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. 

   

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.  

   

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.  

   

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.  

  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.

   

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.

   

Stroke 

 

 

 

 

Check the operating stoke per the manufacturers 

Improper stroke adjustment can cause brake failure on the

   

 

 

 

 

 

instructions. 

impacted wheel end. Improper stroke adjustment can cause the

   

 

 

 

 

 

 

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. 

   

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. 

 

the vehicle to be put out of service.

   

 

 

 

 

 

   

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.

   

Visually Check for Cracks 

 

 

 

 

Replace 

Do not turn brake drums.