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Disc & Drum: Other Mazda MX-6 I

Mechanical - Hydraulic 1 illustration ~826 words

BLEEDING BRAKE SYSTEM

ApplicationSequence
MX-6, 626Longest Line First

BRAKE LINE BLEEDING SEQUENCE

MASTER CYLINDER PUSH ROD

Note. Push rod has an adjustment screw to maintain correct distance between booster push rod and master cylinder piston. If push rod is adjusted too long, it prevents master cylinder piston from completely releasing hydraulic pressure, causing brakes to drag. If push rod is adjusted too short, it causes excessive pedal travel and an undesirable clunk in booster area.

  1. Place Adjustment Gauge (49-F043-001) onto master cylinder. Turn screw on adjuster gauge until it contacts piston. Remove adjuster gauge. Apply 19.7 in. Hg to power brake unit.
  2. Invert adjuster gauge and place it on power brake unit. Adjust push rod on power brake unit until there is no clearance between push rod and adjuster gauge screw.

REAR BRAKE SHOES

Note. Self-adjusting rear brakes only require manual adjustment when brake shoe is replaced or operating lever is moved during service operations.

  1. Raise and support rear of vehicle. Remove rear wheel assemblies. Release parking brake. Remove lock nut from axle shaft. Remove brake drum. Insert screwdriver between adjusting plate and quadrant. Twist screwdriver to disengage teeth. (Scheme 9)
  2. Push quadrant adjusting lever toward backing plate. Install brake drum. Install NEW lock nut and secure by crimping. Operate parking brake a few times to reset adjuster. Adjust parking brake.

Scheme 9

Scheme 9
Scheme 9

PARKING/EMERGENCY BRAKE

  1. On models with rear disc brakes, depress brake pedal several times. On models with rear drum brakes, start engine and depress brake pedal several times while vehicle is moving in reverse. Stop engine.
  2. Pull parking brake lever with a force of 22 lbs. (10 kg). If stroke is 5-7 notches, parking brake is properly adjusted. If stroke is not as specified, raise and support rear of vehicle. Release parking brake lever.
  3. Rotate cable adjusting nut at lever end of cable, located under console cover, until stroke is within specification. Ensure rear brakes do not drag. Ensure parking brake warning light illuminates when brake lever is pulled one notch.

BRAKE PEDAL FREE PLAY

With engine off, depress pedal a few times to eliminate vacuum. Depress brake pedal by hand and check pedal free play. See BRAKE PEDAL FREE PLAY SPECIFICATIONS table. Adjust play by loosening push rod lock nut. Turn push rod until correct free play is obtained. Tighten push rod lock nut to 18-25 ft. lbs. (24-34 N.m).

ApplicationIn. (mm)
MX-6 & 626.16-.47 (4-12)

BRAKE PEDAL FREE PLAY SPECIFICATIONS

BRAKE PEDAL HEIGHT & STOPLIGHT SWITCH

  1. Released pedal height is measured from carpet surface on vertical portion of firewall to pedal pad center. Disconnect stoplight switch electrical connector. Loosen lock nut on stoplight switch. Rotate switch away from pedal. Loosen push rod lock nut. Rotate push rod until correct pedal height is obtained. See BRAKE PEDAL HEIGHT SPECIFICATIONS table.
  2. Adjust pedal free play. See BRAKE PEDAL FREE PLAY under ADJUSTMENTS. Tighten push rod lock nut to 18-25 ft. lbs. (24-34 N.m).
  3. Rotate stoplight switch until it contacts pedal and then rotate an additional 1/2 turn. Tighten stoplight switch lock nut to 10-13 ft. lbs. (14-18 N.m). Reconnect stoplight switch electrical connector.
  4. Applied pedal height is measured from angled portion of firewall (without carpet) to pedal pad center. Start engine. Depress brake pedal with 132 lbs. (60 kg) pressure.
  5. Measure applied pedal height. See BRAKE PEDAL HEIGHT SPECIFICATIONS table. If distance is not as specified, check for air in system, rear brake adjustment or worn shoes or pads.
ApplicationIn. (mm)
Pedal Released7.5-7.7 (191-196)
Pedal Applied (1)3.3 (85)
(1) Minimum height.
(1)Minimum height.

BRAKE PEDAL HEIGHT SPECIFICATIONS

PROPORTIONING VALVE

  1. Connect 2 pressure gauges to proportioning valve. One to input port and other to output port. Bleed brake system. See BLEEDING BRAKE SYSTEM. Depress brake pedal until pressure gauge reads as specified and check output pressure. See PROPORTIONING VALVE PRESSURE SPECIFICATIONS table.
  2. Depress brake pedal again, applying additional pressure. Recheck output pressure. See PROPORTIONING VALVE PRESSURE SPECIFICATIONS table. If output pressure is not as specified, replace valve.
ApplicationInlet Pressure psi (kg/cm 2 )Outlet Pressure psi (kg/cm 2 )
With ABS427 (30)399-455 (28-32)
853 (60)512-598 (36-42)
Without ABS356 (25)328-384 (23-27)
853 (60)462-547 (33-39)

PROPORTIONING VALVE PRESSURE SPECIFICATIONS

POWER BRAKE UNIT

  1. With engine off, depress brake pedal several times. Press and hold brake pedal and start engine. If brake pedal moves down slightly immediately after engine starts, power brake unit is operating. If brake pedal does not move as specified, go to next step.
  2. Run engine for 1-2 minutes. Stop engine. Press brake pedal several times and note if first pedal stroke is longer than subsequent strokes. If first pedal stroke is longer than subsequent strokes, power brake unit is operating. If length of strokes is equal, test check valve and vacuum hose between vacuum source and power brake unit. Repair as necessary, and go to next step.
  3. Start engine. Press and hold brake pedal. Stop engine. Hold pedal down for about 30 seconds. If pedal height remains at same height, power brake unit is operating. If pedal height recedes, test check valve and vacuum hose between vacuum source and power brake unit. Repair as necessary.

REAR AXLE BEARING & OIL SEAL

Note. For information on models with sealed wheel bearings, see WHEEL BEARING in SUSPENSION - REAR article in the SUSPENSION section.

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