BENDIX TCH-020-001 User's Manual
Contents
1. 025 shim 2 C 045 shim 2 A typical oversize key kit contains the following parts which are keyed to Figure 1 KEY DESCRIPTION QTY A Caliper support spring 2 B Caliper support key 2 Not Illustrated Clip 1 SUPPORT suin SPRING BD CALIPER pe RETEHTION BOLT FIGURE 1 The following procedure should be used to determine if an oversize key kit H5604 H5608 or shim CALIPER BUMPER GAP D kit 4151706 is required Refer to Figures 1 2 amp 3 FIGURE 2 FIGURE 3 1 Remove the caliper assembly from the anchor plate by first removing the key retention bolt and tapping out the key and support spring 2 Clean the V way surfaces of the caliper and anchor plate with a wire brush and using a file smooth any deep nicks and or gouges 3 Lay a straight edge across the caliper V way surfaces as shown in Figure 2 and measure the wear on these surfaces using a feeler gauge Calipers which display wear of 050 or greater should be replaced 4 Reinstall the caliper in the anchor plate Temporarily install a new key WITHOUT IN STALLING THE SUPPORT SPRING Secure the key to the caliper using the retention bolt 5 Insert a suitable prying tool between the caliper and support key making certain the tool is equally distant from each edge of the caliper Pry firmly to assure that the caliper is seated against the three 3 sliding surfaces A B amp C illustrated in Figure 3 6 Measure the bumper gap formed between t2. Technical Bulletin Bulletin No PRO 20 01 Effective Date 10 1 88 Page 1 of 3 Subject Bendix Disc Brake Shim and O S Support Key Kits A shim kit designed to compensate for wear between the caliper and anchor plate is now available for all Bendix medium duty hydraulic disc brakes The new shim kit part no 4151706 may be installed on all disc brake assemblies which use the calipers listed below BENDIX CALIPER CALIPER DISC PAD MOST COMMON PART NO PISTON DIA PART NO APPLICATION 55098 3 38 S P MKD184 Navistar 1600 55099 3 38 S P MKD184 Navistar 1600 55245 2 6 T P MKD184 Navistar 55250 2 88 T P MKD225 GM Chevy SHIM KIT 4151706 CANNOT BE INSTALLED ON LIGHT TRUCK VERSIONS OF THE 3 38 SINGLE PISTON DISC BRAKE The light truck 3 38 single piston calipers listed below require the use of over sized caliper retainer keys rather than shims BENDIX CALIPER CALIPER DISC PAD MOST COMMON PART NO PISTON DIA PART NO APPLICATION 55199 3 38 S P MKD149 GM Chevy 55200 3 38 S P MKD149 GM Chevy The light and medium truck version of the 3 38 single piston caliper can be differentiated by the ve hicle application and caliper part number The disc pa can also provide a means of identifying the caliper since different part numbers are used on the light and medium versions Shim kit 4151706 contains the following part which are keyed to Figure 1 KEY DESCRIPTION QTY A Caliper support spring 2 B Caliper support key 2 C
3. he key and caliper using a feeler gauge or per g yi y p 8 gaug stack of feeler gauges MAKE THIS MEASUREMENT ON ONE SIDE OF THE PRYING TOOL THEN THE OTHER 7 Using the bumper gap measurement select the appropriate shim kit or oversize key kit SHIM KIT 4151706 FOR MEDIUM TRUCK DISC BRAKES ONLY MEASURED SHIM THICKNESS BUMPER GAP REQUIRED 0 0 to 058 No Shim Required 059 to 101 025 Shim 102 to 145 045 Shim Greater than 145 SEE CAUTION BELOW OVERSIZE KEY KITS FOR LIGHT TRUCK 3 38 DISC BRAKES ONLY MEASURED KEY KIT BUMPER GAP SIZE PART NO 0 0 to 060 STD H5604 061 to 100 040 O S H5605 101 to 140 080 O S H5606 141 to 180 120 O S H5607 181 to 220 160 O S H5608 Greater than 220 SEE CAUTION BELOW CAUTION If the measured bumper gap exceeds the maximum shown for the shim or oversize key kit it will be necessary to replace the caliper or anchor plate or both To determine which component must be replaced install a new caliper in the existing anchor plate and again measure the bumper gap If the bumper gap is less than the maximum shown select the appropriate key kit or shim If the bumper gap is greater than the maximum shown then replace the anchor plate and remeasure using the old caliper If the bumper gap is still greater than the maximum shown install the new caliper on the new anchor plate
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