Rear Brakes - Shudder/Vibration
BRAKE - REAR - SHUDDER AND/OR Article No.
VIBRATION - WITH 7.5 INCH RING GEAR AXLE 87-5-9
FORD 1985-86 MUSTANG, LTD, THUNDERBIRD
LINCOLN-MERCURY 1985-86 CAPRI, MARQUIS, COUGAR, MARK VII, CONTINENTAL
ISSUE: Rear brake shudder and/or vibration may be caused by excessive axle shaft brake drum/rotor pilot runout and/or axle shaft flange face runout. This may be experienced during moderate braking action.
ACTION: To correct this, first check for the condition by lightly applying the parking brake on the vehicle at a slow vehicle speed (10-20 mph/16-32 km/h). If the condition is present, refer to the Car Shop Manual, Section 12 for brake system diagnosis. If after completion of the brake diagnosis checks, the condition is still present, check/replace the axle shaft(s) using the following service procedure.
1. Remove the rear wheel and tire assemblies.
2. Remove the push-on brake drum nuts and discard.
NOTE: Push-on brake drum nuts are used for shipping purposes only and do not require replacement.
3. Remove brake drums/rotors.
NOTE: If vehicle is equipped with rear disc brakes, see Section 12-25 of the appropriate model year Car Shop Manual for rotor removal.
Figure 5:
4. Mount a dial indicator, Rotunda tool - 4201-C, as shown in Figure 5.
5. With drum or rotor removed, check drum/rotor pilot radial runout. If runout exceeds .007 inch, replace axle shaft.
Figure 6:
6. Reposition dial indicator as shown in Figure 6.
7. Check axle shaft flange face lateral runout. If runout exceeds .010 inch, replace axle shaft.
NOTE: Refer to the axle shaft application chart below for correct service part application.
Vehicle Build Date Service Part
LTD/Marquis All D9BZ-4234-C
Mustang/Capri All D9BZ-4234-C
Thunderbird/Cougar Before E3SZ-4234-A
02/01/85
Thunderbird/Cougar After E5SZ-4234-A
02/01/85
Continental/Mark VII All E5LY-4234-A
(with Anti-lock System)
Continental/Mark VII All E25Y-4234-A
(without Anti-lock System)
PART NUMBER PART NAME CLASS
D9BZ-4234-C Axle Shaft A
E3SZ-4234-A Axle Shaft A
E5SZ-4234-A Axle Shaft A
E5LY-4234-A Axle Shaft B
E25Y-4234-A Axle Shaft B
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual
OPERATION: SP870509A - Check runout on both axles
TIME: 0.6 Hr.
OPERATION: SP870509B - Check runout and replace one axle shaft
TIME: 0.8 Hr.
OPERATION: SP870509C - Check runout and replace both axle shafts
TIME: 1.1 Hrs.
OPERATION: SP870509S1 - Extra time to back-off and readjust brakes
TIME: 0.1 Hr.
OPERATION: SP870509S2 - Extra time if equipped with locking lug nuts
TIME: 0.1 Hr.
OPERATION: SP870509S3 - Extra time if equipped with locking wheel covers
TIME: 0.1 Hr. DLR. CODING: Basic Part No. 4234 - Code: 67