Ford F150 Pickup. Instruction - part 374
Vibration When Brakes Are Applied
For vibration concerns when brakes are applied, carry out the following procedure.
1. Verify the concern.
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Brake vibration concerns are caused by uneven disc wear or lining transfer and should be verified
with a test drive since these conditions are difficult to measure with available shop tools. For
additional information, refer to NOISE, VIBRATION & HARSHNESS - F150 PICKUP .
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Check Technical Service Bulletins for vehicle specific brake concerns.
2. Remove the wheel and tire assembly. For additional information, refer to WHEELS & TIRES - F150
PICKUP .
3. Remove the brake caliper. For additional information, refer to DISC & DRUM .
4. Inspect the brake linings. Install new pads if the thickness of the lining is below the specification or if
cracks in the lining wide enough to see through down to the backing plate are present.
5. Inspect the brake discs.
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Install new discs if cracked.
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Resurface the brake discs if the diagnosis has revealed vibration in the steering wheel, seat, or pedal
while braking. Heavily scored brake discs, similar to that caused by linings worn down to the
backing plate, should also be machined.
6. Measure the disc thickness and record the measurement. For discs that require machining, install a new
disc if the thickness is less than 0.60 mm (0.02 in) above the minimum thickness specification cast in the
disc. This will make sure that the disc will be above minimum thickness after machining. Do not machine
new discs.
7. For vehicles with a two-piece brake disc and hub assembly:
1. Match-mark before disassembly.
2. Remove the brake disc.
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Brake discs
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Wheel bearings
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Brake pads
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Brake shoes and linings
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Brake drum
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Power brake booster
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Brake pedal linkage
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Booster vacuum hose
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Tires
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Foreign material
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Brake master cylinder fluid level switch
CAUTION: Do not use an abrasive sanding disc since it will remove paint
or other protective finishes from wheel and metal from
mounting surfaces, adversely affecting corrosion protection
2003 Ford Pickup F150
2003 GENERAL INFORMATION Brake System - General Information - F150 Pickup