HYDRAULIC BRAKES 4A – 5
DAEWOO V–121 BL4
DIAGNOSIS
BRAKE SYSTEM TESTING
Brakes should be tested on a dry, clean, reasonably
smooth and level roadway. A true test of brake perfor-
mance cannot be made if the roadway is wet, greasy, or
covered with loose dirt whereby all tires do not grip the
road equally. Testing will also be adversely affected if the
roadway is crowned so as to throw the weight so roughly
that the wheels tend to bounce.
Test the brakes at different vehicle speeds with both light
and heavy pedal pressure; however, avoid locking the
brakes and sliding the tires. Locked brakes and sliding
tires do not indicate brake efficiency since heavily braked,
but turning, wheels will stop the vehicle in less distance
than locked brakes. More tire–to–road friction is present
with a heavily–braked, turning tire than with a sliding tire.
Because of the high deceleration capability, a firmer pedal
may be felt at higher deceleration levels.
There are three major external conditions that affect brake
performance:
S
Tires having unequal contact and grip of the road
will cause unequal braking. Tires must be equally
inflated, and the tread pattern of the right and the
left tires must be approximately equal.
S
Unequal loading of the vehicle can affect the brake
performance since the most heavily loaded wheels
require more braking power, and thus more braking
effort, than the others.
S
Misalignment of the wheels, particularly conditions
of excessive camber and caster, will cause the
brakes to pull to one side.
To check for brake fluid leaks, hold constant foot pressure
on the pedal with the engine running at idle and the shift
lever in NEUTRAL. If the pedal gradually falls away with
the constant pressure, the hydraulic system may be leak-
ing. Perform a visual check to confirm any suspected
leaks.
Check the master cylinder fluid level. While a slight drop
in the reservoir level results from normal lining wear, an ab-
normally low level indicates a leak in the system. The hy-
draulic system may be leaking either internally or external-
ly. Refer to the procedure below to check the master
cylinder. Also, the system may appear to pass this test
while still having a slight leak. If the fluid level is normal,
check the vacuum booster pushrod length. If an incorrect
pushrod length is found, adjust or replace the rod.
Check themaster cylinder using the following procedure:
S
Check for a cracked master cylinder casting or
brake fluid leaking around the master cylinder.
Leaks are indicated only if there is at least one drop
of fluid. A damp condition is not abnormal.
S
Check for a binding pedal linkage and for an incor-
rect pushrod length. If both of these parts are in
satisfactory condition, disassemble the master cyl-
inder and check for an elongated or swollen primary
cylinder or piston seals. If swollen seals are found,
substandard or contaminated brake fluid should be
suspected. If contaminated brake fluid is found, all
the components should be disassembled and
cleaned, and all the rubber components should be
replaced. All of the pipes must also be flushed.
Improper brake fluid, or mineral oil or water in the fluid,
may cause the brake fluid to boil or cause deterioration of
the rubber components. If the primary piston cups in the
master cylinder are swollen, then the rubber parts have
deteriorated. This deterioration may also be evidenced by
swollen wheel cylinder piston seals on the drum brake
wheels.
If deterioration of rubber is evident, disassemble all the hy-
draulic parts and wash the parts with alcohol. Dry these
parts with compressed air before reassembly to keep alco-
hol out of the system. Replace all the rubber parts in the
system, including the hoses. Also, when working on the
brake mechanisms, check for fluid on the linings. If exces-
sive fluid is found, replace the linings.
If the master cylinder piston seals are in satisfactory condi-
tion, check for leaks or excessive heat conditions. If these
conditions are not found, drain the fluid, flush the master
cylinder with brake fluid, refill the master cylinder, and
bleed the system. Refer to”Manual Bleeding the Brakes”
or”Pressure Bleeding the Brakes” in this section.
BRAKE HOSE INSPECTION
The hydraulic brake hoses should be inspected at least
twice a year. The brake hose assembly should be checked
for road hazard damage, cracks, chafing of the outer cov-
er, and for leaks or blisters. Inspect the hoses for proper
routing and mounting. A brake hose that rubs on a suspen-
sion component will wear and eventually fail. A light and
a mirror may be needed for an adequate inspection. If any
of the above conditions are observed on the brake hose,
adjust or replace the hose as necessary.
WARNING LAMP OPERATION
This brake system uses a BRAKE warning lamp located
in the instrument panel cluster. When the ignition switch
is in the START position, the BRAKE warning lamp should
glow and go OFF when the ignition switch returns to the
RUN position.
The following conditions will activate the BRAKE lamp:
S
Parking brake applied. The light should be ON
whenever the parking brake is applied and the igni-
tion switch is ON.
S
Low fluid level. A low fluid level in the master cylin-
der will turn the BRAKE lamp ON.
S
As a test of the lamp circuit, vehicles with antilock
brakes will momentarily illuminate the lamp for
about 4 seconds when the ignition
Содержание NUBIRA
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Страница 28: ...9D 2IWIPERS WASHER SYSTEMS DAEWOO V 121 BL4 SCHEMATIC AND ROUTING DIAGRAMS WIPERS AND WASHER SYSTEM NOTCHBACK...
Страница 29: ...WIPERS WASHER SYSTEMS 9D 3 DAEWOO V 121 BL4 WIPERS AND WASHER SYSTEM HATCHBACK...
Страница 58: ...DOORS 9P 3 DAEWOO V 121 BL4 SCHEMATIC AND ROUTING DIAGRAMS POWER DOOR LOCKS...
Страница 59: ...9P 4IDOORS DAEWOO V 121 BL4 POWER WINDOWS FRONT AND REAR...
Страница 92: ...9Q 2IROOF DAEWOO V 121 BL4 SCHEMATIC AND ROUTING DIAGRAMS POWER SUNROOF SYSTEM...
Страница 229: ...ANTILOCK BRAKE SYSTEM 4F 5 DAEWOO V 121 BL4 SCHEMATIC AND ROUTING DIAGRAMS ABS CIRCUIT 1 OF 4...
Страница 230: ...4F 6IANTILOCK BRAKE SYSTEM DAEWOO V 121 BL4 ABS CIRCUIT 2 OF 4...
Страница 231: ...ANTILOCK BRAKE SYSTEM 4F 7 DAEWOO V 121 BL4 ABS CIRCUIT 3 OF 4...
Страница 232: ...4F 8IANTILOCK BRAKE SYSTEM DAEWOO V 121 BL4 ABS CIRCUIT 4 OF 4...
Страница 234: ...4F 10IANTILOCK BRAKE SYSTEM DAEWOO V 121 BL4 Pin Circuit Color Signal Name B11 Not Used B12 BATT ORN Battery...
Страница 252: ...5C0 6ICLUTCH DAEWOO V 121 BL4 1 Flywheel 2 Clutch Disc 3 Pressure Plate 4 Release Bearing...
Страница 272: ...SECTION 2 POSITION OF CONNECTORS AND GROUNDS...
Страница 275: ...2 4WPOSITION OF CONNECTORS AND GROUNDS 2 WIRING HARNESS CONNECTOR GROUND LOCATION 1 W H FRONT FRONT BUMPER...
Страница 276: ...POSITION OF CONNECTORS AND GROUNDSW2 5 2 ENGINE CONTROL BATTERY S 2 0 DOHC ENGINE...
Страница 277: ...2 6WPOSITION OF CONNECTORS AND GROUNDS 3 INSTRUMENT PANEL INSIDE...
Страница 278: ...POSITION OF CONNECTORS AND GROUNDSW2 7 4 AIR BAG INSTRUMENT PANEL 5 BODY...
Страница 279: ...2 8WPOSITION OF CONNECTORS AND GROUNDS 6 W H DOOR 1 Front Door 2 Rear Door...
Страница 280: ...POSITION OF CONNECTORS AND GROUNDSW2 9 7 ABS WHEEL SPEED SENSOR 1 With Sun Roof 2 Without Sun Roof...
Страница 281: ...2 10WPOSITION OF CONNECTORS AND GROUNDS 8 ABS MODULE WHEEL SPEED SENSOR...
Страница 282: ...POSITION OF CONNECTORS AND GROUNDSW2 11 9 REAR 10 FUEL TANK TRUNK LID...
Страница 283: ...2 12WPOSITION OF CONNECTORS AND GROUNDS 11 SPLICE PACK S201 BROWN S202 BLUE S203 BROWN S204 GRAY S205 RED S206 BLUE...
Страница 284: ...POSITION OF CONNECTORS AND GROUNDSW2 13 S207 BLUE S208 WHITE S301 BLUE N B S301 BLUE H B S301 BLUE S W S302 BLACK...
Страница 285: ...2 14WPOSITION OF CONNECTORS AND GROUNDS S303 BLACK N B H B S303 BLACK S W...
Страница 286: ...SECTION 3 WIRING DIAGRAM FOR POWER SUPPLIES...
Страница 287: ...3 2WWIRING DIAGRAM FOR POWER SUPPLIES 1 IGNITION SWITCH CIRCUIT...
Страница 288: ...WIRING DIAGRAM FOR POWER SUPPLIESW3 3 2 30 Ter BAT POWER SUPPLY CIRCUIT PASSENGER ROOM FUSE BOX...
Страница 289: ...3 4WWIRING DIAGRAM FOR POWER SUPPLIES 3 15A IGN 2 15C ACC POWER SUPPLY CIRCUIT PASSENGER ROOM FUSE BOX...
Страница 290: ...WIRING DIAGRAM FOR POWER SUPPLIESW3 5 4 ENGINE ROOM FUSE RELAY CIRCUIT...
Страница 291: ...3 6WWIRING DIAGRAM FOR POWER SUPPLIES...
Страница 292: ...WIRING DIAGRAM FOR POWER SUPPLIESW3 7...
Страница 293: ...SECTION 4 USAGE AND CAPACITY OF FUSES...
Страница 297: ...SECTION 5 ELECTRICAL WIRING DIAGRAMS...
Страница 301: ...9A 2IBODY WIRING SYSTEM DAEWOO V 121 BL4 POWER DISTRIBUTION SCHEMATIC...
Страница 302: ...BODY WIRING SYSTEM 9A 3 DAEWOO V 121 BL4...
Страница 303: ...9A 4IBODY WIRING SYSTEM DAEWOO V 121 BL4 FUSE BLOCK LOCATOR ENGINE FUSE BLOCK LOCATOR PASSENGER COMPARTMENT...
Страница 306: ...BODY WIRING SYSTEM 9A 7 DAEWOO V 121 BL4 REAR HARNESS ROUTING...
Страница 307: ...9A 8IBODY WIRING SYSTEM DAEWOO V 121 BL4 FRONT HARNESS ROUTING...
Страница 308: ...BODY WIRING SYSTEM 9A 9 DAEWOO V 121 BL4 FLOOR HARNESS ROUTING...
Страница 309: ...9A 10IBODY WIRING SYSTEM DAEWOO V 121 BL4 INSTRUMENT HARNESS ROUTING...
Страница 310: ...BODY WIRING SYSTEM 9A 11 DAEWOO V 121 BL4 DOOR HARNESS ROUTING...
Страница 313: ...LIGHTING SYSTEMS 9B 3 DAEWOO V 121 BL4 SCHEMATIC AND ROUTING DIAGRAMS HEADLAMPS ON REMINDER CHIME CIRCUIT...
Страница 314: ...9B 4ILIGHTING SYSTEMS DAEWOO V 121 BL4 PARKING TAIL POSITION AND LICENSE LAMPS CIRCUIT...
Страница 315: ...LIGHTING SYSTEMS 9B 5 DAEWOO V 121 BL4 TURN AND HAZARD LAMPS CIRCUIT...
Страница 316: ...9B 6ILIGHTING SYSTEMS DAEWOO V 121 BL4 BRAKE AND BACKUP LAMPS CIRCUIT...
Страница 317: ...LIGHTING SYSTEMS 9B 7 DAEWOO V 121 BL4 INTERIOR COURTESY LAMP AND LUGGAGE COMPARTMENT LAMP CIRCUIT...
Страница 318: ...9B 8ILIGHTING SYSTEMS DAEWOO V 121 BL4 HEADLAMPS CIRCUIT...
Страница 319: ...LIGHTING SYSTEMS 9B 9 DAEWOO V 121 BL4 DAYTIME RUNNING LAMPS CIRCUIT...
Страница 320: ...9B 10ILIGHTING SYSTEMS DAEWOO V 121 BL4 FOG LAMPS CIRCUIT...
Страница 342: ...9C 2IHORNS DAEWOO V 121 BL4 SCHEMATIC AND ROUTING DIAGRAMS HORN WIRING SYSTEM...
Страница 344: ...9C 4IHORNS DAEWOO V 121 BL4 2 Connect the electrical connector 3 Connect the negative battery cable...
Страница 347: ...9F 2IAUDIO SYSTEMS DAEWOO V 121 BL4 SCHEMATIC AND ROUTING DIAGRAMS AUDIO SYSTEM CIRCUIT...
Страница 365: ...CRUISE CONRTOL SYSTEM 9U 3 DAEWOO V 121 BL4 CRUISE CONTROL SYSTEM AUTOMATIC TRANSAXLE 2 OF 2...
Страница 366: ...9U 4ICRUISE CONRTOL SYSTEM DAEWOO V 121 BL4 CRUISE CONTROL SYSTEM MANUAL TRANSAXLE 1 OF 2...
Страница 367: ...CRUISE CONRTOL SYSTEM 9U 5 DAEWOO V 121 BL4 CRUISE CONTROL SYSTEM MANUAL TRANSAXLE 2 OF 2...
Страница 407: ...GENERAL INFORMATION 0B 25 DAEWOO V 121 BL4...
Страница 408: ...0B 26IGENERAL INFORMATION DAEWOO V 121 BL4 Vehicle Lifting Points...
Страница 427: ...1C 8IDOHC ENGINE MECHANICAL DAEWOO V 121 BL4 COMPONENT LOCATOR UPPER END...
Страница 429: ...1C 10IDOHC ENGINE MECHANICAL DAEWOO V 121 BL4 LOWER END...
Страница 520: ...ENGINE CONTROLS 1F 15 DAEWOO V 121 BL4 SCHEMATIC AND ROUTING DIAGRAMS PCM ECM WIRING DIAGRAM 1 OF 6 IPCM 6KD ISFI 6TD...
Страница 521: ...1F 16IENGINE CONTROLS DAEWOO V 121 BL4 PCM ECM WIRING DIAGRAM 2 OF 6 IPCM 6KD ISFI 6TD...
Страница 522: ...ENGINE CONTROLS 1F 17 DAEWOO V 121 BL4 PCM ECM WIRING DIAGRAM 3 OF 6 IPCM 6KD ISFI 6TD...
Страница 523: ...1F 18IENGINE CONTROLS DAEWOO V 121 BL4 PCM ECM WIRING DIAGRAM 4 OF 6 IPCM 6KD ISFI 6TD...
Страница 524: ...ENGINE CONTROLS 1F 19 DAEWOO V 121 BL4 PCM ECM WIRING DIAGRAM 5 OF 6 IPCM 6KD ISFI 6TD...
Страница 525: ...1F 20IENGINE CONTROLS DAEWOO V 121 BL4 PCM ECM WIRING DIAGRAM 6 OF 6 IPCM 6KD ISFI 6TD...
Страница 526: ...ENGINE CONTROLS 1F 21 DAEWOO V 121 BL4 CONNECTOR END VIEW...
Страница 527: ...1F 22IENGINE CONTROLS DAEWOO V 121 BL4...
Страница 528: ...ENGINE CONTROLS 1F 23 DAEWOO V 121 BL4...
Страница 529: ...1F 24IENGINE CONTROLS DAEWOO V 121 BL4...
Страница 530: ...ENGINE CONTROLS 1F 25 DAEWOO V 121 BL4...
Страница 531: ...1F 26IENGINE CONTROLS DAEWOO V 121 BL4 COMPONENT LOCATOR...
Страница 541: ...1F 36IENGINE CONTROLS DAEWOO V 121 BL4...
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Страница 669: ...4T40 E AUTOMATIC TRANSAXLE 5A 15 DAEWOO V 121 BL4 SCHEMATIC AND ROUTING DIAGRAMS POWERTRAIN CONTROL MODULE 1 OF 3...
Страница 670: ...5A 16I4T40 E AUTOMATIC TRANSAXLE DAEWOO V 121 BL4 POWERTRAIN CONTROL MODULE 2 OF 3...
Страница 671: ...4T40 E AUTOMATIC TRANSAXLE 5A 17 DAEWOO V 121 BL4 POWERTRAIN CONTROL MODULE 3 OF 3...
Страница 681: ...FIVE SPEED MANUAL TRANSAXLE 5B 9 DAEWOO V 121 BL4 COMPONENT LOCATORS GEARS AND CASE...
Страница 684: ...5B 12IFIVE SPEED MANUAL TRANSAXLE DAEWOO V 121 BL4 SHIFT LINKAGE...