Daewoo Matiz (2003 year). Manual - part 131

POWER BOOSTER  4C – 3

DIAGNOSTIC INFORMATION AND PROCEDURES

POWER BOOSTER FUNCTIONAL
CHECK

1. With the engine stopped, eliminate the vacuum in the

booster by pumping the brake pedal several times.

2. Push the pedal down and hold it in this position.

3. Start the engine.

4. The booster is OK if the pedal drops further because

of extra force produced.

If the brake pedal does not drop, the vacuum system
(vacuum hoses, check valve, etc.) is probably defective
and should be checked.

If no defect is revealed by checking the vacuum system,
the defect is in the booster itself.

CHECK VALVE FUNCTIONAL CHECK

1. Remove the vacuum hose.

2. Suck the vacuum hose to power booster. And also,

suck the vacuum hose to engine.

3. If the air pass through the check valve or not, replace

the check valve. And if the vacuum hose to engine is

only sucked, the check valve OK.

D17A301B

4C – 4  POWER BOOSTER

REPAIR INSTRUCTIONS

ON–VEHICLE SERVICE

D107A501

VACUUM HOSE AND CHECK VALVE

Removal Procedure

1. Remove the vacuum hose.

D

Disconnect the vacuum hose from the intake man-
ifold (1).

D17A502A

D

Disconnect the vacuum hose from the power
booster (2).

D107A503

Installation Procedure

1. Connect the vacuum hose to the power booster.

2. Connect the vacuum hose to the intake manifold.

POWER BOOSTER  4C – 5

D107A519

POWER BOOSTER ASSEMBLY
(LEFT–HAND DRIVE)

Removal Procedure

1. Remove the master cylinder assembly. Refer to Sec-

tion 4B, Master Cylinder.

2. Disconnect the vacuum hose from the power booster.

3. Remove the power booster.

D

Straighten the cotter pin and remove it (1).

D

Remove the clevis pin (2).

D107A520

D

Remove the nuts (3).

D107A521

D

Remove the power booster (4).

D17A522A

Installation Procedure

1. Install the power booster with the new cotter pin, cle-

vis pin and nuts.

Tighten

Tighten the nuts to 16 N

S

m (12 lb-ft).

Important: Make sure the distance from the booster
to the center of the clevis bore should be 100mm
(3.94 in.).

2. Install the master cylinder assembly. Refer to Section

4B, Master Cylinder.

3. Connect the vacuum hose to the power booster.

4. Bleed the brake system. Refer to Section 4A, Hy-

draulic Brakes.

4C – 6  POWER BOOSTER

D24C001

POWER BOOSTER ASSEMBLY
(RIGHT–HAND DRIVE)

Removal Procedure

1. Remove the master cylinder assembly. Refer to Sec-

tion 4B, Master Cylinder.

2. Disconnect the vacuum hose from the power booster.

3. Remove the instrument panel assembly. Refer to

Section 9E, Instrument/Driver Information.

4. Remove the evaporator unit mounting screws and

take off the evaporator unit a little. Refer to Section
7B, Manual Control Heating, Ventilation, and Air Con-
ditioning System.

5. Remove the power booster.

D

Straighten the cotter pin and remove it (1).

D

Remove the clevis pin (2).

D24C002

D

Remove the nuts (3).

D107A521

D

Remove the power booster (4).