1991 Infiniti Q45 Brake Service (ONLINE REPAIR MANUALS)

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BRAKE SERVICE PROCEDURES FOR 1991 Infiniti Q45 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Infiniti Q45 cars and light trucks from 1990+.

INFINITI, ANTI-LOCK BRAKES -> COMPONENT REPLACEMENT -> ACTUATOR -> ACTUATOR RELAYS -> G20 -> SPEED SENSORS
Vehicle: 1991 Infiniti Q45 4.5 V8 GAS

SPEED SENSORS

When replacing speed sensors refer to Figs. through .

ACTUATOR

  • Disable airbag system as outlined under "Airbag System Disarming."
  • Drain brake fluid by attaching hose to each wheel cylinder, then open each bleeder valve while depressing brake pedal.
  • Mark each brake pipe connector for proper installation.
  • Disconnect electrical connector, brake pipes, then attaching nuts.
  • Remove actuator.
  • Re...

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BRAKE SERVICE PROCEDURES FOR 1991 Infiniti Q45 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Infiniti Q45 cars and light trucks from 1990+.

INFINITI, HYDRAULIC BRAKE SYSTEM -> PEDAL HEIGHT ADJUSTMENT
Vehicle: 1991 Infiniti Q45 4.5 V8 GAS

Refer to "Dis... "

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BRAKE SERVICE PROCEDURES FOR 1991 Infiniti Q45 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Infiniti Q45 cars and light trucks from 1990+.

INFINITI, HYDRAULIC BRAKE SYSTEM -> PROPORTIONING VALVE -> INSPECTION
Vehicle: 1991 Infiniti Q45 4.5 V8 GAS

INSPECTION

  • On ABS models, disconnect harness connectors from ABS actuator.
  • On all models, connect brake fluid pressure tool No. KV991V0010 or equivalent to air bleeder of front and rear brakes on either LH or RH side. Fig. .
  • Bleed air from tool.
  • Depress brake pedal and compare pr...

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BRAKE SERVICE PROCEDURES FOR 1991 Infiniti Q45 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Infiniti Q45 cars and light trucks from 1990+.

INFINITI, ANTI-LOCK BRAKES -> TROUBLESHOOTING
Vehicle: 1991 Infiniti Q45 4.5 V8 GAS

Refer to Figs. and , for system symptom ch...

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BRAKE SERVICE PROCEDURES FOR 1991 Infiniti Q45 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Infiniti Q45 cars and light trucks from 1990+.

INFINITI, HYDRAULIC BRAKE SYSTEM -> MASTER CYLINDER REPLACEMENT -> ASSEMBLY -> DISASSEMBLY -> G20 -> INSPECTION -> M30 & Q45 -> MASTER CYLINDER OVERHAUL
Vehicle: 1991 Infiniti Q45 4.5 V8 GAS

  • Connect tube to bleeder valve.
  • Open bleeder valve, drain fluid by depressing brake pedal until master cylinder is empty.
  • Remove brake line flare nuts, master cylinder attaching nuts, then master cylinder.
  • Reverse procedure to install noting the following:
    • Torque master cylinder attaching nuts to 5.8-8.0 ft. lbs.
    • Torque flare nuts to 11-13 ft.lbs.
    • Bleed air from system as outlined in "Bleeding System."

MASTER CYLINDER OVERHAUL

For exploded view of master cylinder, refer to Figs. through .

DISASSEMBLY

M30 & Q45
  • Lightly push valve into cylinder, then remove stopper, Fig....

CLICK HERE TO GET FULL ACCESS TO 1991 Infiniti Q45 BRAKE SERVICE PROCEDURES

BRAKE SERVICE PROCEDURES FOR 1991 Infiniti Q45 AUTOMOBILES

Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 Infiniti Q45 cars and light trucks from 1990+.

INFINITI, DISC BRAKES -> GENERAL INFORMATION -> BRAKE SYSTEM BLEED -> CALIPER -> Cylinder Body -> INSPECTION -> Piston -> PROPORTIONING VALVE -> ROTOR -> Runout -> Surface -> Thickness
Vehicle: 1991 Infiniti Q45 4.5 V8 GAS

BRAKE SYSTEM BLEED

  • Observe following precautions when bleeding brake system.
    • Carefully monitor brake fluid level at master cylinder during bleeding procedure.
    • Fill reservoir with new Dot 3 brake fluid.
    • Ensure fluid level is full at all times.
  • Connect a transparent vinyl tube to air bleeder valve.
  • Fully depress brake pedal several times.
  • With brake pedal depressed, open air bleeder valve to release air.
  • Release brake pedal slowly.
  • Repeat steps 3 through 5 until clear brake fluid comes out of air bleeder valve.
  • On models less ABS, bleed system in following order:
    • Left rear caliper.
    • Right ...

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