Laser L4-1997cc 2.0L DOHC (1990)
Brake Disc: All Technical Service Bulletins
Brakes - Shudder/Pulse/Squeal Condition
NO.: 05-02-91 Rev. A
GROUP:
BRAKES
DATE:
June 17, 1991
SUBJECT:
BRAKE SHUDDER/ PULSE/NOISE
MODELS:
1990->> 91 << (BD) LASER
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 05-02-91 WHICH SHOULD BE REMOVED FROM YOU FILES. ALL
REVISIONS ARE HIGHLIGHTED WITH >> ARROWS <<.
SYMPTOM/CONDITION:
Some 1990 and >> 1991 << Laser vehicles may experience a shudder/pulse/squeal from the front brakes or squeal from the rear brakes. The following
parts are now available to help reduce these complaints.
DIAGNOSIS:
Determine if noise is coming from the front or rear brakes. If the noise is coming from the rear brakes, replace the rear brake pads as outlined in
appropriate service manual. If shudder/pulse/noise is coming from the front brakes, continue with this repair procedure.
PARTS REQUIRED:
DESCRIPTION
APPLICATION
PART NUMBER
FRONT BRAKES
Pad and Shim Kit
1990 VIN prior to
>> MB895168 <<
(replaces pad kit
LE022700
MB587284 & MB668398)
Pad and Shim Kit
1990 VIN after
>> MB895072 <<
(replaces pad kit
LE022701
MB699174 & MB858583)
>> ALL 1991 <<
REAR BRAKES
Pad Kit
2WD Vehicles
MB857732
Pad Kit
4WD Vehicles
MB857729
>> REPAIR PROCEDURE: <<
NOTE:
FAILURE TO FOLLOW REPAIR PROCEDURES WILL CAUSE BRAKE SHUDDER/PULSE TO REOCCUR.
This repair involves checking the front disc rotors for thickness variation, runout, phasing the rotor to the hub, and or replacement of brake pads.
On vehicle, disc rotor runout is the combination of the individual runout of the hub face and the runout of the disc.
1.
Remove the front wheel and reinstall the disc to the hub. Install the lug nuts and tighten to 120-140 N-m (87-101 ft.lbs.).
FRONT DISC BRAKES
CHECKING DISC ROTOR FOR RUNOUT AND THICKNESS VARIATION AND OR PHASING DISC ROTOR TO HUB:
1.
Thickness variation measurements of disc should be made in conjunction with runout.
2.
Mount a dial indicator on the steering arm. Dial indicator plunger should contact disc (braking surface) approximately 5 mm (0.2 in.) from