Covering the politics, Business and technology of defense - Subscribe Today

TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download

Page 550 of 890

TM 9-2320-280-20-1 REFERENCE INFORMATION BRAKES Change 2 2-447 WARNING Make sure the area is clear of personnel and obstacles prior to performing this test. Failure to do so may result in serious injury. P ARKING BRAKE TEST PROCEDURE : 1. Depress service brake pedal and start engine. 2. Place transmission shift lever in D (drive) and transfer case shift lever in H (high). 3. Apply parking brake. Slowly let up on service brake pedal. Vehicle should remain stationary. SER VICE BRAKE ROAD TEST PROCEDURE : 1. On an open, smooth, flat surface, accelerate to a steady, reasonable, safe speed (below posted limits). 2. Apply pressure on the brake pedal and bring the vehicle to a stop. 3. Repeat this procedure several times, applying a different brake pressure each time. Look for the following symptoms, which may indicate a problem with the service brakes: 1) Spongy or pulsating brake pedal, 2) Incomplete brake pedal return, 3) Excessive pull to one side, 4) Unusually long braking distance, 5) Rear wheels lock-up before front wheels, 6) Brake warning light comes on while braking, and 7) A squealing, grinding, or chattering noise while braking.