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 -> SELF-DIAGNOSIS & TESTING -> DIAGNOSTIC TESTS -> G20 -> M30 -> Q45
Vehicle: 1991 Infiniti Q45 4.5 V8 GAS

The warning lamp on the instrument panel will come on when a problem is detected in the ABS braking system. To obtain a self diagnosing result the vehicle must be driven for at least one minute at a minimum speed of 20 mph before self diagnosis is obtained. After vehicle is stopped, the number of LED flashes is counted with the engine running, Fig. .

The LED, which is located in the control unit identifies a problem by the number of flashes, Figs and The LED and warning lamp will stay activated, even after malfunct...

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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, POWER BRAKE UNITS -> DESCRIPTION
Vehicle: 1991 Infiniti Q45 4.5 V8 GAS

The vacuum assist diaphragm assembly multiplies the force exerted on the master cylinder piston in order to increase the hydraulic pressure delivered to the wheel calipers while decreasing the effort necessary to obtain acceptable stopping performance.

Vacuum assist units get their energy by opposing engine vacuum to atmospheric pressure. A piston, cylinder and f...

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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 -> 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, 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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