AIR SYSTEM HAS NO EFFECT ON BRAKING (HARD BRAKING).

TM 5-2420-224-20-1

Table 3-5. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

BRAKES AND AIR SYSTEM (CONT)

89. AIR SYSTEM HAS NO EFFECT ON BRAKING (HARD BRAKING).

Step 1. Start engine < Check for low pressure in air tanks by waiting until red

warning light goes out or until dual brake gage indicates pressure of

75-106 psi.

If dual brake gage indicates 75-106 psi, replace air brake

booster (page 4-295).

If dual brake gage indicates less than 75-106 psi, go to step 2.

Step 2. Stop engine. Check for leaks in air system by observing brake fluid reservoir

air pressure indicator. If reservoir pressure drops suddenly, there are leaks

in air system.

If there are leaks in air system, tighten or replace loose lines

or connectors (pages 4-302, 4-303, 4-304, 4-307, 4-310, 4-313,

4-315, 4-318, 4-320, 4-324, 4-327, 4-329, 4-333). If problem

continues, notify direct support maintenance.

If there are no leaks in air system, go to step 3.

Step 3. Check fluid regulating valve adjustment as follows:

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