Topaz L4-140 2.3L CFI (1985)
Brake Rotor/Disc: All Technical Service Bulletins
Brakes - Rotor Service Update
Article No. 85-9-8 Supercedes 85-4-12
BRAKE ROTOR SERVICE - UPDATED DIAGNOSIS AND SERVICE CHART
FORD 1983-85 ALL
LINCOLN-MERCURY 1983-85 ALL
NOTE:
Reprint of 85-4-12 to change title and correct copy.
Technical Service Bulletin Number 82-21-5 refers to sanding the corrosion from the braking surface of the rotor for a brake roughness condition.
Sanding is not effective for removing rust/corrosion or the
black discoloration caused by semi-metallic brake linings on rotors. Rust/corrosion on the rotor surfaces does not affect performance unless it is thick
enough to cause pulsation. The procedure in Condition 5, Step 1, should be revised to read as follows below. TSB 82-21-5 is being republished for your
convenience.
Continuing improvements by brake rotor suppliers in the overall quality level of manufacture and control of critical dimensions has made this change in
procedure possible.
Essentially, brake rotor service consists of sanding the braking surface or replacing the rotor when sanding is not effective.
Following is an updated Brake Diagnostic and Service Chart. It lists most of the conditions a customer will mention when brake service is required, plus
the probable causes and the recommended service.
CONDITION
POSSIBLE CAUSE
SERVICE
1. Squeal - A loud, sharp, high-
1. Brake lining and/or rotor surface
1. Remove caliper assembly from
pitched moderately prolonged
contamination evidenced by glazed
spindle and remove inner and outer
sound that occurs while braking.
surfaces.
linings. Rotor removal from rear
Occasional or intermittent brake
drive vehicles is not necessary.
squeal may result from
Hand sand glaze from linings and
environmental conditions such as
both braking surfaces or rotor. Use
cold, heat, wetness, snow, salt,
Garnet Paper 100A (medium grit) or
mud, etc. This condition is
aluminum oxide 150J (medium).
not a functional one and will
not affect braking effectiveness.
2. Disc brakes - Missing or damaged
2. When the linings are not worn,
brake pad insulators.
replace the brake pad insulators.
(See master parts catalog for
insulator availability).
3. On drum brakes - Loose lining
3. Inspect, service or replace.
rivets, weak, damaged or incorrect
shoe retracting springs, loose or
damaged shoe retainer pins, springs
and clips, and grooved backing plate
ledges.
2. Squeal or Squeak - Brakes not
1. Wheel cover attachment.
1. Seat covers with a rubber mallet.
applied.
Service flanges or replace cover.
2. Improper machining of drum,
2. Replace drum.
causing interference with backing
plate or shoe.
3. Bent or warped backing plate
3. Service or replace. or shoe.
4. Loose wheel attaching lug nuts.
4. Tighten to correct torque. Replace
wheel if stud holes are damaged.