Brake Booster
ON-VEHICLE SERVICE
Operating check
+Depress brake pedal several times with engine off. After
exhausting vacuum, make sure there is no change in pedal
stroke.
+ Depress brake pedal, then start engine. If pedal goes down
slightly, operation is normal.
Airtight check
+Start engine, and stop it after one or two minutes. Depress
brake pedal several times slowly. Booster is airtight if pedal
stroke is less each time.
+ Depress brake pedal while engine is running, and stop engine
with pedal depressed. The pedal stroke should not change after
holding pedal down for 30 seconds.
REMOVAL
CAUTION:
+Be careful not to splash brake ¯uid on painted areas; it
may cause paint damage. If brake ¯uid is splashed on
painted areas, wash it away with water immediately.
+ Be careful not to deform or bend brake pipes, during
removal of booster.
INSPECTION
Output rod length check
1. Apply vacuum of þ66.7 kPa (þ500 mmHg, þ19.69 inHg) to
brake booster with a hand vacuum pump.
2. Check output rod length. Speci®ed length:10.275 - 10.525 mm (0.4045 - 0.4144 in)
INSTALLATION
CAUTION:
+Be careful not to deform or bend brake pipes during instal-
lation of booster.
+ Replace clevis pin if damaged.
+ Re®ll with new brake ¯uid ``DOT 3''.
+ Never reuse drained brake ¯uid.
+ Take care not to damage brake booster mounting bolt
thread when installing. Due to the narrow angle of
installation, the threads can be damaged by the dash
panel.
SBR002A
SBR365AA
SBR170E
SBR281A
SBR116BF
BRAKE BOOSTER
BR-15
CONSULT Inspection Procedure
SELF-DIAGNOSIS PROCEDURE
1) Turn ignition switch OFF.
2) Connect CONSULT to Data Link Con- nector for CONSULT.
1) Start engine.
2) Drive vehicle over 30 km/h (19 MPH) for at least one minute.
1) Stop vehicle with engine runningand touch ``START'' on CONSULT
screen.
2) Touch ``ABS''.
3) Touch ``SELF-DIAG RESULTS''.
+ The screen shows the detected mal-
function and how many times the igni-
tion switch has been turned since the
malfunction.
Make the necessary repairs following the
diagnostic procedures.
After the malfunctions are repaired, erase
the self-diagnostic results stored in the
control unit by touching ``ERASE''.
Check warning lamp for deactivation after
driving vehicle over 30 km/h (19 MPH) for
at least one minute.
Test the ABS in a safe area to verify that it
functions properly.
Note: ``SELF-DIAG RESULTS'' screen shows the detected malfunction and how many times the ignition switch has been turned since the mal-
function.
SBR195E
SBR455D
SBR080E
SST412B
SBR950C
.
.
.
.
.
.
TROUBLE DIAGNOSES
BR-51
DATA MONITOR MODE
MONITOR ITEM CONDITION SPECIFICATION
FR RH SENSOR
FR LH SENSOR
RR SENSOR
RR RH SENSOR
RR LH SENSORDrive vehicle.
(Each wheel is rotating.)
Wheel speed signal
(Almost the same speed as speedometer.)
STOP LAMP SW Brake is depressed. Depress the pedal: ON
Release the pedal: OFF
G-SWITCH Vehicle is driven.
Vehicle is stopped.
Brake is applied.During sudden braking while driving on high roads (asphalt
roads, etc.): OFF
While vehicle is stopped or during constant-speed driving: ON
FR RH IN SOL
FR RH OUT SOL
FR LH IN SOL
FR LH OUT SOL
RR IN SOL
RR OUT SOL 1. Drive vehicle at speeds over
30 km/h (19 MPH) for at
least one minute.
2. Engine is running. Operating conditions for each solenoid valve are indicated.
ABS is not operating: OFF
MOTOR RELAY ABS is not operating: OFF
ABS is operating: ON
ACTUATOR RELAY Ignition switch is ON or
engine is running.Ignition switch ON (Engine stops): OFF
Engine running: ON
WARNING LAMP ABS warning lamp is turned on: ON
ABS warning lamp is turned off: OFF
BATTERY VOLT Power supply voltage for control unit
ACTIVE TEST MODE
TEST ITEM CONDITION JUDGEMENT
FR RH SOLENOID
FR LH SOLENOID
REAR SOLENOID Engine is running.Brake ¯uid pressure control operation
IN SOL OUT SOL
UP (Increase):
KEEP (Hold):
DOWN (Decrease): OFF
ON
ONOFF
OFF
ON
ABS MOTOR ABS actuator motor
ON: Motor runs (ABS motor relay ON)
OFF: Motor stops (ABS motor relay OFF)
G SWITCH Ignition switch is ON. G SWITCH (G SENSOR),
ON: Set G SWITCH MONITOR ``ON''
(G switch circuit is closed.)
OFF: Set G SWITCH MONITOR ``OFF'' (G switch circuit is open.)
Note: Active test will automatically stop ten seconds after the test starts. (LIMIT SIGNAL monitor shows ON.)
TROUBLE DIAGNOSES
CONSULT Inspection Procedure (Cont'd)
BR-55
