BR-35
Brake Booster
BRAKE
• AIR TIGHTNESS CHECK
1) Start the engine and keep it running until vacu-
um pressure indicates point A of the vacuum gauge
= 66.7 kPa (500 mmHg, 19.69 inHg). Do not de-
press the brake pedal at this time.
2) Stop the engine and check the gauge. If the vac-
uum pressure drop within 15 seconds after stop-
ping the engine is 3.3 kPa (25 mmHg, 0.98 inHg) or
less, the function of brake booster is normal.
If faulty, the cause may be one of the following.
• Check valve malfunction
• Leak from vacuum hose
• Leak from shell joint section or stud bolt welded
section
• Damaged diaphragm
• Leak from valve body seal and bearing section
• Leak from plate and seal assembly section
• Leak from poppet valve assembly section
• LOADED AIR TIGHTNESS CHECK
1) Start the engine and depress the brake pedal
with a pedal force of 196 N (20 kgf, 44 lbf). Keep
the engine running and keep the pedal pressed
until a vacuum of point B = 66.7 kPa (500 mmHg,
19.69 inHg) is indicated on the vacuum gauge.
2) Stop the engine and check the vacuum gauge.
If the vacuum pressure drop within 15 seconds
after stopping the engine is 3.3 kPa (25 mmHg,
0.98 inHg) or less, the function of brake booster
is normal.
If defective, refer to “AIR TIGHTNESS CHECK”.
<Ref. to BR-33, INSPECTION, Brake Booster.>
3) If the brake booster is faulty, replace it with a
new part.
• LACK OF BOOST ACTION CHECK
Turn the engine OFF, and set the value of the vac-
uum gauge to “0”. Then, check the fluid pressure
when the brake pedal is depressed. The pressure
must be greater than the specification listed.
• BOOSTING ACTION CHECK
Set the vacuum gauge reading to 66.7 kPa
(500 mmHg, 19.69 inHg) with the engine running.
Then, check the fluid pressure when the brake
pedal is depressed. The pressure must be greater
than the specification listed.
(1) Pressure gauge
(2) Vacuum gauge
(1) Pressure gauge
(2) Vacuum gauge
(3) Pedal force gauge
(4) Depressed
BR-00083
(1)
(2)
A
BR-00084
B
(1)
(2)
(3)
(4)
Brake pedal operation
force
N (kgf, lbf)
147 (15, 33)
294 (30, 66)
Fluid pressure
kPa (kgf/cm
2
, psi)
545
(6, 79)
1,564
(16, 227)
Brake pedal operation
force
N (kgf, lbf)
147 (15, 33)
294 (30, 66)
Fluid pressure
kPa (kgf/cm
2
, psi)
6,003
(61, 871)
11,273
(115, 1,635)
Содержание 2009 IMPREZA
Страница 18: ...PC 4 Precaution PRECAUTION...
Страница 21: ...NT 4 Note NOTE Lift Rigid rack A Attachment NT 00241 A A Attachment NT 00242 A...
Страница 23: ...NT 6 Note NOTE A Front B Rear 1 Front crossmember 2 Rear differential 1 2 A B NT 00210...
Страница 25: ...NT 8 Note NOTE TIE DOWN HOOK EYE BOLT A Front tie down hook B Rear tie down hook C Eye bolt NT 00213 A B C...
Страница 66: ...PI 22 Pre delivery Inspection PRE DELIVERY INSPECTION...
Страница 112: ...PM 48 A C Filter PERIODIC MAINTENANCE SERVICES...
Страница 219: ...IN H4SO 10 Resonator Chamber INTAKE INDUCTION...
Страница 324: ...ME H4SO 106 Engine Noise MECHANICAL...
Страница 388: ...SP H4SO 6 Accelerator Pedal SPEED CONTROL SYSTEMS...
Страница 395: ...IG H4SO 8 Spark Plug Cord IGNITION...
Страница 418: ...SC H4SO 24 Battery STARTING CHARGING SYSTEMS...
Страница 429: ...EN H4SO diag 12 Electrical Component Location ENGINE DIAGNOSTICS EN 05725 2 1 EN 06168 3 EN 03132 4...
Страница 725: ...EN H4SO diag 308 General Diagnostic Table ENGINE DIAGNOSTICS...
Страница 926: ...GD H4SO 202 Diagnostic Trouble Code DTC Detecting Criteria GENERAL DESCRIPTION...
Страница 1181: ...EX H4DOTC 16 Muffler EXHAUST...
Страница 1212: ...CO H4DOTC 32 Engine Cooling System Trouble in General COOLING...
Страница 1221: ...IG H4DOTC 8 Ignition Coil IGNITION...
Страница 1818: ...GD H4DOTC 230 Diagnostic Trouble Code DTC Detecting Criteria GENERAL DESCRIPTION...
Страница 1824: ...CS 7 AT Shift Lock Control System CONTROL SYSTEMS CS 00874 1 2 CS 00945 CS 00876 3 CS 00359 7 4 CS 00877 5 6...
Страница 2154: ...5MT 82 General Diagnostic Table MANUAL TRANSMISSION AND DIFFERENTIAL...
Страница 2227: ...RS 20 General Diagnostic Table REAR SUSPENSION...
Страница 2364: ...DS 36 General Diagnostic Table DRIVE SHAFT SYSTEM...
Страница 2577: ...BR 10 General Description BRAKE 7 BRAKE BOOSTER 1 Brake booster Tightening torque N m kgf m ft lb T 18 1 8 13 3 BR 00465 1 T...
Страница 2615: ...BR 48 General Diagnostic Table BRAKE...
Страница 2624: ...PB 10 General Diagnostic Table PARKING BRAKE...
Страница 2681: ...PS 58 General Diagnostic Table POWER ASSISTED SYSTEM POWER STEERING...
Страница 2730: ...AC 50 General Diagnostic Table HVAC SYSTEM HEATER VENTILATOR AND A C...
Страница 2940: ...OD diag 28 Diagnostic Procedure with Diagnostic Trouble Code DTC OCCUPANT DETECTION SYSTEM DIAGNOSTICS...
Страница 2961: ...SB 22 Rear Seat Belt SEAT BELT SYSTEM...
Страница 3035: ...COM 6 Horn Switch COMMUNICATION SYSTEM...
Страница 3070: ...GW 36 Wiper Deicer System GLASS WINDOWS MIRRORS...
Страница 3092: ...IDI 22 Clock INSTRUMENTATION DRIVER INFO...
Страница 3158: ...SL 54 Immobilizer Antenna SECURITY AND LOCKS...
Страница 3167: ...SR 10 Sunshade SUNROOF T TOP CONVERTIBLE TOP SUNROOF...
Страница 3240: ...EI 74 Ornament EXTERIOR INTERIOR TRIM...
Страница 3282: ...CC 8 Clutch Switch CRUISE CONTROL SYSTEM 6 Clutch Switch A NOTE For clutch switch refer to CL Ref to CL 27 Clutch Switch...
Страница 3286: ...CC 12 Neutral Position Switch CRUISE CONTROL SYSTEM...
Страница 3311: ...CC diag 26 Diagnostic Procedure with Cancel Code CRUISE CONTROL SYSTEM DIAGNOSTICS...
Страница 3342: ...LAN diag 9 Electrical Component Location LAN SYSTEM DIAGNOSTICS 1 LAN00303 LAN00425 2 LAN00299 7 8 LAN00297 LAN00008 11...
Страница 3421: ...LAN diag 88 General Diagnostic Table LAN SYSTEM DIAGNOSTICS...
Страница 3486: ...WI 67 Remote Engine Start System WIRING SYSTEM...
Страница 3560: ...WI 141 Combination Meter System WIRING SYSTEM 2 LUMINESCENT METER WI 16973 C M LM 01 C M LM 01 i10 CONNECT 22 21 20 19 2 1 40 39...