Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 22
PM-26
Brake Fluid
PERIODIC MAINTENANCE SERVICES
17.Brake Fluid
A: INSPECTION
1) Check that the amount of brake fluid is between
the lines of “MIN” and “MAX”. If out of the specified
range, refill or drain the fluid. If the fluid level is
close to “MIN”, check the brake pad for wear and
refill the fluid.
2) Check the fluid for discoloration. If the fluid is ex-
tremely discolored, replace with the new fluid.
B: REPLACEMENT
CAUTION:
• Do not let brake fluid come into contact with
the painted surface of the vehicle body. Wash
away with water immediately and wipe off if it is
spilled by accident.
• Avoid mixing brake fluid of different brands
to prevent fluid performance from degrading.
• Be careful not to allow dirt or dust to enter the
reservoir tank.
• If the brake fluid is spilt over exhaust pipe,
wipe it off with cloth to avoid emitting smoke or
causing a fire.
NOTE:
• During the operation, keep the reservoir tank
filled with brake fluid to prevent entry of air.
• Operate the brake pedal slowly.
• For convenience and safety, perform the work
with 2 people.
• The required amount of brake fluid is approxi-
mately 500 mL (16.9 US fl oz, 17.6 Imp fl oz) for the
entire brake system.
1) Either jack-up the vehicle and place a rigid rack
under it, or have the vehicle lifted.
2) Remove all the wheels.
3) Drain brake fluid from the reservoir tank.
4) Refill the reservoir tank with recommended
brake fluid.
Recommended brake fluid:
Refer to “RM” section. <Ref. to RM-4, FLUID,
RECOMMENDED MATERIALS, Recommend-
Perform the same procedure as for bleeding the
brake line, until new brake fluid comes out from vi-
nyl tube. <Ref. to BR-41, PROCEDURE, Air Bleed-
ing.>
NOTE:
Perform brake fluid replacement starting in the or-
der from the farthest wheel cylinder from the mas-
ter cylinder.
5) Install one end of a vinyl tube onto the air bleeder
and insert the other end of the tube into a container
to collect the brake fluid.
NOTE:
For calipers with two air bleeder screws, bleed air
from the inner side first and then the outer side.
6) Instruct your co-worker to depress the brake
pedal slowly two or three times and then hold it de-
pressed.
7) Loosen the bleeder screw approximately 1/4
turn until a small amount of brake fluid drains into
the container, and then quickly tighten the screw.
8) Repeat steps 6) and 7) until there are no air bub-
bles in drained brake fluid and new fluid flows
through vinyl tube.
NOTE:
Add brake fluid as necessary while performing the
air bleed operation, in order to prevent the tank
from running short of brake fluid.
9) After completing the bleeding operation, hold the
brake pedal depressed and tighten the screw and
install bleeder cap.
Tightening torque:
Brembo type: 20 N·m (2.0 kgf-m, 14.8 ft-lb)
Except for brembo type: 8 N·m (0.8 kgf-m, 5.9
ft-lb)
10) Bleed air from each wheel cylinder by following
steps from 5) to 9).
11) Depress the brake pedal with a force of approx.
294 N (30 kgf, 66 lbf) and hold it there for approx.
20 seconds. At this time check the pedal to see if it
makes any unusual movement. Visually inspect the
bleeder screws and brake pipe joints to confirm
there is no fluid leakage.
(1) Inner side air bleeder screw
(2) Outer side air bleeder screw
BR-00376
(2)
(1)
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