TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
Page 769 of 953
7-22. REAR DUAL SERVICE/PARKING BRAKE CALIPER MAINTENANCE (Cont'd) TM 9-2320-280-20-2 7-54 Change 3 NOTE Apply a light coat of grease on adapter slides. 1. Clean mating surfaces of caliper (1) and adapter (7) and lubricate adapter slides with grease. 2. Clean cooling fins of rotor (6). 3. Inspect caliper (1) and caliper piston face (4) for cracks, pitting, or damage. Replace caliper assembly if cracked, pitted, or damaged. 4. Inspect caliper cable bracket (5) for looseness, damage, and rotation. If loose, damaged, or repositioned, replace caliper assembly (1). 5. Inspect dust boot (3) for tears or deterioration. Replace caliper assembly if dust boot (3) is torn or deteriorated. 6. Inspect rotor (6) for heat cracks, discoloration, pitting, or damage. Replace rotor (6) if cracked, pitted, or scored (para. 7-19). 7. Inspect yoke locating pins (12) for cracks or corrosion. Perform step 8 if cracked or corroded. If not, perform step 9. 8. Using 7 mm hex driver, remove locating pins (12) from yoke (11). Discard locating pins (12). 9. Inspect brake pads (8) for glazing, oil saturation, or wear. If glazed, oil saturated, or if brake pad thickness is less than 1/8 in. (3.2 mm), replace both pads (8) and pads on opposite caliper (para. 7-21). CAUTION Ensure that grease and oil are not in contact with rotor and/or brake shoe friction surfaces. Failure to do so will result in damage to equipment and poor performance. 1. Open bleeder valve (2) and depress piston (4) into caliper (1) while rotating piston (4) in a clockwise direction, and at the same time apply pressure until piston (4) is seated in piston bore. NOTE Perform step 2 only if yoke locating pins were removed. 2. Apply sealing compound to threads of locating pins (12) and install locating pins (12) in yoke (11) using 7 mm hex head driver. Tighten locating pins (12) to 25-35 lb-ft (34-47 N•m). 3. Slide yoke (11) and locating pins (12) into caliper (1). 4. Apply sealing compound to tapped holes of adapter (7). 5. Install caliper (1) and yoke (11) on adapter (7) with two washers (10) and capscrews (9). Using crowfoot, tighten capscrews (9) to 30-40 lb-ft (41-54 N• m). 6. Install flat washer (15) and coupling (14) on caliper (1) and connect brake line (13) to coupling (14). 7. Install parking brake cable (24) on caliper cable bracket (18) with retaining ring (19). CAUTION • Ensure lever is in contact with caliper cable bracket stop. Damage to equipment and poor performance will result if not alined properly. • Ensure that the clevis and clevis pin are alined to lever. Do not move the lever to accommodate a misadjusted clevis, or damage to equipment and poor performance will result. 8. Check position of lever (17) and ensure it is in contact with caliper cable bracket stop (16). 9. Install parking brake clevis (22) to lever (17) with clevis pin (23), washer (21), and cotter pin (20). c. Installation b. Cleaning and Inspection