BENDIX TCH-020-018 Leaflet

Bulletin

Bulletin No: 

Effective Date: 

     Cancels: 

        Page:  1 of 

Subject:

© 2009 Bendix Commercial Vehicle Systems LLC All rights reserved. 9/2009 Printed in U.S.A.

TCH-020-018

10-1-2009

N/A

        1

Effective January 1, 2010 Bendix Spicer Foundation Brake LLC will no longer accept the Pre-1989 “soft boot” 
style caliper cores, piece number 55250, into core group number 22.  These calipers will be accepted under 
core group 69 only.

The old “soft boot” style calipers are of a design superseded in 1989 by the improved “hard boot” style.  Although 
the caliper assemblies can be used interchangeably, the component designs are not the same.  Caliper machining 
differences do not allow interchangeability of maintenance kits, components, and therefore cores.

The “soft boot” and “hard boot” calipers can be identifi ed by appearance or by depressing the edge of the boot 
with a screwdriver as shown in the illustrations below.  The “hard boot” style has a hard metal surface in the 
boot near the caliper bore.  The “soft boot” style can be identifi ed by the 3-fold boot design and by the lack 
of the metal reinforcement near the caliper bore.  Casting numbers or other markings can not be used as an 
identifi cation method.

For additional information regarding core classifi cation and values, see Part Number Update Bulletin PNU-146-000.

Boot - 

3 folds

Caliper 

Heat Shield

Piston

Piston

Seal

 Boot - 
2 folds

Caliper 

Heat Shield

Seal

Reinforcement

Metal Insert

Reinforcement