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2-12
_ ..
~
... ..,-0
3105-R.H.
28160
3106·L.H.
ROTOR SPLASH SHIEL
2Koo.I·R.H.
2K005·L.H.
GROUP
2-BRAKES
CALIPER
A~'Y
. . , -
28 118
R.H.
28119
L.H.
&...._
INSULATOR
,~
SEAL
28~29928115
CLIP
~
·
2207
2BI64
-~:~-
~
BOOT
ANCHOR PLATE
.
• ,
.
2B293
L.H.
""'
2B292 R.H.
.
1202
ROTOR
1102..1....---'
SHOE
2019
FIG. 11- Disc Brake- Disassembled- Girling illustrated.
FIG. 12- Floating Caliper Assembly-
Sectional View
PISTON SEAL
DISTORTED
PISTON
PISTON SEAL
RELAXED
CALIPER HOUSING
BRAKES APPLIED
BRAKES RELEASED
FIG. 13- Function of Piston Seal
The self adjusting brake mechan-
ism consists of a cable, cable guide,
adjusting lever, adjusting screw as-
sembly and adjuster spring (Fig. 1 S).
The cable is hooked over the anchor
pin at the top and is connected to the
lever at the bottom. The cable is
routed along the web of. the secon-
dary brake shoe by means of the
cable guide.
The adjuster spring is hooked to
the primary brake shoe and to the
lever.
The automatic adjuster oper-
ates only when the brakes are applied
while the vehicle is moving rearward
and only when the secondary shoe is
free to move toward the drum
beyond a predetermined point.
With the car moving rearward
~d
the brakes applied, the wrap-around
action of i:he shoes following the
drum forces the upper end of the
primary shoe against the anchor pin.
The action of the wheel cylinder
moves the upper end of the secon-
dary shoe away from the anchor pin.
The movement of the secondary shoe
causes the cable to pull the adjusting
lever upward and against the end of a
tooth on the adjusting screw star-
wheel. The upward travel of the lever
increases as lining wear increases.
When the lever can move upward far
eno1;gh it passes over the end of the
tooth and engages the tooth. When
the brakes are released, the adjusting
spring pulls the lever downward
causing the star-wheel to turn and
expand the shoes. The star-wheel is
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