Marquis L4-140 2.3L VIN A 1-bbl (1986)
Brake Drum: All Technical Service Bulletins
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
