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Disc & Drum: Other Nissan Quest I

Mechanical - Hydraulic 2 illustrations ~666 words

BLEEDING PROCEDURES

Note. Check fluid level in master cylinder frequently during bleeding procedure.

Bleed brake system in proper sequence. See BRAKELINE BLEEDING SEQUENCE table.

Application(1) Sequence
QuestRR, LF, LR, RF
(1) On models with Load-Sensing Proportioning Valve (LSPV), bleed LSPV before bleeding wheel cylinders.
(1)On models with Load-Sensing Proportioning Valve (LSPV), bleed LSPV before bleeding wheel cylinders.

BRAKELINE BLEEDING SEQUENCE

POWER BRAKE UNIT OUTPUT ROD

  1. Attach a hand-held vacuum pump to power brake unit supply port. (Scheme 4) Apply 20 in. Hg vacuum to power brake unit. Measure length of output rod extending from power brake unit housing.
  2. See POWER BRAKE UNIT OUTPUT ROD LENGTH SPECIFICATIONS table. Adjust output rod length if necessary. If output rod length cannot be adjusted properly, replace power brake unit.
ApplicationIn. (mm)
Quest.40-.41 (10.3-10.5)

POWER BRAKE UNIT OUTPUT ROD LENGTH SPECS

Scheme 4

Scheme 4
Scheme 4

BRAKE PEDAL HEIGHT & FREE PLAY

  1. Measure pedal height from pressure face of pedal pad to floor pan insulator, without carpet. See BRAKE PEDAL HEIGHT SPECIFICATIONS table.
  2. To adjust pedal height, loosen brake booster input rod lock nut, and rotate input rod to attain proper height. Tighten lock nut, and adjust stoplight switch. Ensure pedal free play is .04-.12" (1.0-3.0 mm).
ApplicationPedal Height In. (mm)
Quest7.7-8.0 (195-205)

BRAKE PEDAL HEIGHT SPECIFICATIONS

LOAD-SENSING PROPORTIONING VALVE (LSPV)

Note. If pressure cannot be adjusted to specifications, replace entire valve assembly.

ApplicationFront Brake Pressure psi (kg/cm 2 )Rear Brake Pressure psi (kg/cm 2 )
Quest853 (60)478-825 (34-58)
Quest1706 (120)813-1064 (57-75)

LSPV PRESSURE SPECIFICATIONS

  1. Ensure vehicle is in unladen condition. Have one person sit in driver's seat. To stabilize suspension deflection, have one person sit in rear of vehicle and then exit vehicle slowly.
  2. Attach a lever to LSPV stopper bolt. (Scheme 5) Adjust spring length to about 6.0" (152.5 mm). Attach one pressure gauge to front brake bleeder and another pressure gauge to rear brake bleeder.
  3. Bleed air from front and rear bleeders. Depress brake pedal until front brake pressure reading is achieved. Check rear brake pressure. See LSPV PRESSURE SPECIFICATIONS table.
  4. If pressure readings are not as specified, adjust spring bracket. (Scheme 5) Repeat test. If pressure readings are still not as specified, replace LSPV and repeat test.

Scheme 5

Scheme 5
Scheme 5

PARKING BRAKE

ApplicationNotches
Quest11-12

PARKING BRAKE LEVER STROKE SPECIFICATIONS

  1. Raise and support rear of vehicle. Apply parking brake using force of 44 lbs. (20 kg). Check lever stroke. See PARKING BRAKE LEVER STROKE SPECIFICATIONS table. For vehicles with rear disc-in-drum type brakes, adjust rear brake shoe clearance before adjusting parking brake. See REAR BRAKE SHOE CLEARANCE under ADJUSTMENTS.
  2. Use adjusting nut to adjust equalizer link until rear wheels are locked. Release parking brake. Ensure rear wheels turn freely. After adjustment, brakes should operate smoothly without noise or drag.

REAR BRAKE SHOE CLEARANCE

  1. Set shoe adjustment assembly so clearance between brake drum inside diameter and brake shoes outside diameter is as specified. See BRAKE SHOE INSTALLATION CLEARANCE SPECIFICATIONS table.
  2. After brake drum installation, depress brake pedal to center shoes. Check pedal travel. Rotate brake drum to verify free movement.
ApplicationIn. (mm)
Quest.014-.022 (.36-.56)

BRAKE SHOE INSTALLATION CLEARANCE SPECIFICATIONS

STOPLIGHT SWITCH & AUTOMATIC SPEED CONTROL DEVICE SWITCH

  1. Both switches are located below dash panel, at brake pedal bracket.Adjust brake pedal height. See BRAKE PEDAL HEIGHT & FREE PLAY.
  2. Check clearance and position of switches. Clearance between brake pedal stopper rubber and threaded end of switch should be .01-.04" (0.3-1.0 mm). To adjust, loosen lock nut and turn switch body. After adjustment, tighten lock nut.

Note. See LOAD-SENSING PROPORTIONING VALVE (LSPV) under ADJUSTMENTS.

POWER BRAKE UNIT

Note. Determine whether source of problem is in power brake unit or check valve. Always inspect check valve.

DO NOT disassemble power brake unit. After air-tight and operational tests, replace complete assembly if problem is determined to be in power brake unit.

Air-Tight Check

  1. Start engine, and operate it for 2 minutes. Turn engine off. Depress brake pedal several times. If brake pedal height rises gradually on successive pedal depressions, go to next step. If pedal does not rise on successive pumps, check for air leak.
  2. Start engine. Depress brake pedal and turn engine off. Hold brake pedal down for 30 seconds. If brake pedal height does not change, power brake unit is air tight. If pedal height changes, check for air leak.

FRONT BRAKE ROTOR

Note. For exploded view of hub assembly, see SUSPENSION - FRONT article in the SUSPENSION section.

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