2005 GMC Jimmy Brake Service (ONLINE REPAIR MANUALS)

Removal

Front

• Siphon brake fluid out of master cylinder until fluid level is approximately ^1/3 full, this will prevent fluid overflow when caliper piston is pushed back into its bore.
• Raise and support vehicle, then remove wheels.
• Push piston back into its bore using suitable C-clamp, Fig. .
• Remove brake caliper hose bolt, then two metal gaskets from brake caliper bolt.
• Remove two caliper mounting bolts and lift caliper off of rotor.

Rear

• Siphon brake fluid out of master cylinder until fluid level is approximately ^1/3 full, this will prevent fluid overflow when caliper piston is pushed ...

Delco Master Cylinder

When performing the following procedures, refer to Figs. and , noting that the composite reservoir may vary in design.

Disassemble

• Remove master cylinder from vehicle.
• Remove reservoir cover and diaphragm. Discard old brake fluid in reservoir.
• Inspect cover and diaphragm. Replace if cut, cracked or deformed.
• Remove fluid level switch and proportioning valve assembly, if equipped.
• Depress primary piston and remove lock ring.
• Plug primary fluid outlet (outlet nearest to cowl when master cylinder is installed), then apply compressed air into secondary fluid outlet ...

2WD Models

Except Montana, Silhouette & Venture

Front

• Raise and support vehicle.
• Remove tire and wheel assembly.
• Remove caliper as outlined in .
• Remove grease cap from hub/rotor, Fig. .
• Remove cotter pin, nut and washer.
• Remove hub/rotor from spindle, being careful not to damage spindle threads or outer bearing.
• Reverse procedure to install, noting the following:
• Apply high-temperature wheel bearing grease to inner and outer wheel bearings.
• Torque nut to 12 ft. lbs., while turning wheel assembly forward by hand, back nut off one flat or until hole in spindle aligns with hole in nut. Insert ...

Aztek & Rendezvous

• Remove coolant reservoir, then relieve fuel system pressure as follows:
• Loosen fuel filler cap to discharge tank pressure.
• Connect fuel pressure gauge tool No. J-34730-1A, or equivalent, to fuel pressure connection. Wrap shop towel around connection while connecting fuel pressure gauge in order to avoid fuel spillage.
• Install bleed hose into an approved container and open valve in order to bleed fuel system pressure.
• Drain any fuel remaining in fuel pressure gauge into suitable container.
• Remove cruise control cable from module, then disconnect electrical ...

In order to properly service power brake systems, a thorough understanding of the various power assist systems is required. These systems provide a mechanical assist, acting to increase the force applied to the master cylinder piston by the driver while decreasing the effort required to obtain acceptable stopping performance. Two basic types of power assist mechanisms are used: vacuum assist diaphragm assemblies which use engine vacuum and in some cases vacuum from an external vacuum pump, and hydraulic assist assemblies which use hydraulic pressure developed by an external pump (us...

Manual Bleed

• If vehicle is equipped with power brakes, remove vacuum reserve by applying brakes several times with engine off.
• Fill master cylinder reservoirs with suitable brake fluid. Ensure to always keep master cylinder reservoirs at least half full during entire bleeding procedure.
• If master cylinder is suspected to have air in bore, it must be bled first. To bleed master cylinder, proceed as follows:
• Disconnect forward brake pipe connection at master cylinder.
• Allow brake fluid to fill master cylinder bore until it begins to flow from forward pipe connector port.
• Connect and ...