1999 Jeep Wrangler Brake Service (ONLINE REPAIR MANUALS)

Removal

Front

• Remove and discard ^2/3 of brake fluid from largest master cylinder reservoir.
• Raise and support vehicle, then remove front wheel.
• Press caliper piston to bottom of bore using suitable screwdriver or c-clamp.
• Disconnect brake hose at caliper and cap hose.
• On 1997-98 models, remove caliper mounting pins.
• On 1999 models, remove caliper spring support by prying spring out of caliper.
• On all models, remove caliper slide pin bushing caps and slide pins.
• Lift caliper up and out of anchor plate and off rotor.

Rear

• Raise and support vehicle, then remove wheel and caliper mounting bolt...

Prior to removing brake shoes it is recommended that a suitable clip or restraining device be applied to the wheel cylinders to prevent the wheel cylinder pistons from being pushed out of their bores.

Brake Shoe Removal

• Raise and support vehicle.
• Remove wheel and tire assemblies, then the brake drums.
• Remove U-clip and washer from parking brake lever pivot pin, Figs. and , then discard clip.
• Using suitable tool, remove primary and secondary return springs.
• Remove spring retainers, hold-down springs, and retaining pins.
• Install suitable clamps over ends of wheel cylinders.
• Remove adjuste...

Service Brakes

• Raise and support vehicle.
• Remove access slot cover at rear of brake support plate.
• Using a suitable brake adjustment tool, rotate adjuster star wheel while turning wheel and tire until brake locks.
• Insert a suitable thin tool through adjustment hole and disengage automatic adjuster arm from star wheel, then back off screw approximately one turn.
• Install access slot cover, then lower vehicle and check for proper brake operation.
• Drive vehicle in Reverse, make 10-15 firm brake applications with one forward stop between each reverse application to equalize adjustment.

Parking ...

The only serviceable power brake booster components are the vacuum hose and the check valve. The power brake booster must be serviced as an assembly. If diagnosis indicates a power brake booster fault condition, the unit must be replaced as an assembly.

Replacement

Full Size Pickup

Vacuum Booster

• With engine stopped, pump brake pedal four or five times to deplete power booster vacuum.
• On 1997 models, proceed as follows:
• Disconnect harness wires from differential switch on combination valve and from RWAL valve.
• Disconnect brake line from combination valve to front brakes, or AB...

Brake System Bleed

• Ensure brake fluid reservoir is full.
• Bleed anti-lock brake system in the following sequence:
• Master cylinder.
• HCU valve body, opening one line at a time.
• Right rear wheel.
• Left rear wheel.
• Right front wheel.
• Left front wheel.
• Attach bleeder hose to bleeder fitting, then immerse hose in a suitable glass container.
• Loosen bleeder screw ^1/2 turn, then depress and hold brake pedal until pedal reaches floor.
• Tighten bleeder fitting only after pedal has bottomed at floor, then release pedal.
• Repeat preceding steps until fluid entering container is free of bubbles. Check brake f...

The Anti-Lock Brake System (ABS) prevents wheel lock-up by monitoring wheel speed and altering pressure to the wheels. This is accomplished using an anti-lock brake module, power brake hydraulic booster, electric pump, accumulator, three channel modulator and wheel speed sensors.

In the event of emergency braking, monitors will read individual wheel speed so that maximum braking effectiveness can be maintained at all times. As wheel speed...