly and
the chamber. The service clamp ring is closest to the
non-pressure plate and slack adjuster. See provided
illustrations if in doubt.
12.0.5 Install new diaphragm.
12.0.6 Line up the spring brake chamber, the service
diaphragm, and the non-pressure housing, ensuring that
they are centered (see Figure 5).
12.0.7 Re-assemble the service clamp assembly.
Ensure all parts are seated properly and remain centered.
12.0.8 Torque the clamp nuts to 20-30 ft/lbs. Remove
the locking pliers from the service push rod.
12.0.9 Reconnect the emergency air hose to the
emergency port (marked “12”) and reconnect the service
air line to the service port (marked “11”).
12.0.10 Pressurize the service half by putting air into the
service port. Perform the Leakage Test (Section 4.2).
12.0.11 Per for m the Functional Test and Stroke
(Section 4.1).
12.0.12 Uncage the main spring and return the release
tool into the release tool side pocket (See Section 10).
12.0.13 Replace the dust cap in the keyhole.
WARNING
Check for proper service and emergency operation after
servicing any part of the brake chamber(s). Check the
brake adjustment if the combination spring brake was
removed/installed. (Follow the vehicle manufacturer’s
instructions to adjust the brakes).
BW7506 © 2011 Bendix Commercial Vehicle Systems LLC. 08/11. All Rights Reserved. Printed in the United States.