F 350 4WD Pickup V8-351 5.8L VIN H EFI (1997)
a.
Make a series of 10 stops from speeds of 48 km/h (30 mph). Make the stops with no more than 30 second intervals between stops. This
generally will induce a maximum pull if there is a drift/pull condition.
b.
Raise the front end of the vehicle so that both tires are off the ground.
c.
Rotate the front tires by hand.
d.
Both tires should rotate with about the same effort with little brake drag occurring. Some brake drag will naturally be present.
3.
If the vehicle has excessive brake drag, proceed as follows:
a.
Open the bleed screw on the affected wheel to check for residual pressure in the brake lines. If there is a squirt of brake fluid out of the
bleeder screw and the drag is reduced or eliminated, the master cylinder may not be allowing the brake fluid to return to the reservoir.
b.
Check the master cylinder push rod adjustment. Refer to the appropriate Service Manual, Section 06-06 for details.
c.
Check the brake pedal to determine is it is returning fully.
NOTE:
FOR ALL 4-WHEEL-DRIVE VEHICLES, MAKE SURE THE HUBS ARE DISENGAGED.
4.
Remove both calipers and check piston retraction using a C-clamp and a wooden block. The piston should move easily back into the bore under
force of the clamp. Inspect and clean any corrosion buildup under and around the knuckle rail and spring clamp. Lubricate between knuckle rail
and spring clips using Silicone Brake Caliper Grease and Dielectric Compound (D7AZ-19A331-A). Repair calipers as required.
5.
If Steps 1 through 4 have not determined the source of the condition, swap rotors and linings from side-to-side.
6.
Test drive the vehicle with 10 or more stops from 64 km/h (40 mph). If there is no change in the drift/pull, the front brakes are not at fault.
7.
Check the rear brakes.
a.
Check for contaminants such as grease, axle lube, leaking brake fluid, etc.
b.
Check for damaged or broken components such as, frozen parking brake cables, improperly installed parts, etc.
c.
Check the rear wheel cylinders by the following method:
^
Reinstall one of the brake drums
^
Have someone apply the brakes very slowly while watching for movement of one of the brake shoes on the side without the drum
installed
^
Reapply the brakes while holding the shoe that moved first. The other shoe should now move. If no movement is observed, repair or
replace the wheel cylinder
^
Reinstall the drum and repeat the procedure on the opposite side of the vehicle
Technical Service Bulletin # 98-15-8
Date: 980803
Steering - Shimmy Diagnostic/Repair Procedure
Article No.
98-15-8
08/03/98
STEERING - SHIMMY - DIAGNOSTIC PROCEDURE -
4X2 AND 4X4 VEHICLES
LIGHT TRUCK:
1988-97 F SUPER DUTY, F-250 HD, F-35O
This TSB article is being republished in its entirety to include the latest level parts and to include the F-250 HD 4X4.
The F-250 and F-350 listed include 4X4 and 4X2.
