Brakes - Pulsation/Judder

9231mazda01

Bulletin No.: 007/92
Issued: 3/24/92


Category
P


Applicable Model/s:
1988-1991 929


Subject:
BRAKE PULSATION/JUDDER


DESCRIPTION


When applying the brakes on some 1988-'91 929 models, pulsation/judder may be felt through the brake pedal. This is caused when the brake pad is applied to an uneven rotor surface. A new material brake pad which reduces rotor surface wear has been used in production of 1992 929 models.

REPAIR PROCEDURE


1988-'91 models within the VIN range below that experience brake pulsation/judder should be inspected for uneven rotor surtace or excessive rotor runout.


If you find that the surface is uneven and no other problems exist, determine whether the surface can be machined to bring the rotor back to within specification, if not replace the rotor.


NOTE:
Rotors should only be replaced if cracks are present or if, after machining the surface, the remaining rotor thickness is below the specified limit.

Minimum allowable rotor thickness:
1988 - 1989 929 20 mm (0.79 in)

1990 - 1991 929 16 mm (0.63 in)

After machining or replacement, install new material brake pads according to Workshop Manual instruction (Section 11 or P).

APPLICABLE VIN RANGE

JM1HC221 * J0 100001-131010
JM1HC221 * K0 200001-222217
JM1HC222 * L0 301923-319623
JM1HC223 * L0 "
JM1HC224 * L0 "
JM1HC222 * M0 400011-421770
JM1HC223 * M0 "
JM1HC224 * M0 "


PARTS INFORMATION


INFORMATION

NEW OLD DESCRIPTION QTY

H330 33 28Z -- Front Brake Pad Set 1


WARRANTY INFORMATION

(Applies only to vehicles covered under warranty)

Warranty Type Code: A
Customer Comment Code: 83
Damage Code: 9E
Part No. of Main Cause: H330 33 28Z
Quantity: 1

Pad Set R&R Both Sides
Operation No.: P0104BRX

Labor Hours: 0.5 Hr.

Rotor Machining (Includes Pad Replacement)
Operation No: P0102BMX
Labor Hours: 1.6 Hrs. Maximum