Master Brake Cylinder

(4) Insure that rubber boots are properly positioned

Caution: Do not distort or crack cylinder

in cylinder grooves.

body when securing cylinder in vise.

(1)

Secure master brake cylinder in vise.

3-32. Master Brake Cylinder

(2)

Remove boot (21 and piston rod (1).

a. General. The hydraulic master brake cylinder is

Note. Piston assembly parts will spring

located below the toe and floor plates on the inside

outward when lockwire is removed if parts are are

frame of the lift truck. The master brake cylinder and

not held in place.

hydraulic brake fluid reservoir are combined into one

(3)

Remove lockwire (3) from piston

body and are joined by intake and bypass ports located

assembly (5), while holding parts in place.

within the cylinder wall. Internal parts are removed and

(4)

Carefully remove piston plate (4), piston

installed at the push rod end of the cylinder. An electrical

assembly (5), primary cup (6), spring assembly (7), and

stop light switch is located on the opposite end of the

valve assembly (8).

cylinder. The cylinder piston is actuated through linkage

(5)

Remove stop light switch, fluid passage

when pressure is applied to the brake pedal.

bolt, outlet fitting (11), and gaskets 19 and 10) from

b. Removal. Remove the master brake cylinder

outlet end of cylinder.

TM 10-3930-620-12).

(6)

Remove filler cap (12) and nonmetallic

c. Disassembly. (fig. 3-45.)

washer (13) from body.

Piston rod

Valve assembly

Boot

Outlet gasket

Lockwire

10.

Outlet gasket

Piston plate

11.

Outlet fitting

Piston assembly

12.

Filler cap

Primary cup

13.

Nonmetallic washer

Spring assembly

Figure 3-45. Master brake cylinder, exploded view.

3-65