BENDIX BW7249 User Manual

89

The old style cam has been discontinued for all new production 12 1/4" brake assemblies. Effective August,
1994, only new-style cams are available for service.

Please note the following guidelines when using the new-style S-cam in service:

This design change affects only the S-cam and rollers.  The use of the new-style S-cam requires the use of a
1.50" diameter roller.  Check to be sure the roller being used is the proper diameter.

NOTICE: The new S-cam should NOT be used in conjunction with an old-style S-cam on the same trailer axle.
New-style S-cams MUST be used in both sets of brake assemblies on the trailer axle.  The rate of brake applica-
tion is different from the old-style and new-style S-cams.  If the two styles of S-cams are mixed on one trailer axle,
one brake may apply sooner than the other, which could result in premature wear and uneven application of
brakes which requires prompt service.

NOTICE: The new-style S-cam should NOT be used with cast 12 1/4" brake shoes.  The cast brake shoes
require the use of the old-style S-cam.  S-cam service on cast brake shoes requires changing the brake shoes to
fabricated tapered lining brake shoes using the new-style S-cam.  Failure to change the brake shoe when using
the new-style S-cam will result in a failure of the S-cam to function properly and could also cause uneven
application of brakes which rqeuires prompt service.