3
B. INSTALLING
1. Mount brake chamber to mounting bracket.
2. Install yoke (if removed) and yoke pin.
3. Check the angle formed by the centerline of the push
rod and slack adjuster. This angle should be greater
than 90° in the released position and approach 90°
at maximum readjustment stroke.
4. Connect line to chamber. Check to be sure hoses
are properly supported and clamped if necessary to
provide proper clearance.
DISASSEMBLY
Clean exterior of brake chamber and mark parts in relation
to position to each other so that it may be assembled in the
same way.
NOTE: If brake chamber is to be dismantled without
removing non-pressure plate from vehicle, slack
adjuster should be backed-off.
CLAMP RING TYPE CHAMBER
1. Pull out (or push out with air pressure) push rod and
clamp it at non-pressure plate. If using vise grip pliers,
push rod should be protected so that it will not be
damaged.
2. Remove clamp ring nuts and bolts.
3. If chamber has single clamp ring, spread the ring slightly,
just enough to slip it off the plate. Care should be used
so that clamp ring is not distorted. If chamber uses two
piece clamp ring, remove clamp rings.
4. Remove pressure plate and diaphragm.
5. Remove yoke lock nut and yoke from push rod and
release grip on push rod being careful to contain the
push plate and non-pressure plate until the return spring
load is relaxed.
6. Remove push rod assembly and spring.
7. Remove boot or o-ring (if applicable).
CLEANING AND INSPECTION
1. Clean all 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
considered serviceable with genuine Bendix replacement
parts.
ASSEMBLY
CLAMP RING TYPE CHAMBER
1. Stand push rod assembly upright on a flat surface.
2. Position return spring on push rod.
3. Install boot or o-ring on non-pressure plate (if applicable).
4. Position non-pressure plate on push rod, and press plate
down against tension of spring until plate bottoms on
flat surface. Clamp rod with vise grips (protect rod) at
the plate.
5. If installing single clamp ring, position ring over clamping
surface of non-pressure plate.
6. Check alignment marks (made before disassembly) and
position diaphragm in pressure plate and place on
nonpressure plate.
7. If installing 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 bolt and nut in clamp and tighten, tapping with a
soft faced mallet to center the clamp ring if necessary.
Release grip on push rod and install remaining bolt and
nut.
8. Install nuts and bolts evenly and only sufficiently to
eliminate leakage.
TESTING OF A REBUILT BRAKE CHAMBER
Perform tests outlined in “Operating and Leakage Tests”
section.
GENERAL SAFETY GUIDELINES
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO
AVOID
PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the
following general precautions should be
observed at all times.
1.
Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.
2.
Stop the engine and remove ignition key when
working under or around the vehicle. When
working in the engine compartment, the engine
should be shut off and the ignition key should be
removed. Where circumstances require that the
engine be in operation, EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.
3.
Do not attempt to install, remove, disassemble or
assemble a component until you have read and
thoroughly understand the recommended
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.
