Foundation Brake Troubleshooting Chart - BENDIX SINGLE ANCHOR PIN CAM BRAKE General Description Manual

Some brake failures result from the use of rivets which are too short, too long, or the wrong diameter. Incorrect setting of the
riveting machine may induce other types of failures. The correct length rivet must be selected for each application. A
variation in shoe table thickness may require a different length rivet.
The solid portion of the rivet should end just at the inner surface of the shoe. The hollow portion of the rivet should protrude
past the inner surface of the shoe.
The proper size rivet must be used to completely fill the rivet hole.
Brass plated steel rivets are recommended but cartridge brass rivets can be used if so desired.
The riveting machine must be adjusted so that the roll of the rivet is complete, but the rivet should not split. Always use a roll
set, never a star set, when riveting brake linings. A star set does not compress the rivet and expand it to fill the hole.
Consequently, the lining may work loose in service.
SYMPTOM
1. Degraded brake
performance.
2. Slow brake
application.
3. Slow brake release.
4. Grabbing or pulling
8

FOUNDATION BRAKE TROUBLESHOOTING CHART

CAUSE
A. Too much push rod free travel.
B. Severely glazed or worn out linings.
C. Grease or oil on linings.
D. Worn, heat checked, cracked drums.
E. Push rod length too long.
F. Air chamber in wrong position in
G. Broken or bent parts.
H. Cam flipover, drum I.D. too large.
I. Flat spots on cam or rollers.
A. Cam shaft bushings binding.
A. Binding cam shaft and bushings.
B. Weak or broken shoe return spring.
C. Flat spotted cam or rollers.
A. Grease, oil or dirt on lining.
B. Glazed linings.
C. Brake linings not a balanced set,
different friction codes, or lining brand.
D. Loose or broken linings.
E. Brake drum out-of-round.
F. Defective brake drum.
G. Clevis pin or cam shaft binding at one
or more wheels.
H. Defective slack adjuster.
I. Uneven brake adjustment (side to side) I.
J. Broken or bent parts.
K. Loose spider or drum mounting bolts.
L. Different air chamber size or slack
REMEDY
A. Adjust brakes.
B. Deglaze linings or replace.
C. Replace linings.
D. Replace part.
E. Adjust device, shorten push rod
length.
F. Reposition.
G. Replace part.
H. Replace drum.
I. Replace flat-spotted parts.
A. Clean and lubricate. Check for
seal leakage.
A. Clean and lubricate.
B. Replace part.
C. Replace flat-spotted parts.
A. Replace lining.
B. Deglaze lining or replace.
C. Replace linings.
D. Replace linings.
E. Turn, per manufacturer's
specifications.
F. Replace part.
G. Clean and lubricate.
H. Replace part.
Adjust brakes.
J. Replace part.
K. Retorque, per manufacturer's
specifications.
L. Use same size and materials on
all adjuster length (side to side).
brakes.