F 250 2WD Pickup V8-7.3L DSL Turbo VIN F (1994)
Brake Rotor/Disc: Service and Repair
Brake Rotor/Disc
Installation
Wheel bearing lubricant is a lithium-base grease. Sodium-base grease is not compatible with lithium-base grease and should not be intermixed.
Therefore, do not lubricate front and/or rear wheel bearings without first identifying the type of original wheel bearing lubricant. Usage of incompatible
bearing lubricants may result in premature lubricant breakdown.
1. If a new hub and rotor will be installed, remove the protective coating, any dirt or grease deposits with brake parts cleaner or degreaser.
2. Pack the inside of the hub with lithium-base grease or equivalent. Fill the hub until the grease is flush with the inside diameters of both bearing
cups. Pack the bearing cones and rollers with wheel bearing grease. Use a bearing packer for this operation. If a packer is not available, work as
much lubricant as possible between the rollers and cages. Lubricate the cone surfaces with grease.
Installing Grease Seal (Typical)
3. Place the inner bearing cone and roller in the inner cup and install the new grease seal. Be sure that the seal is fully seated.
4. Install the hub and rotor on the wheel spindle. Keep the hub centered on the spindle to prevent damage to the grease retainer or the spindle threads.
5. Install the outer bearing cone and roller and the flat washer on the spindle, then install the adjusting nut, and adjust the wheel bearing.
6. Install the retainer, new cotter pin, and grease cap.
7. Install the caliper.
Refinishing
Each time the brakes are serviced, the disc brake rotor should be checked for scoring, runout, parallelism and thickness.
ROTOR MACHINING
Do not machine, cut or true up new front disc brake hub and rotors prior to installation on vehicle. Making a light cut on a new front disc brake
hub and rotor may cause excessive runout and result in brake shudder several thousand miles later. It is best to clean oil film off new front disc
brake hub and rotor with Brake Cleaner or equivalent install it on vehicle.
Never use a brake lathe that cuts only one face of the front disc brake hub and rotor at a time. It must be a simultaneous straddle cut. All front disc
brake hub and rotor refinishing must adhere to the rule that equal amounts of front disc brake hub and rotor stock are removed from each braking
surface each time a front disc brake hub and rotor is refinished.
On-vehicle brake lathes, machine the front disc brake hub and rotor while it is on the hub and is turning on the same axis as the hub. This
procedure reduces front disc brake hub and rotor lateral runout to near zero by cutting the front disc brake hub and rotor perpendicular to the axis
of the hub, therefore cancelling the affect of stacked tolerance of the front disc brake hub and rotor and front wheel spindle. Follow the on-vehicle
brake lathe manufacturer's instructions on machining procedures.
A bench-mounted disc brake lathe machines the disc brake hub and rotor to the axis of the lathe arbor and will not reduce total lateral runout
associated with stacked tolerances of the front disc brake hub and rotor and front wheel spindle. Follow manufacturer's instructions on machining
procedures.
