Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 21

PM-22

Transmission Gear Oil

PERIODIC MAINTENANCE SERVICES

14.Transmission Gear Oil

A: INSPECTION

1. 6MT MODEL

Refer to “6MT” section for transmission gear oil in-

spection. <Ref. to 6MT-26, INSPECTION, Trans-

mission Gear Oil.>

2. 5MT MODEL

Refer to “5MT” section for transmission gear oil in-

spection. <Ref. to 5MT-22, INSPECTION, Trans-

mission Gear Oil.>

B: REPLACEMENT

1. 6MT MODEL

Refer to “6MT” section for transmission gear oil re-

placement. <Ref. to 6MT-26, REPLACEMENT,

Transmission Gear Oil.>

2. 5MT MODEL

Refer to “5MT” section for transmission gear oil re-

placement. <Ref. to 5MT-22, REPLACEMENT,

Transmission Gear Oil.>

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PM-23

Front & Rear Differential Gear Oil

PERIODIC MAINTENANCE SERVICES

15.Front & Rear Differential Gear

Oil

A: INSPECTION

1. FRONT DIFFERENTIAL

Refer to “6MT” or “5MT” section for front differential

gear oil inspection. <Ref. to 6MT-26, INSPEC-

TION, Transmission Gear Oil.> <Ref. to 5MT-22,

INSPECTION, Transmission Gear Oil.>

2. REAR DIFFERENTIAL

Refer to “DI” section for rear differential gear oil in-

spection. <Ref. to DI-18, INSPECTION, Differential

Gear Oil.>

B: REPLACEMENT

1. FRONT DIFFERENTIAL

As well as transmission oil, differential oil is used to

lubricate the differential. Refer to “Transmission

Oil”. <Ref. to PM-22, Transmission Gear Oil.>

2. REAR DIFFERENTIAL

Refer to “DI” section for rear differential gear oil re-

placement. <Ref. to DI-19, REPLACEMENT, Dif-

ferential Gear Oil.>

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PM-24

Brake Line

PERIODIC MAINTENANCE SERVICES

16.Brake Line

A: INSPECTION

1. BRAKE LINE

1) Check for scratches, swelling, corrosion, traces

of fluid leakage on the brake hoses or pipe joints.

2) Check the possibility of adjacent parts interfering

with brake pipes/hoses during driving, and loose

connections/clamps.

3) Check any trace of fluid leakage, scratches, etc.

on master cylinder and wheel cylinder.
NOTE:

• When the brake fluid level in the reservoir tank is

lower than specified limit, the brake warning light

on the combination meter will illuminate.

• Visually check the brake hose for damage. (Use

a mirror where it is difficult to see)

2. SERVICE BRAKE

1) Move to the pull-up direction with the force of

less than 10 N (1 kgf, 2 lbf) and check the free play.
Brake pedal play

0.5 — 2.0 mm (0.02 — 0.08 in)

2) If the free play is out of specifications above, ad-

just the brake pedal. <Ref. to BR-48, INSPEC-

TION, Brake Pedal.>

3) Check the pedal stroke.

While the engine is idling, depress the brake pedal

with a 490 N (50 kgf, 110 lbf) load and measure the

distance between the brake pedal and steering

wheel. With the brake pedal released, measure the

distance between pedal and steering wheel again.

The difference between the two measured values

must be the specified value or less. If the measured

value is greater than or equal to the specification,

there is possibility of entering air in hydraulic unit.
Brake pedal stroke A:

110 mm (4.33 in)/ 490 N (50 kgf, 110 lbf) or

less

4) Check to see if air is in the brake fluid pressure

line by the feel of pedal operation. If air appears to

exist in the fluid pressure line, bleed it from the sys-

tem.

5) Check for even operation of all brakes, using a

brake tester or by driving the vehicle for a short dis-

tance on a straight road.

(1) Front brake hose
(2) Front brake pipe

(1) Rear brake pipe
(2) Rear brake hose
(3) Clamp

PM-00385

(1)

(2)

PM-00386

(3)

(2)

(3)

(1)

(A) Pedal free play

(A) Steering wheel
(B) Toe board

PM-00412

(A)

(B)

(A)

= A

1

1

2

2

PM-00045

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PM-25

Brake Line

PERIODIC MAINTENANCE SERVICES

3. BRAKE SERVO SYSTEM

1) With the engine off, depress the brake pedal

several times applying the same pedal force. Make

sure the travel distance should not change.

2) With the brake pedal depressed, start the en-

gine. Make sure the pedal should move slightly to-

ward the floor.

3) With the brake pedal depressed, stop the engine

and keep the pedal depressed for 30 seconds.

Make sure the pedal height should not change.

4) A check valve is built into the vacuum hose. Dis-

connect the vacuum hose to inspect function of

check valve.

Blow compressed air into vacuum hose from the

end of brake booster side. Check that the air flows

from the air hose on engine side. Next blow air into

hose from engine side: Check that the air does not

flow from the hose.

Replace the both check valve and vacuum hose if

the check valve is faulty. Engine side of vacuum

hose is indicated by marking “ENG” as shown.

5) Check the vacuum hose for cracks or other dam-

age.
NOTE:

When installing the vacuum hose on the engine

and brake booster, do not use soapy water or lubri-

cating oil on their connections.

6) Check the vacuum hose to make sure it is tightly

secured.

(A) Engine side
(B) Brake booster side

PM-00427

(B)

(A)

PM-00434

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