SPECIFICATIONS

Vehicle Systems Systems Operation
Brake System
Master Cylinder
Systems Without Power Brakes
Master Cylinder And Wheel Cylinder
(1) Piston. (2) Spring. (3) Inlet (4) Master cylinder reservoir.
(5) Relief valve. (6) Spring. (7) Piston. (8) Check valve.
(9) Outlet. (10) Seal. (11) Cup seal. (12) Wheel cylinders.
(13) Wheel cylinder pistons. (14) Brake shoes.
The master cylinder has two pistons (1) and (7)
which push brake liquid into the brake lines. The
main reservoir, located cowl is connected to inlet (3).
The supply lines keep master cylinder reservoir (4)
filled so no air enters the system. Reservoir (4) sup-
plies brake liquid to the system.
When the brake pedal is first pushed, both pistons
move into the master cylinder and push brake liquid
through outlet (9) into the brake lines. when floating
piston (7) seats on seal (10), the liquid that is pushed
by piston (1) goes around cup seal (11), out through
floating piston (7) and outlet (9). This action contin-
ues until the liquid pressure in piston (1) bore reach-
es the pressure that opens relief valve (5). The liq-
uid, being pushed by piston (1), now returns to reser-
voir (4). Cup seal (11) seals and the liquid inside pis-
ton (11) is pushed through piston (7) and outlet (9).
The liquid pushed through outlet (9) goes through
the brake lines to wheel cylinders (12)
Check valve (8) keeps a small amount of pressure in
the brake lines and wheel cylinders (12) when the
pedal is released. This small amount of pressure
helps the wheel cylinder piston cup seal seat, which
keeps air out of the brake system.
Shoe Type Brakes
Wheel Brakes
(12) Wheel cylinder. (15) Primary shoe. (16) Secondary shoe.
(17) Return springs. (18) Return spring. (19) Spring.
(20) Guide. (21) Star wheel. (22) Adjustment screw.
(23) Pin. (24) Plate. (25) Spring. (26) Spring. (27) Pin.
When the brake pedal is pushed down, the master
cylinder sends brake liquid to wheel cylinder (12).
The wheel cylinder pistons are pushed out and move
primary shoe (15) and secondary shoe (16). The
brake shoes move until they make contact with the
brake drum.
17
1 2 3 4 5 6
7
8
9
10
12
12
15
17
18
22
23 24 2526 27 21
SECTION A-A
24
20
19
17
16
14
13
11
IDCS115S
IDCS116S