BENDIX TCH-020-005 User's Manual
Contents
1. Technical Bulletin Bulletin No PRO 20 05 Effective Date 12 1 89 Page 1 of 2 Subject New Revision Bendix 2 6 Twin Piston Caliper Beginning in vehicle model year 1989 Bendix began supplying an improved design of the 2 6 diameter twin piston caliper assembly Part number 55245 remains unchanged and is used for both the old and improved 2 6 caliper assembly Both versions of caliper 55245 are interchangeable as assemblies however the detail components are not The old and improved versions of caliper assembly 55245 can most easily be identified by checking the casting number on the rear of the caliper head The casting number appears right below the cast in BENDIX as shown 2 6 TWIN PISTON CALIPER CASTING DWG 1 INLET INLET PORT BLEED SCREW a ee CAST IN BENDIX INSTALLED ee re CASTING NO HERE n CASTING NO 4151733 IMPROVED CASTING NO 4151020 OLD The casting of the improved caliper is machined differently to accommodate a new boot and a new piston OLD AND NEW KITS AND PISTONS FOR CALIPER 55245 MAY NOT BE INTERCHANGED The improvements which affect interchange are 1 The old style piston 90055 is all steel The new style piston 4151728 is nonmetallic which incorporates a reinforced face to reduce abrasion from the disc pad The shape of the new piston has been altered to allow the installation of a heat shield not used on old style piston and to permit the boot folds to be2. ol can be made using the illustration in this bulletin BOOT amp HEAT SHIELD INSTALLATION TOOL FOR NEW REVISION 2 6 TWIN PISTON CALIPER 132 02 1452 005 STAMP BOOT 602 03 DIA 2 832 01 DIA 2 722 01 DIA 032 01 X 45 22 2852 005 2 922 01 OIA
3. stored partially in the caliper housing The storing feature provides a greater clearance between the boot folds and disc pad and reduces the chances for heat damage 2 The new boot is constructed with a metal insert and must be driven into the new caliper housing in the same manner as an oil or grease seal This provides a positive seal against water and contaminants The boot is made of a new material which has a much higher heat resistance 3 The caliper housing casting is machined differently to accept the new boot and carries a different casting number Casting number 4151020 appears on the OLD revision caliper while 4151733 appears on the NEW IMPROVED The new 2 6 caliper assembly can also be identified by noting the configuration of the boot pressed in 3 folds the presence of a heat shield and the nonmetallic piston with its metal face the old style piston is all steel Both the old and new calipers can be repaired using different kits Old style calipers use repair kit 66549 and piston 90055 The new caliper uses repair kit 107771 and piston 4151728 PC NO 55245 IMPROVED NON METALLIC METAL PISTON PISTON It is recommended that a boot driving tool be used to install the drive in boot in the new caliper This tool may be ordered directly from the Kent Moore Company Heavy Duty Division 1 800 328 6657 in the U S or 1 800 345 2233 in Canada using Kent Moore Part Number SE 4046 Alternatively the to
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