BENDIX BW2676 Fascicule
Glad Hands/Hoses
Broken / Cracked / Worn
Replace
A worn locking tab could cause the glad hand to come loose
Condition
during operation.
Contamination
Clear contamination from glad hand. Make
Contamination in the glad hand has a direct path to the trailer
sure dummy glad hands are used when glad
relay valve. Contamination can cause loss of brakes on the trailer
hands are not connected.
as well as the potential that the brakes won’t release and will drag.
Never pour liquids such as alcohol down glad hand lines.
Never pour liquids such as alcohol down glad hand lines.
Seals
Worn or cracked glad hand seals should be
Leaking glad hand seals can cause the compressor to run
replaced.
excessively, resulting in a reduction of its service life.
Valves/Air Lines
Broken or Loose Mounting
Replace
Components
Excessive Oil at Exhaust
Though some oil and water is normal at the exhaust
Poor maintenance will cause premature valve failure and possible
Port
port, excessive oil and water are an indication of poor
freeze up. A loss of system brakes or slow brake release are
air dryer/compressor maintenance. It will be necessary possible.
to run an oil passing test such as the Bendix
®
BASIC
™
test. The test requires that the vehicle be re-tested
at a later date.
(See Symptom 4.0)
Broken or Loose Fittings
Replace
Use DOT air brake fi ttings. Never use regular pipe fi ttings.
Replacing fi ttings with non-genuine fi ttings (other than those for
specifi ed by the vehicle manufacturer) can cause brake imbalance.
Replacing fi ttings with non-genuine fi ttings (other than those for
specifi ed by the vehicle manufacturer) can cause brake imbalance.
Air Line Condition
Worn or cut air lines must always be replaced.
Always use the same size and type. Replacing air lines with non-
genuine lines (lines other than those for specifi ed by the vehicle
manufacturer) can cause brake imbalance.
genuine lines (lines other than those for specifi ed by the vehicle
manufacturer) can cause brake imbalance.
Brake Chambers
Broken or Loose Mounting
Replace
Components
Size
The brake chamber size should match across
Incorrect brake chamber size can cause unstable braking. Normally,
an axle.
if one brake chamber fails, the opposite brake on the same axle
will fail shortly thereafter.
will fail shortly thereafter.
Push Rod Rubbing on
Push rods rubbing on the housing are an indication that Rubbing push rods can weaken and fail, or bind and bend, causing
Housing
the rod is not cut to the proper size. Another cause
dragging brakes or brake failure on that wheel end.
could be that the brake chamber is not aligned with
the slack adjuster.
Bent Push Rod
Bent push rods are an indication that a) the brake
Bent push rods or in-operable slack adjusters will cause brake
chamber push rod is not cut to size properly; or b) that dragging or brake failure on the impacted wheel end.
the slack adjuster is not functioning properly.
Slack Adjusters
Broken or Loose Mounting
Replace
Components
Size
Slack adjusters must be the same size across an axle.
Incorrect slack adjuster size can drastically change brake torque on
Slacks are measured from the center of the yoke to the the affected wheel end. Incorrect slack adjuster size can cause the
center of the S-Cam.
vehicle to be put in an out of service condition upon inspection.
Type
Slack adjusters must be the identical model and
Some slack adjusters function on each brake application, while others
manufacturer across an axle.
adjust on each brake application. Never mix manufacturers across
an axle.
an axle.
Stroke
Check the operating stoke per the manufacturers
Improper stroke adjustment can cause brake failure on the
instructions.
(North American Standard Vehicle Out of
impacted wheel end. Improper stroke adjustment can cause the
Service Criteria)
vehicle to be put in an out of service condition upon inspection.
Brake Lining
Ensure the Lining is in Place
Visually check the foundation brake, looking
Broken parts and missing lining block may cause brake failure on the
for broken parts and missing lining block.
affected wheel end. Broken parts and missing lining block can cause
the vehicle to be put in an out of service condition during inspection.
the vehicle to be put in an out of service condition during inspection.
Cracked, loose or missing
Visually check for cracks or voids on the edge of the
Cracked or missing lining block may cause brake failure on the
Lining
lining. Check for segments that are missing and the rivet affected wheel end. Cracked or missing lining block may cause
or bolt is exposed.
(See North American Standard
the vehicle to be put out of service.
Vehicle Out of Service Criteria)
Worn to Wear Indicator
Most lining blocks are manufactured with a wear
Excessive worn brake lining may cause brake failure. Excessive
indicator. If the wear indicator is not present, use the
worn linings can cause the vehicle to be put in an out of service
Bendix
®
Brake Lining Wear Gauge BW7261
condition upon inspection.
Leaking Wheel Seals
If the leaking wheel seal has allowed oil to leak onto the Oil soaked block will reduce brake torque, causing brake
lining block, the block should be replaced on both axle ends. imbalance.
Drums and Rotors
Visually Check for Cracks
Replace
Do not turn brake drums.