GM 19213346 Cylinder Asm,Rear Brake

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If an overhaul is necessary due to fluid leakage or sticking brakes, it is important to consider all options before starting the job. New wheel cylinders are available, which can make the task easier. However, if you choose to rebuild the wheel cylinder, ensure that rebuild kits are readily available. To begin, raise the rear of the vehicle and support it securely on jackstands, while also blocking the front wheels to prevent rolling. Remove the brake shoe assembly and thoroughly clean the area around the wheel cylinder on both sides of the backing plate. Unscrew the brake line fitting using a flare nut wrench, but do not pull the line away from the wheel cylinder. Next, remove the wheel cylinder retainer using two screwdrivers and carefully take out the wheel cylinder from the brake backing plate, placing it on a clean workbench. It is important to immediately plug the brake line to prevent fluid loss and contamination. To overhaul the wheel cylinder, remove the bleeder valve, seals, pistons, boots, and spring assembly from the wheel cylinder body. Clean the wheel cylinder using brake fluid, denatured alcohol, or brake system cleaner, and then use compressed air to dry it and blow out any passages. Check the bore for corrosion and score marks, using crocus cloth to remove light corrosion and stains if possible. If the defects cannot be easily removed or if the bore is scored, the cylinder must be replaced with a new one. Lubricate the new seals with brake fluid and assemble the brake cylinder components, ensuring that the boots are properly seated. For installation, place the wheel cylinder in position and use a wood block between the axle flange and the wheel cylinder body to hold it in place. Install the retainer over the wheel cylinder using a 1-1/8 inch 12-point socket to press it into place. Connect the brake line and install the brake shoe assembly. Finally, bleed the brakes.