TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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c. Installation 7-15. REAR DUAL SERVICE/PARKING BRAKE CALIPER MAINTENANCE (Cont'd) 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 (4) for cracks, pitting, or damage. Replace caliper (1) if cracked, pitted, or damaged. 4. Inspect caliper cable bracket (2) for looseness, damage, and rotation. If loose, damaged, or repositioned, replace caliper (1). 5. Inspect dust boot (5) for tears or deterioration. Replace caliper (1) if dust boot (5) is torn or deterio- rated. 6. Inspect rotor (6) for heat cracks, discoloration, pitting, or damage. Replace rotor (6) if cracked, pit- ted, or scored (para. 7-12). 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-head driver, remove locating pins (12) from yoke (11). Discard locating pins (12). NOTE • Replace brake pads in sets on both sides of differential. • Replace brake pads if thickness is less than 1/8 in. (3.2 mm) and operation in wet and muddy conditions is expected. 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. 7-14). b. Cleaning and Inspection TM 9-2320-387-24-1 7-44 Change 1 CAUTION Ensure grease and oil are not in contact with rotor and/or brake pad friction surface. Failure to do so will result in damage to equipment and poor performance. 1. Open bleeder valve (3) 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 two 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 clamp (10.1), two washers (10), and capscrews (9). Using crowfoot, tighten capscrews (9) to 30-40 lb-ft (41-54 N • m). 6. Install copper washer (13) and coupling (14) on caliper (1) and connect brake line (15) to coupling (14). 7. Install parking brake cable (23) on caliper cable bracket (16) with clip (17). CAUTION • Ensure lever is in contact with caliper cable bracket stop. Damage to equipment and poor performance will result if not aligned properly. • Ensure clevis and clevis pin are aligned to lever. Do not move lever to accommodate a misadjusted clevis, or damage to equip- ment and poor performance will result. 8. Check position of lever (18) and ensure it is in contact with caliper cable bracket stop (24). 9. Install parking brake clevis (21) on lever (18) with clevis pin (22), washer (20), and cotter pin (19).