Table of Contents
Advertisement
5 - 8
BRAKES
•
fluid flow to t h e front brakes. A s a result, t h e valve
m u s t be h e l d open w i t h special tool C-4121 w h e n us-
i n g pressure bleeding equipment.
BLEEDING
PROCEDURE
(1) I f a new or overhauled master cylinder w i l l be
used, be sure to bleed t h e cylinder before i n s t a l l i n g i t
i n t h e vehicle. Refer t o t h e procedure i n the Master
Cylinder section.
(2) I f master cylinder has not been serviced, clean
a l l d i r t a n d foreign m a t e r i a l from master cylinder
and cover t o prevent d i r t e n t e r i n g t h e cylinder reser-
voirs. T h e n remove the cover.
(3) I f pressure bleeding t a n k C-3496-B w i l l be used,
i n s t a l l adapter C-4578 o n t h e master cylinder and
prepare t h e t a n k for bleeding according to instruc-
tions provided b y the supplier.
(4) I f pressure bleeding equipment w i l l be used,
hold the m e t e r i n g valve open w i t h tool C-4121. T h e
tool is i n s t a l l e d on the valve stem t o h o l d i t (and the
valve) open (Fig. 4).
CAUTION: Under no condition should a rigid clamp,
wedge or block be used to press the valve stem in-
ward tyo hold the valve open. This practice could
damage the valve resulting in valve failure and
complete loss of front brake action. Note that the
valve stem is in its innermost position when there
is no pressure present. No attempt should be made
to further depress the valve stem.
(5) Bleed t h e system i n the f o l l o w i n g sequence and
bleed only one wheel or valve a t a t i m e :
• R W A L h y d r a u l i c valve
• r i g h t rear wheel
• left rear wheel
• r i g h t f r o n t wheel
• left f r o n t wheel
(6) Clean the bleed screw on the R W A L h y d r a u l i c
valve. Connect a bleed hose to the screw and insert
the opposite e n d of the bleed hose i n a glass con-
tainer p a r t i a l l y filled w i t h brake fluid. Be sure t h e
end o f the bleed hose is f u l l y submerged i n fluid oth-
erwise a i r w i l l be d r a w n back i n t o t h e system.
(7) Perform bleeding operations as follows:
(a) I f m a n u a l b l e e d i n g , have the helper press
the brake pedal to the floorpan. T i g h t e n the bleed
screw a t t h i s p o i n t and and have the helper release
the pedal. Open t h e bleed screw a n d have t h e
helper press the pedal down again. Continue bleed-
i n g u n t i l only clear, bubble free fluid flows i n t o the
container. Move on t o t h e r i g h t rear wheel after
valve bleeding is completed.
(b) I f p r e s s u r e b l e e d i n g , open t h e bleed screw
and allow
fluid
to flow t h r o u g h t h e valve. Stop
bleeding w h e n only clear, bubble free
fluid
flows
into the fluid container.
(8) Continue bleeding operations i n t h e recom-
mended sequence a t the wheel brake u n i t s .
(9) Repeat the bleeding procedure i f the system i n -
dicator l i g h t s r e m a i n on or i f the pedal is spongy.
Fig. 4 Metering Valve Tool C-4121
WHEEL NUT TIGHTENING
The wheel a t t a c h i n g nuts m u s t be tightened prop-
e r l y t o ensure efficient brake operation. O v e r t i g h t e n -
i n g
t h e n u t s or t i g h t e n i n g t h e m i n t h e w r o n g
sequence can cause distortion o f t h e brake rotors a n d
drums.
Impact wrenches are not recommended for t i g h t e n -
i n g wheel nuts. A torque wrench should be used for
t h i s purpose a t a l l times.
The correct t i g h t e n i n g sequence is i m p o r t a n t i n
avoiding rotor and d r u m d i s t o r t i o n . The correct se-
quence is i n a diagonal crossing p a t t e r n (Fig. 5).
Seat t h e wheel and i n s t a l l t h e wheel nuts
finger
t i g h t . T i g h t e n t h e nuts i n t h e sequence t o 1/2 re-
q u i r e d torque. T h e n repeat the t i g h t e n i n g sequence
to final specified torque.
Fig. 5 Wheel Nut Tightening Sequence
STOP LAMP SWITCH ADJUSTMENT
The stop l a m p (or stop lamp/speed control) s w i t c h
and m o u n t i n g bracket assembly is attached t o t h e
Advertisement
Table of Contents
