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SERVICE BRAKE (FULL AIR BRAKE) BR02–90
OVERHAUL
EN0680202H200009
! WARNING
•
ArvinMeritor Automatic Slack Adjusters (ASA's) should not need
to be manually adjusted in service. ASA's should not have to be
adjusted to correct excessive pushrod stroke. The excessive
stroke may be an indication that a problem exists with the foun-
dation brake, ASA, brake actuator or other system components.
• ArvinMeritor recommends troubleshooting the problem, replac-
ing suspect components and then confirming proper brake oper-
ation prior to returning the vehicle into service.
• In the event that a manual adjustment must be made (although
should not be a common practice), a service appointment and
full foundation brake, ASA, and other system component inspec-
tion should be conducted as soon as possible to ensure integrity
of the overall brake system.
IMPORTANT POINTS-DISASSEMBLY
1. REMOVAL
! WARNING
• To prevent serious eye injury, always wear safe eye protection
when you perform vehicle maintenance or service.
•
When you work on a spring chamber, carefully follow the service
instructions of the chamber manufacturer. Sudden release of a
compressed spring can cause serious personal injury.
• Block the wheels to prevent the vehicle from moving. Support
the vehicle with safety stands. Do not work under a vehicle sup-
ported only by jacks. Jacks can slip and fall over. Serious per-
sonal injury can result.
(1) If the brake has a spring brake, compress and lock the spring, so that
the brake is released completely. Check that no air pressure remains
in the service half of the air chamber.
(2) If it is necessary to raise the vehicle, use a jack and support the vehi-
cle with safety stands.
! WARNING
When you remove a clevis pin that has a spring, hold the spring with
pliers. The spring can disengage from the clevis with enough force to
cause serious personal injury.
(3) Remove both clevis pins.
(4) Remove a conventional pawl or disengage a pull pawl: Use a
screwdriver or equivalent tool to lift the button of a pull pawl assembly
at least 1/32-inch from the actuator.
! CAUTION
You must disengage a pull pawl or remove a conventional pawl before
rotating the manual adjusting nut, or you will damage the pawl teeth.
A damaged pawl will not allow the slack adjuster to automatically
adjust brake clearance. Replace damaged pawls before putting the
vehicle in service.