Section Il. AIR RELAY VALVE

(2) Clean all other parts with a clean,

9-2. Master CyIinder

dry cloth.

a. Removal. Refer to paragraph 3-77 and

(3) Inspect for cracks, breaks, wear, pits,

remove the master cylinder.

(4) Replace a damaged or defective part.

b. Disassembly. Refer to figure 9-1 and dis-

d. Reassemble. Refer to figure 91 and re-

assemble the master cylinder.

c. Cleaning, Inspection and Repair.

e. Installation. Install the master cylinder as

(1) Clean all metal parts with an ap-

proved cleaning solvent and dry thoroughly.

Section Il. AIR RELAY VALVE

c. Cleaning, Inspection and Repair.

9-3. General

(1) Clean all metal parts with an ap-

The air relay valve controls the trailer brakes

proved cleaning solvent and dry thoroughly.

and automatically applies the trailer brakes in

(2) Clean the diaphragm with a cloth

event the trailer breaks away from the towing

dampened with an approved cleaning solvent

vehicle.

and dry thoroughly.

(3) Inspect for cracks, breaks, wear, dete-

9-4. Air Relay Valve

rioration and other damage.

a. Removal. Remove the air relay valve as

(4) Replace a damaged or defective part.

d. Reassembly. Refer to figure 9-2 and reas-

semble the air relay valve.

b. Disassembly. Refer to figure 9-2 and dis-

e. Installation. Install the air relay valve

assemble the air relay valve in numerical se-

quence.

Figure 9-2. Air relay valve.

9-2