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Page Hits: 1965215
US BULLETIN No: P001/91 DATE: 1991
CAN BULLETIN No: N/A
APPLIES TO: 1989-1991 MPV AFFECTED VINs: All
SUBJECT: Brake noise
DETAILS:
If premature wear occurs on the front brake pads, a constant noise will be produced by the wear indicators.

REPAIR PROCEDURE

  1. Replace the front brake pads with the revised pads according to the Parts Information table of this bulletin. Inspect and replace the shims if the rubber coating shows that damage has occurred aside from normal installation. Clean up the rotor(s) surface. If the rotor(s) thickness is less than the minimum required thickness of 22.00 mm (0.87 in), replace the rotors.
  2. After replacing front brake pads, check for any signs of dragging brakes.
  3. With engine running, apply the brakes two (2) or three (3) times (as if you were stopping the vehicle).
  4. Release the brake pedal and rotate brake rotors two (2) full turns.
  5. Using a spring scale, check for brake drag. If brake drag is more than 12 kg (26 lbs), open bleeder and check brake drag again. If rotor drag is okay, go to step 6. If brake drag is still too high, go to step 7. Figure 1.
    NOTE: Brake rotor drag should be less than 12 kg (26 lbs).
    Figure 1: Checking Brake Drag

  6. If brake drag is now less than 12 kg (26 lbs), check clearance at brake pedal-to-power brake booster rod. Clearance should be 4.0-7.0 mm (.16-.28 in). If it is not correct, adjust brake pedal as described in the appropriate Workshop Manual. Figure 2
    Figure 2: Checking Brake Pedal-to-Power Booster Clearance

  7. Using Special Gauging Tool (SST49 F043 001), check clearance at booster-to-master cylinder push rod. If not within specifications, adjust push rod as described in the appropriate Workshop Manual. Figure 3.
    Figure 3: Checking Booster-to-Master Cylinder Push Rod Clearance

    BOOSTER-TO-MASTER CYLINDER CLEARANCE
    1989-'90 0.1-0.3mm
    .004-.012 in
    1991 0.1-0.4mm
    .004-.016 in

     

  8. If brake drag is greater than 12 kg (26 lbs), check caliper and hub for damage or misalignment. Replace parts as required and check brake drag again.

PARTS INFORMATION

Part Number Description Qty. Notes
LAY1 33 28ZD  Pad Set, Front  MPV 4x2 (Old Part No: LAY1 33 28ZC) 
LAY1 33 29ZB  Shim  MPV 4x2 
LAZ2 33 28ZA  Pad Set, Front  MPV 4x4 (Old Part No: LAZ2 33 28Z) 
LAZ2 33 29ZB  Shim  MPV 4x4 
LA01 33 251A  Disc Brake Rotor  MPV 2x4/4x4 

WARRANTY INFORMATION

Note: This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.

Warranty Type A
Symptom Code 94 
Damage Code 9C 
Part Number Main Cause LAY1 33 28ZD or LAZ2 33 28ZA 
Quantity
Operation Number P0104BRX 
Labor Hours 0.5 
CONSUMER NOTICE:
The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by "do-it-yourselfers." Consumers should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies, consumers should contact their nearest authorized Mazda dealership.
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