Subaru SVX 1992 Manual page 887

BRAKES [W9AO] 4-4
9. Air Bleeding
A: BLEEDING PROCEDURE
a . The FMVSS No . 116, fresh DOTS or 4 brake fluid
must be used.
b . Cover bleeder with waste cloth, when loosening it,
to prevent brake fluid from being splashed over sur-
rounding parts.
c. Avoid mixing different brands of brake fluid to
prevent degrading the quality of the fluid.
d . Be careful not to allow dirt or dust to get into the
reservoir tank.
e. During bleeding operation, keep the brake reserve
tank filled with brake fluid to eliminate entry of air.
f. Brake pedal operating must be very slow.
g . For convenience and safety, it is advisable to have
two man working.
1) Make sure that there is no leak from joints and
connections of the brake system .
Fig. 123
2) Fit one end of vinyl tube into the air bleeder and put
the other end into a brake fluid container .
3) Slowly depress the brake pedal and keep it de-
pressed . Then, open the air bleeder to discharge air
together with the fluid .
Release air bleeder for 1 to 2 seconds .
Next, with the bleeder closed, slowly release the brake
pedal .
Repeat these steps until there are no more air bubbles
in the vinyl tube .
Allow 3 to 4 seconds between two brake pedal opera-
tions .
4) Tighten air bleeder securely when no air bubbles are
visible .
Tightening torque (Bleeder screw) :
7 - 9 N"m (0.7 - 0 .9 kg-m, 5 .1 - 6 .5 ft-Ib)
5) Bleed air from brake system in numerical sequence
shown in Figure 124 and 125 using above steps as a
guide .
® uo
Q
1F
® ~-Val
OH P
~ \ © Primary
s ® /RL RR
air bleeder
Secondary
air bleeder
1~®
C4-s48
Fig. 124 Hydraulic unit
Bleeding sequence O p-+ U s-+ 1~ -+ ~4 - 9 -+
Front right right
Master
Rear right
40
Hydrau I is
N
unit
® 20
Front left
Proportioning Rear left
valve
C4-s49
Fig . 125
6) If the pedal action is soft and spongy, or pedal
travels excessively, the system must be bled of air
again.
7) Depress brake pedal with a force of approximately
294 N (30 kg, 66 lb) and hold it there for approximately
20 seconds . At this time check pedal to see if it shows
any unusual movement .
Visually inspect bleeder screws and brake pipe joints to
make sure that there is no fluid leakage .
8) Add brake fluid to the required level (MAX level) of
reserve tank .
9) Install wheels, and drive car for a short distance
between 2 to 3 km (1 to 2 miles) to make sure that
brakes are operating properly.
57