F 150 2WD Pickup V8-351 5.8L Lightning (1993)
Wheels: All Technical Service Bulletins
Brakes - Shudder/Vibration During Light to Moderate Stop
Article No.
93-12-14
06/09/93
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BRAKES - SHUDDER/VIBRATION DURING LIGHT TO MODERATE STOPS - SINGLE REAR WHEEL VEHICLES BUILT FROM 3/1/92
TO 2/18/93
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VIBRATION OR SHUDDER DURING LIGHT TO MODERATE STOPS - SINGLE REAR WHEEL VEHICLES BUILT FROM 3/1/92 TO
2/18/93
LIGHT TRUCK:
1992-93 E-250, E-350, F-250, F-350
ISSUE:
A vibration or shudder may occur during light to moderate brake stops and snub (slight) brake applications between 20-55 mph (32-88 km/h). This may
be caused by excessive wheel mounting pad height variability on 16x7 steel wheels which can contribute to brake drum distortion.
ACTION:
Replace all five (5) wheels with new wheels which have more consistent wheel mounting pad heights which do not distort the brake drums. Refer to the
following procedure for service details.
1.
Determine if the vibration/shudder is induced by the rear brakes, by making a light stop from about 35 to 50 mph (56 to 80 km/h) using the parking
brake. To use the parking brake, proceed as follows:
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F-Series: Hold the release handle out while depressing the parking brake pedal with the left foot.
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Econoline: Depress the parking brake slightly and release causing the parking brake to set very lightly. Immediately, reapply the foot pressure
on the parking brake pedal to activate the auto-release mechanism of the brake. The parking brake will then be capable of being modulated
with light foot pressure to determine if the shudder is caused by the rear brakes.
