Brakes - Soft Pedal Feel/Pull/Irregular Wear
Article No.98-5A-29
03/18/98
^ BRAKES - "SOFT" PEDAL FEEL
^ BRAKES - IRREGULAR BRAKE WEAR AND/OR
BRAKE PULL - SERVICE TIPS
LIGHT TRUCK:
1980-91 E-250, E-350
1980-94 F-250, F-350
ISSUE:
Some vehicles may exhibit any one or more of the following conditions:
^ Excessive brake pedal travel
^ Irregular front lining wear
^ Brake pull
This may be caused by the inner brake pad binding and/or the outer pad being installed out of position.
ACTION:
Refer to the following Service Tips when servicing a vehicle for any of the concerns listed above.
SERVICE TIPS
1. Before servicing brakes, inspect the caliper for correctly positioned pads and equal lining wear. Refer to Figure 1.
2. An incorrectly positioned outer pad could become bent after the first brake application. Refer to Figure 2.
3. Remove the pads. Hold the inner pad and outer pad against each other as shown in Figure 3. Check to see if the wear surfaces are parallel to the pad back surfaces. If the pads have an angled wear, this may indicate that a pad was mispositioned and/or was not sliding properly on the caliper rail.
NOTE:
PADS WITH AN ANGLED WEAR PATTERN REQUIRE EXCESSIVE CALIPER MOVEMENT TO SEAT THE PADS TO THE ROTOR. THIS EXTRA MOVEMENT REQUIRES EXTRA FLUID VOLUME, RESULTING IN ADDITIONAL PEDAL TRAVEL, SIMILAR TO MISADJUSTED REAR BRAKES.
4. Inspect the inner pad for binding. Inner pads could become stuck to the slide surface due to contamination, burrs, or corrosion. Refer to Figure 4.
NOTE:
REFER TO TSB 98-5A-13 FOR FURTHER INFORMATION ON THE USE OF SILICONE BRAKE CALIPER GREASE AND DIELECTRIC COMPOUND.
5. Reinstall the caliper. During reassembly, inspect the pads and clean the caliper slide surfaces of corrosion, contamination, or burrs. Polish with a crocus cloth and lubricate with Silicone Brake Caliper Grease and Dielectric Compound (D7AZ-19A331-A). Refer to Figure 5.
NOTE:
ON 1988-91 F-250/350 TRUCKS THAT WERE INVOLVED IN RECALL 92S44, BE SURE TO REASSEMBLE USING ALL COMPONENTS OF THE BRAKE CALIPER PISTON INSULATOR KIT UNLESS PHENOLIC PISTONS HAVE BEEN INSTALLED.
6. Reinstall the pads. During pad installation, be careful not to dislodge the outer pad from its slide position. Refer to Figure 6. An incorrect installation will cause a bent outer pad. Refer to Figure 2.
7. Once the calipers have been reinstalled and servicing is complete, but before installing the wheels, apply the brakes and confirm the outer pad position remains correct.
PART NUMBER PART NAME
D7AZ-19A331-A Silicone Caliper Grease And
Compound
OTHER APPLICABLE ARTICLES: 98-5A-13
SUPERSEDES: 97-15-17
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 301000