2004 Jeep Wrangler Brake Service (ONLINE REPAIR MANUALS)

Brake System Bleed

ABS system bleeding requires conventional bleeding methods plus use of the scan tool. The procedure involves performing a base brake bleeding, followed by use of the scan tool to cycle and bleed the HCU pump and solenoids. A second base brake bleeding procedure is then required to remove any air remaining in the system.

Manual/Base System

• Remove reservoir filler caps and fill reservoir with proper brake fluid.
• If calipers or wheel cylinders were overhauled, open all caliper and wheel cylinder bleed screws.
• Close each bleed screw as fluid starts to drip from them.
• Fil...

Brake Lines & Linings

Remove one of the front wheels and inspect the brake disc, caliper and linings. The wheel bearings should be inspected at this time and repacked if required.

Do not get any oil or grease on the linings. It is recommended that both front wheel sets be replaced whenever a respective pad is worn or damaged. Inspect and, if required, 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 thickness of ...

Manual

• Remove reservoir filler caps and fill reservoir with proper brake fluid.
• If calipers or wheel cylinders were overhauled, open all caliper and wheel cylinder bleed screws.
• Close each bleed screw as fluid starts to drip from them.
• Fill master cylinder reservoir once more before proceeding.
• Attach one end of bleed hose to bleed screw and insert opposite end in glass container partially filled with brake fluid, Fig. . Ensure bleed hose is immersed in fluid.
• Open up bleeder, then have an assistant press down brake pedal.
• Once brake pedal is down, close bleeder. Repeat bleeding unt...

These self contained vacuum hydraulic power braking units are of the vacuum suspended type. They use engine intake manifold vacuum or a vacuum pump along with atmospheric pressure for their power, eliminating the need for a vacuum reservoir. A mechanically operated control valve, with integral vacuum power diaphragms, controls the degree of brake application or release depending on amount of foot pressure applied to...

Service Brakes

• Raise and support vehicle.
• Remove access slot cover at rear of brake support plate.
• Rotate adjuster star wheel while turning wheel and tire until brake locks using a suitable brake adjustment tool.
• 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 inspect 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...

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.
• Remove primary and secondary return springs.
• Remove spring retainers, hold-down springs, and retaining pins.
• Install suitable clamps over ends of wheel cylinders to hold pistons in place.
• Remove adju...