Section II. WHEEL CYLINDER

TM 10-3930-630-34

(3) Linings severely burned or charred.

9-3. Service Brake, Cleaning, Inspection and Repair

(4) Linings deeply scored.

NOTE

(5) Brake mounting worn, twisted or out of round.

When handling brake shoes, be

(6) Cracked shoes.

careful not to get grease or dirt on

c. The brake shoes (4, fig. 9-1) employ bonded

brake linings as serious damage may

linings. If replacement is necessary, the complete brake

result.

shoe must be replaced.

a. Inspect springs for cracks and brittleness. Upper

return spring (1, fig. 9-1) must have a free length of 7.5

9-4. Service Brake, Reassembly and Installation

inches (190.5 mm) inside hoops, initial tension must be

a. Service brakes are reassembled during the

30 pounds (13.5 kg) and initial stretch of 0.5 inch (12.7

installation procedure.

Install and reassemble the

mm). Lower return spring (2) must have a free length of

service brake in reverse numerical sequence as

3.0625 (77.7 mm) inside hooks, initial tension of 30

illustrated in figure 9-1.

pounds (13.5 kg) and initial stretch of 0.25 inch (6.35

b. Refer to paragraph 7-4 and install the front drive

mm). Replace unserviceable springs.

wheels.

b. Brake shoe replacement is necessary if any of the

following problems are observed.

(1) Lining worn to shoe mounting.

(2) Grease or hydraulic fluid soaked linings.

Section II. WHEEL CYLINDER

9-6.Wheel Cylinder, Removal and Disassembly

9-5. Description

a. Removal. Refer to TM 10-3930-630-12 and

a. The hydraulic wheel cylinder houses two opposed

remove the wheel cylinder.

pistons which actuate the opposed brake shoes. The

b. Disassembly. Disassemble the wheel cylinder in

pistons, rubber cups and springs are held in place, in the

cylinder, by the brake shoe mechanical pressure.

numerical sequence as illustrated in figure 9-2.

b. The open ends of the cylinders are protected with

rubber boots.

TA067428

1 Cylinder boot

4 Spring

2 Cylinder piston

5 Bleed screw

3 Piston cup

6 Cylinder body

Figure 9-2. Wheel cylinder, disassembly and reassembly.

9-2