Bendix Commercial Vehicle Systems BRAKE CHAMBERS - Manual (Page 4)

4
DIAPHRAGM REPLACEMENT AND
DISASSEMBLY
Clean the exterior of the brake chamber and mark the
parts in relation to position to each other so that it may be
assembled in the same way.
NOTE: If the brake chamber is to be dismantled without
removing the non-pressure plate from the vehicle,
slack adjuster should be backed-off.
CLAMP-RING TYPE CHAMBER
1. Pull out the push rod and clamp it at the non-pressure
plate. If using vise grip pliers, the push rod should be
protected so that it will not be damaged.
2. Remove the clamp ring nuts and bolts.
3. If the chamber has a single clamp ring, spread the ring
slightly, just enough to slip it off the plate. Care should
be taken so that the clamp ring is not distorted. If the
chamber uses a two-piece clamp ring, remove the
clamp rings.
4. Remove the pressure plate and diaphragm.
5. Remove the yoke lock nut and yoke from the push rod
and release the grip on the push rod, being careful to
contain the push plate and non-pressure plate until the
return spring load is relaxed.
6. Remove the push rod assembly and spring.
7. Remove the boot (if applicable).
CLEANING AND INSPECTION
1. Clean all the metal parts in cleaning solvent, removing
all rust and scale. All diaphragm sealing surfaces
should be smooth and clean.
2. Carefully inspect all metal parts for cracks, distortion
or damage.
3. Replace all rubber parts and all other parts not
consid ered serviceable with Genuine Bendix ® brand
replacement parts.
ASSEMBLY
CLAMP-RING TYPE CHAMBER
1. Stand the push rod assembly upright on a flat surface.
2. Position the return spring on the push rod.
3. Install the boot or o-ring on the non-pressure plate (if
applicable).
4. Position the non-pressure plate on the push rod, and
press the plate down against the tension of the spring
until plate bottoms on flat surface. Clamp the rod with
vise grips (protect the rod) at the plate.
5. If installing a single clamp ring, position the ring over
the clamping surface of the non-pressure plate.
6. Check the alignment marks (made before disassembly)
and position the diaphragm in the pressure plate and
place on the non-pressure plate.
7. If installing a single clamp ring, work the clamp ring over
the clamping surface of the pressure plate and draw
the clamp lugs together (with vise grips or a similar
tool). Install the bolt and nut in the clamp and tighten,
tapping with a soft-faced mallet (to center the clamp
ring if necessary). Release the grip on the push rod
and install the remaining bolt and nut.
8. Install the nuts and bolts evenly and only sufficiently to
eliminate leakage.
TESTING A BRAKE CHAMBER AFTER
DIAPHRAGM REPLACEMENT
Perform the tests outlined in the “Operating and Leakage
Tests” section.
BW1426 © 2014 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group • 06/14 • All Rights Reserved.
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