Mazda 323/626/929/GLC/MX-6/RX-7 1978-1989

Adjustments

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DISC BRAKES



See Figure 1

Disc brakes are self-adjusting by design. As the brake pads and discs wear, fluid pressure compensates for the amount of wear. Because this action causes the fluid level to go down, its level should be checked and replenished as often as is necessary.



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Fig. Fig. 1: Common tandem hydraulic brake system

DRUM BRAKES



Rear Wheel Drive Vehicles
ALL 1978-80 MODELS AND 1981 GLC WAGON

See Figure 2

  1. Raise and securely support the vehicle. Make sure the parking brake is fully released.
  2.  
  3. Loosen the anchor pin locknut, then hold the locknut and turn the anchor pin in the indicated direction until the wheel locks.
  4.  

The anchor pins on each wheel are turned in opposite directions. On the right side, the forward pin turns clockwise, and the rear pin counterclockwise. On the left side, the forward pin turns counterclockwise, and the rear pin clockwise.

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Fig. Fig. 2: Adjusting the rear drum brakes-1978-80 models

  1. Turn the anchor pin back just until the wheel turns freely. Hold the adjustment and tighten the locknut.
  2.  
  3. Repeat for the other brake shoe on the same wheel, then adjust both shoes on the other rear wheel.
  4.  

MOST 1981 AND LATER MODELS

See Figure 3

These rear drum brakes are self-adjusting and normally only require a manual adjustment after the brake shoes have been replaced, or when the length of the adjusting rod has otherwise been altered.

  1. Block the front wheels, raise the car, and safely support it with jackstands.
  2.  
  3. Release the parking brake completely.
  4.  
  5. Remove the adjusting hole plugs from the backing plate.
  6.  
  7. Insert a screwdriver into hole A . Engage the star wheel with a screwdriver, then turn it in the direction of the arrow stamped on the backing plate until the brake shoes are fully expanded and the wheel will not turn.
  8.  



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Fig. Fig. 3: Drum brake adjustment is made through holes A and B of the backing plate-1981-85 RWD models

  1. Insert a screwdriver into hole B . Push the pawl lever of the self-adjuster to turn the adjusting wheel in the reverse direction of the arrow.
  2.  
  3. Back off the star wheel about 3-4 notches. The wheel should rotate freely, without dragging. If it does not, turn the adjuster an additional notch.
  4.  
  5. Fit the plugs into the adjusting hole, then repeat the adjusting procedure for the other side rear brake shoes.
  6.  

Front Wheel Drive Vehicles

Front wheel drive models are equipped with self-adjusting drum brakes for which no external adjustment is required.

BRAKE PEDAL



1978-82 GLC and 1979-82 626

See Figure 4

  1. Detach the wiring from the brake light switch terminals.
  2.  
  3. Loosen the locknut on the switch.
  4.  
  5. Turn the switch until the distance between the pedal and the floor is:

    GLC with rear wheel drive and manual transmission: 7.50 in. (190mm)
     
    GLC with rear wheel drive and automatic transmission: 7.67 in. (195mm)
     
    GLC with front wheel drive: 8.50 in. (215mm)
     
    626: 8.67 in. (220mm)
     

  6.  

  1. Tighten the locknut on the switch, then attach the wiring.
  2.  
  3. Loosen the locknut located on the pushrod.
  4.  



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Fig. Fig. 4: Brake pedal and related components-1978-82 GLC and 626

  1. Rotate the pushrod until 0.28-0.35 in. (7-9mm) of pedal free travel is obtained.
  2.  
  3. Tighten the pushrod locknut.
  4.  

1983-87 626
  1. Remove the blower duct. Measure the pedal height (distance from the center of the brake pedal's upper surface to the firewall, behind the insulation). It should be 8.43-8.62 in. (214-219mm).
  2.  
  3. If adjustment is necessary, detach the brake lamp switch electrical connector, then loosen the switch locknut. Turn the switch so that it does not contact the pedal.
  4.  
  5. Loosen the locknut, then turn the operating rod until the pedal height is correct.
  6.  
  7. Depress the brake pedal several times, in order to eliminate vacuum in the line.
  8.  
  9. Gently depress the pedal by hand and check the free-play. If necessary, turn the operating rod until the pedal free-play is 0.28-0.35 in. (7-9mm). Tighten the operating rod locknut.
  10.  
  11. Turn the brake lamp switch until it contacts the pedal, and then an additional 1 / 2 turn. Tighten the locknut, then attach the electrical connector. Install the blower duct.
  12.  

1983-85 GLC and 1986-87 323
  1. Remove the under cover from the instrument panel. Detach the brake lamp switch electrical connector.
  2.  
  3. Loosen the brake lamp switch locknut, then turn the switch outward until the pedal does not touch it.
  4.  
  5. Loosen the operating rod locknut, then turn the rod to adjust the pedal height to 8.46-8.66 in. (215-220mm) on the GLC, or 8.62-8.82 in. (219-224mm) on the 323. Measure from the center of the brake pedal's upper surface to the firewall (behind the insulation). Fasten the position of the operating rod with the locknut.
  6.  
  7. Screw the brake lamp switch inward until it just touches the pedal, and then an additional 1 / 2 turn.
  8.  
  9. Check the free-play in the brake pedal. It should be 0.28-0.35 in. (7-9mm) on the GLC, or 0.16-0.28 in. (4-7mm) on the 323. If necessary, adjust the free-play by loosening the operating rod locknut and turning the rod. Tighten the locknut.
  10.  
  11. Fasten the brake lamp switch electrical connector. Install the instrument panel under cover.
  12.  

1988-89 323, 626, MX-6 and 929

See Figure 5

Measure the pedal height (distance from the center of the brake pedal's upper surface to the firewall, behind the insulation). It should be 8.43-8.62 in. (214-219mm) for 323s, 8.54-8.74 in. (217-222mm) for 626/MX-6s, 8.23-8.43 in. (209-214mm) for 929s equipped with a manual transmission, or 8.03-8.23 in. (204-209mm) for 929s with an automatic transmission. If the distance is not as specified, perform the following adjustments (see illustration):

  1. Detach the electrical connector from brake light switch A .
  2.  
  3. Loosen locknut B and turn switch A until it does not contact the pedal.
  4.  
  5. Loosen locknut D and turn operating rod C to adjust the pedal height as specified.
  6.  



Click image to see an enlarged view

Fig. Fig. 5: Brake pedal height and free-play adjustment-1988-89 323, 626, MX-6 and 929; 1979-89 RX-7

  1. Depress the brake pedal several times by hand and check the free-play. (Free-play is the amount of brake pedal travel before the brake booster begins to operate.) There should be 0.16-0.28 in. (4.0-7.0mm) of play. Loosen the operating rod locknut, then turn the rod to adjust free-play until it is correct.
  2.  
  3. After the free-play is correct, tighten the operating rod locknut D .
  4.  
  5. Turn the brake light switch until it makes contact with the pedal, and then an additional 1 / 2 turn. Tighten the locknut, then attach the electrical connector to the switch.
  6.  

1979-89 RX-7

See Figure 5

Measure the pedal height (distance from the center of the brake pedal's upper surface to the firewall, behind the insulation). It should be 7.48-7.68 in. (190-195mm) for 1979-85 models, or 8.07-8.27 in. (205-210mm) for 1986-89 models. If the distance is not as specified, perform the following adjustments (see illustration):

  1. Detach the connector from brake light switch A .
  2.  
  3. Loosen locknut B and turn switch A until it does not contact the pedal.
  4.  
  5. Loosen locknut D and turn operating rod C to adjust the pedal height as specified.
  6.  
  7. Depress the brake pedal several times by hand and check the free-play. There should be 0.28-0.35 in. (7.0-9.0mm) for 1979-85 models, or 0.16-0.28 in. (4.0-7.0mm) of play for 1986-89 models. Loosen the operating rod locknut and turn the rod to adjust the pedal play until it is correct.
  8.  
  9. After the free-play is within specifications, tighten operating rod locknut D .
  10.  
  11. Turn the brake light switch until it makes contact with the pedal, then tighten the locknut. Attach the electrical connector to the switch.
  12.  

 
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