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9-1
Master Cylinder
Disassembly of Power Brake Assembly.
Note Page
No.
No.
Disassembly of Hydraulic Cylinder
Assembly
l5a 9-10
Disassembly of Vacuum Control
Valve Assembly
lSb 9-10
Disassembly of Vacuum Piston
.
.
.
15c 9-12
Disassembly of Check Valve
15d 9-12
16
9-13
.
.
17
9-13
Assembly of Vacuum Piston
l7a 9-13
10
9-9
.
17b 9-13
.
.
.
17c 9-13
11
99
Assembly of Check Valve
17d 9-14
18
9-14
12
9-10
19
9-14
.
.
.
.
20
9-14
.
.
.
21
9-15
9-15
23
9-15
GENERAL DESCRIPTION
The braking system
consists of hydraulically
operated service brakes and a hand lever which
applies the brake shoes on the rear wheels in
dependently through a mechanical linkage.
The hydraulic brake system consists of a fluid
supply reservoir,
a master cylinder in which the
hydraulic pressure is originated, four wheel cyl
inders,
where hydraulic pressure is directed to
apply the brake shoes to the drums, the tubing and
flexible hoses which connect the master cylinder
to the wheel cylinders.
A remote filler tube, connected by a pipe to
the master cylinder, is mounted on the left side of
the cowl to facilitate the addition of fluid to the
system.
The master cylinder is mounted on a bracket
attached to the frame just ahead of the brake pedal.
The function of this unit is to maintain a constant
volume of fluid in the brake system at all times,
regardless
of expansion or contraction due to
temperature changes, and to transfer mechanical
pressure at the brake pedal to hydraulic pressure
on the wheel cylinders.
When the brake pedal is depressed, the master
cylinder piston cup closes the by-pass port and
builds up pressure in the brake lines and wheel
cylinders.
When the pedal is released, however,
the return of the piston and primary cup in the
master cylinder is much faster than the return of
fluid from the wheel cylinders to the master cyl
inder. Consequently, a momentary vacuum is crea
ted behind the piston and fluid is drawn frum the
reservoir
into
the cylinder barrel during this
period through the drilled holes in the piston and
past the lip of the primary cup. When the retracting
springs fully release the brake shoes, the excess
fluid
returning
to
the master cylinder passes
through the by-pass
port into the reservoir.
A
check valve at the front end of the master cylinder
traps approximately 9 pounds of fluid pressure in
the lines to the wheel cylinders.
Wheel cylinders are of the double piston type
and are mounted on the brake backing plate just
below the anchor pin. Pressure of the fluid in the
wheel cylinder, when the brake pedal is depressed,
causes the pistons to move outward and force the
brake shoes into contact with the drums.
The front wheel brake cylinders have a larger
diameter than those on the rear to maintain a higher
braking ratio at the front wheels. This is required
so that the front wheels will stop turning at the
same
time
as the rear
on emergency stops.
Rubber cups, in the master and wheel cylinders,
BRAKES
TABLE OF CONTENTS
Note Page
No.
No,
Note Name
1
9-5
2
9-5
3
9-5
4
9-6
5
9-7
6
9-7
7
9-8
8
9-8
9
9-8
Note Name
.
.
13
9-10
14
9-10
15
9-10
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