Front Disc Brakes - Knocking Noise When Braking Gently
Article No.98-5A-14
03/18/98
^ BRAKES - FRONT DISC - "KNOCKING" NOISE
WHEN BRAKING GENTLY
^ NOISE - " KNOCKING" SOUND FROM FRONT
BRAKES WHEN BRAKING GENTLY
FORD:
1991-96 ESCORT
LINCOLN-MERCURY:
1991-96 TRACER
ISSUE:
A "knocking" noise proportional to wheel rotation may be heard from the front brakes during gentle braking. If pressure is maintained on the brake pedal when the noise occurs, the noise will continue until the vehicle comes to a complete stop. This noise may be due to wear spots and ridges on the upper main caliper sleeve. This condition does not affect brake performance or stopping distance.
ACTION:
Replace the old caliper sleeve with a revised caliper sleeve. The revised part is made of a harder material which should be more resistant to wear spots and ridge formation. Refer to the following procedure and to the appropriate Escort/Tracer Service Manual, Section 06-03, for service details.
NOTE:
THE "KNOCKING" NOISE REFERENCED IN THIS TSB ARTICLE IS COMPLETELY DIFFERENT FROM THE "SQUEALING" OR "SQUEAKING" NOISE CAUSED BY BRAKE PADS.
SERVICE PROCEDURE
1. Raise and support the vehicle. Refer to the appropriate Escort/Tracer Service Manual, Section 00-02.
2. Remove the two (2) brake caliper bolts and remove the brake caliper from the knuckle/rotor. Secure the brake caliper with technician's wire to prevent damage to the brake hoses.
3. Remove the upper main caliper sleeve and boots, Figure 1. Refer to the appropriate Escort/Tracer Service Manual, Section 06-03, for removal procedure.
NOTE:
IT IS NOT NECESSARY TO REPLACE THE LOWER CALIPER SLEEVES OR ANY OF THE RUBBER DUST BOOTS UNLESS WORN OR DAMAGED.
4. Install new upper main Caliper Sleeves (F4CZ-2B393-B) and reinstall dust boots. Reverse the removal procedure to install.
PART NUMBER PART NAME
F4CZ-2B393-B Caliper Sleeve
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 96-6-1
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage For 1992-96 Models, Basic Warranty Coverage For 1991 Model Year Vehicles
OPERATION DESCRIPTION TIME
985A14A Replace One Main Sleeve 0.4 Hr.
985A14B Replace Both Main 0.5 Hr.
Sleeves
DEALER CODING
CONDITION
BASIC PART NO. CODE
2B393 14
OASIS CODES: 301000, 702100, 703400