Bendix Commercial Vehicle Systems BRAKE CHAMBERS User Manual

Page 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.

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