Brakes - Rear Brake Thumping/Knocking Noise
TSB 10-15-308/16/10
THUMPING/KNOCKING NOISE - REAR BRAKES
FORD:
2010 Transit Connect
This article supersedes TSB 09-19-14 to update the Service Procedure.
ISSUE
Some 2010 Transit Connect vehicles may exhibit a thumping or knocking noise coming from the rear when braking. The cause of the noise (at low mileage) may be the screw effect of the rear drum inner friction sur[ace during initial braking, when rear shoes first touch the drum. When new rear shoes initially touch a new drum inner surface, on some vehicles, there is tendency for the shoes to follow the turning marks (directional grooves in the sur[ace finish), move laterally and hit the backing plate in each wheel rotation. This can cause a repeating knock-knock noise. This noise will continue until bedding occurs between the rear shoes and drum (swapping the drums changes the direction of the grooves). After bedding occurs, the turning marks on the drum surface disappear.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
1. Apply the parking brake 3 notches.
2. Drive the vehicle at a maximum of 15 mph (24 Km/h) in first gear for 820 feet (250 meters).
3. Drive vehicle for 820 feet (250 meters) in reverse.
4. Release parking brake and wait a minimum of 15 minutes.
5. Road test vehicle to verify noise concern is corrected. Is the concern still present?
a. a. Yes - Go to Step 6.
b. b. No - Repair complete. No further action is required.
6. Remove the brake drums per Workshop Manual (WSM), Section 206-02.
7. Clean the inner sur[aces of drums.
8. Install each brake drum on the opposite side of the vehicle.
9. Adjust the parking brake cable per WSM, Section 206-05.
10. Road test vehicle to verify concern has been corrected. Is the concern still present?
a. Yes - Machine the drums lightly to remove the groove marks. Refer to WSM, Section 206-02.
b. No - Repair complete. No further action is required.
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
OPERATION DESCRIPTION TIME
101503A 2010 Transit Connect: 0.3 Hr.
Includes Time To Road
Test and Diagnose. (Do
Not Use With Any Other
Labor Operations)
101503B 2010 Transit Connect: 1.2 Hrs.
Includes Time To Road
Tests and Diagnose,
Remove Both Rear Brake
Drums And Swap The Left
Side Brake Drum With The
Right Side Brake Drum.
(Do Not Use With Any
Other Labor Operations)
101503C 2010 Transit Connect: 1.8 Hrs.
Includes Time To Road
Tests and Diagnose,
Remove Both Rear Brake
Drums And Swap The Left
Side Brake Drum With The
Right Side Brake Drum,
Concern Still Present.
Machine Both Rear Brake
Drums. (Do Not Use With
Any Other Labor
Operations)
DEALER CODING
CONDITION
BASIC PART NO. CODE
1126 07
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