Table of Contents
Advertisement
f
BR317
Fig
BR 23
Gre
ing point
4
Tightening
torque
Wheel
cylinder
J
S
to 1
8
kg
m
II
to
13ft
Ib
Connector bolt
1
9
to
2
5
kg
m
14
to
18
ft Ib
Brake tube
1 5
to 1
8
kg
m
II to 13
ft Ib
Air bleeder
0 7
to 0 9
kg
m
S to
7 ft Ib
Brake disc
5 4 to
6
4
kg
m
39
to
46
ft
Ib
S
Adjust
brake shoe clearance and
bleed brake system
Upon completion
of the above
adjustments
make
sure
that
brake
operates
correctly
and
no
brake fluid leaks
MASTER VAC
DESCRIPTION
A
vacuum
suspended
Master Vac is
installed behind
the master
cylinder
As the
brake
pedal
is
depressed
fluid
is
forced under
high
pressure
through
the brake
pipes
to
the wheel
cylinders
to
retard
or
stop
the
vehicle
The Master Vac
contains
a
spring
loaded
diaphragm
of IS2
4
mm
6
in
in
diameter
It operates
on
negative
pressure
produced
n
the
engine
intake
manifold
The
tandem
master
cylinder
is
capable
of
producing high
pressure
even
if the Master Vac
is
faulty
Brake
System
Note
The
Master
Vac
diaphragm
dif
fers from fonner
ones
for
improved
braking
force
Do not
install fonner
Master
Vac
on
1976 models
The
1
Plate
and seal
2
Push
rod
3
Diaphragm
4
Rear
shell
5
Diaphragm plate
Master
Vacs
are
identified
by
the
label color
as
follows
1976 model
Caution
Label
Former models
YeJlow
BR321
11
Valve
operating
rod
12
Valve return
spring
13
Poppet
return
spring
14
Exhaust valve
15
Valve
plunger
16
Reaction
disc
17
Diaphragm
return
spring
18
Front shell
6
Seal
7
Vacuum valve
8
Poppet
assembly
9
Valve
body guard
10
Air
silencer filter
INSPECTION OF
OPERATION
Checking
yscuum
pressure
I
Connect
a vacuum
gauge in
the
line between check valve and
Master
2
Start
engine
and
increase
engine
speed
Stop
engine
when
vacuum
gauge
indicates
SOO
mmHg
19
69
inHg
BR 14
Fig
BR 24 Sectionall1iew
of
Master Vac
Vac
as
shown
in
Figure
BR
25
1
Check
valve
2
Vacuum
gauge
BA169
Fig
BR 25 Air
tight
t
t
t up
Air
tight
test
I Fifteen seconds
after
engine
is
stopped
observe
the rate
of
drop
in air
pressure
registered by
vacuum
gauge
If
a
pressure
drop
of 25
mmHg
0 98
inHg
is
exceeded refer
to
the follow
ing
chart
to
determine the
cause
of
failure
Advertisement
Table of Contents
