1990 Ford Ranger Brake Service (ONLINE REPAIR MANUALS)

BRAKE LININGS

Remove both front wheels and inspect the brake discs, calipers and linings. (Wheel bearings should be inspected at this time and repacked if necessary).

Do not get any oil or grease on the linings. It is recommended that both front wheel sets be replaced whenever a respective shoe and lining is worn or damaged. Inspect and, if necessary, replace rear brake linings also.

If the caliper is cracked or fluid leakage through the casting is evident, it must be replaced as a unit.

BRAKE ROUGHNESS

The most common cause of brake chatter on disc brakes is a variation in thick...

SERVICE BRAKE

The rear brake shoes, Figs. and , adjust automatically when the vehicle is driven forward or reverse and the brakes are applied sharply several times. Manual adjustment is required only when brake shoes are replaced. When adjusting rear brakes, ensure that parking brake is properly adjusted and that equalizer is operating freely.

With Drums Removed

• With drums removed, clean areas where shoes contact backing plate, then apply suitable lubricant to these contact areas, ensuring that lubricant does not contaminate linings.
• Using suitable brake shoe adjusting gauge, ad...

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...

The single and tandem vacuum boosters are self contained vacuum hydraulic power braking units. These are vacuum suspended units that use vacuum and atmospheric pressure for their power.

On gasoline engine vehicles, vacuum is supplied through a fitting in the intake manifold. On diesel engine vehicles, vacuum is supplied through a vacuum pump.

The three basic elements of the booster are the vacuum power chamber, mechanically actuated booster check valve an...

Make sure booster rubber reaction disc is properly installed as shown in Fig. , if the master cylinder pushrod is removed or accidentally pulled out. A dislodged disc may cause excessive pedal travel and extreme operation sensitivity. The disc is black compared to the silver colored valve plunger that will be exposed after pushrod and front seal are removed. The booster unit is serviced as an assembly and must be replaced if the reaction disc cannot be properly installed and aligned, or if it cannot be located within the unit itself.

• Disconnect battery ground cable.
• Disconn...

REMOVAL

• Raise and support vehicle.
• Remove wheel and tire assembly.
• On vehicles with full-floating axles, remove brake drum as follows:
• Loosen brake shoe adjustment screw.
• Remove rear axle retaining bolts and lock washers, axle shaft, and gasket.
• Remove wheel bearing locknut, lock washer, and adjusting nut.
• Remove hub and drum from axle.
• Remove brake drum to hub retaining screws, bolts, or bolts and nuts, then remove brake drum from hub.
• On vehicles with semi-floating axles, remove brake drum as follows:
• Remove brake drum retaining nuts.
• Remove brake drum. If brake lining is dragging on brake...