1991 Ford Bronco Brake Service (ONLINE REPAIR MANUALS)

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 hydra-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...

When working on or around brake assemblies, care must be taken to prevent breathing asbestos dust, as many manufacturers incorporate asbestos fibers in the production of brake linings. During routine service operations precautions should be taken to minimize exposure. Do not sand or grind brake linings unless suitable local exhaust ventilation equipment is used to prevent excessive asbestos exposure.

• Wear a suitable respirator approved...

RAIL SLIDER CALIPER

Removal

• Drain a small amount of brake fluid from master cylinder reservoir.
• Raise and support vehicle, then remove wheel and tire assembly.
• Install an eight inch C-clamp on caliper housing and tighten clamp to bottom piston(s) in cylinder bore(s), then remove clamp. Do not use screwdriver or other edged tool to pry piston(s) from rotor.
• Remove key retaining screw, then using a hammer and drift, drive out caliper support key and spring.
• On single piston calipers, push caliper downward against spindle, then rotate upper end upward and out of spindle assembly.
• On dua...

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...

To check adjustment of pushrod, fabricate a gauge and position it against master cylinder mounting ...

Bleed primary and secondary hydraulic brake systems separately, bleeding the longest line first on each system. Do not allow reservoir to run dry during bleeding operation. Never reuse fluid that has been drained from the hydraulic system.

• Loosen master cylinder to hydraulic line nuts and wrap shop cloths around tubing below fitting to absorb escaping brake fluid.
• Depress brake pedal slowly forcing air trapped in master cylinder out at fitting.
• Hold pedal down and tighten fittings, then release brake pedal. Releasing brake pedal before fittings are tightened will allow air to ...