Hydraulic System: Service and Repair
Hydraulic Leak Check1. NOTE: Brake fluid is water soluble and it is possible that all evidence of fluid leakage has been washed off if the vehicle has been operated in the rain or snow.
Make sure the brake master cylinder reservoir is lull.
2. Apply the brakes several times and make sure the brake pedal feel is not spongy. If necessary, bleed the system.
3. Hold pressure on the brake pedal for 30 seconds.
4. Verity that the reservoir level is dropping.
5. If the reservoir level is dropping, inspect the brake components, fittings and lines to locate the source of the leak.
Brake Load Sensor Proportioning Valve Adjustment-Four Door Sedan
1. NOTE: Make sure that the fuel tank is at least 3/4 full.
Raise the vehicle on a suitable lift so that the vehicle is at curb height and wheels are on a flat surface.
2. NOTE: Do not change the position of tine upper nut on the valve operating rod.
Loosen the valve adjuster sleeve set screw.
3. Cut a piece of 3/8-inch OD x 1/4-inch lid rubber vacuum hose 16.3 mm (0.65 inch) in length and slice it lengthwise.
4. Install the hose on the valve operating rod
5. NOTE: Make sure that the valve adjuster sleeve is sliding freely and is resting on the lower mounting bracket.
Tighten the valve adjuster sleeve set screw.
6. Lower the vehicle.
Runout Check
Special Tool(s)
CAUTION: The brake disc runout specification must be met to ensure correct brake performance without roughness complaints.
CAUTION: Do not install brake discs that are less than the minimum thickness specified. Do not machine a brake disc below the minimum thickness specification.
NOTE: When installing brake discs, always align the painted match marks on the brake disc with those on the front hub.
NOTE: When installing brake discs, always apply High Temperature Nickel Anti-Seize Lubricant F6AZ-9L494-AA or equivalent meeting Ford specification ESE-M12A4-A to the brake disc-to-front hub mating surfaces.
1. Do not remove the tire and wheel assembly. Tighten the wheel nuts to specification.
2. Raise and support the vehicle.
3. Assemble the special tool, using the spherical tip extension.
4. Locate an opening on the inboard side of the dust shield that will allow the dial indicator tip to be positioned at least 5 mm (0.2 inch) from the outer edge of the brake disc.
5. NOTE: Do not clamp the gauge set to a vehicle component separated from the brake disc by a flexible joint, such as a ball joint or body mount.
Clamp the special tool on the vehicle, making sure the flexible indicator arm and probe tip do not touch the dust shield or tire while rotating.
6. Rotate the wheel for six revolutions, and record the total indicated runout.
7. If the total indicated runout exceeds the maximum specification, remove the brake disc.
8. Clean the brake disc mounting face of dirt, rust and foreign material.
9. Measure and record the total indicated runout of the hub face outside the stud circle.
10. Install a new front hub if the total indicated runout exceeds the maximum specification.
^ Repeat the hub runout measurement.
11. If the brake disc TIR is still out of specification, measure and record the thickness of the brake disc. If thickness is sufficient to machine the brake disc to the runout specification, go to Step12. If the thickness is not sufficient, install a new brake disc and recheck the TIR.
12. NOTE: Brake disc machining must be done with an on-vehicle lathe. Follow the lathe manufacturer's instructions.
Using the special tool, machine the brake disc if final thickness will not be less than the minimum specification. Recheck the brake disc runout.