1993 Ford Explorer Brake Service (ONLINE REPAIR MANUALS)

Excessive Pedal Travel

• Worn brake lining.
• Shoe and lining knock back after cornering or rough road travel.
• Piston and shoe and lining assembly not properly seated or positioned.
• Air leak or insufficient fluid in system or caliper.
• Loose wheel bearing adjustment.
• Damaged or worn caliper piston seal.
• Improper booster pushrod adjustment.
• Shoe out of flat more than .005 inch.
• Rear brake automatic adjusters inoperative.
• Improperly ground rear brake shoe and lining assemblies.

Brake Roughness or Chatter; Pedal Pumping

• Excessive lateral runout of rotor.
• Rotor excessively out of parallel.

Excessive P...

Accessing Diagnostic Trouble Codes

The ABS electronic control module is capable of performing on-board diagnostics using Rotunda SUPER STAR II Tester scan tool No. 007-00041A or NGS Tester scan tool No. 007-00500, or equivalent.

On Bronco models, if suitable electronic tester is not available, warning lamp diagnostic trouble codes may be accessed in the following manner:

• Locate test connector, labeled "ANTI-LOCK TEST," in engine compartment. With ignition switch in Off position, connect a jumper wire between pins E and B.
• Turn ignition switch to Run position.
• Remove jumper wire aft...

Operation

The rear anti-lock brake system (RABS II) monitors rear wheel speed through a rear axle mounted sensor. If a lockup condition begins to develop, the RABS II module will control hydraulic pressure to the rear brakes, inhibiting wheel lockup.

Component Locations

Refer to Figs. through for RABS II component locations.

System Self-Test

The RABS II module performs system tests during vehicle start-up and normal operation. The RABS II valve assembly, sensor and fluid level circuits are monit...

Accessing Diagnostic Trouble Codes

• Ensure ignition switch is in Run position with engine off.
• Locate black RABS II diagnostic connector. Disconnect two halves of connector (one side has an orange/black wire attached to it).
• Attach a jumper wire to the orange/black wire side of the connector. Momentarily ground the opposite end of jumper for 1-2 seconds.
• The "REAR ABS" lamp should start flashing a diagnostic trouble code.

Diagnostic Trouble Code Interpretation

• Diagnostic trouble codes consist of a number of short flashes and ends with one long flash. Count short and long flashes to o...

Removal

• Raise and support vehicle, then remove wheel and tire assembly.
• Remove brake drum. If brake drum will not come off, remove rubber plug from adjuster hole and insert a screwdriver and brake adjustment tool No. D81L-1103-C, or equivalent, to disengage brake shoe adjusting lever and loosen brake adjuster screw .
• Inspect wheel cylinders for signs of leakage. If evidence of leakage is present, service cylinders as necessary.
• Install brake cylinder clamp tool No. D 81L-1103-B, or equivalent, over ends of wheel cylinder, then contract brake shoes as follows:
• Disengage adjusting lever ...

Normal Hydro-Boost units will produce certain noises that current technology cannot correct. These noises occur when brake pedal is manipulated in a manner not associated with everyday braking habits. Normal operating noise can be a hissing, clunk, click or a chatter.

If above normal pedal efforts are applied, the Hydro-Boost unit will emit hissing noises. These noises will be particularly noticeable with the vehicle motionless and will increase in intensity as pedal efforts increase and system operating temperatures increase. Loud hissing noises at or below normal pedal effo...