GM 94843772 Cylinder Asm,Rear Wheel(RH)

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If an overhaul is indicated due to fluid leakage or sticky operation, explore all options before beginning the job. New wheel cylinders are available, making this task quite easy. If rebuilding the wheel cylinder is chosen, ensure a rebuild kit is available beforehand. Always rebuild both wheel cylinders simultaneously. To remove, raise the rear of the vehicle and support it securely on jackstands, blocking the front wheels to prevent rolling. Remove the brake shoe assembly and clean all dirt and foreign material from around the wheel cylinder. Unscrew the brake line fitting, completely loosening it before removing the wheel cylinder mounting bolts. For models with retaining clips, use curved needle-nose pliers to remove the clip or insert two awls into the access slots to bend the tabs away. Detach the wheel cylinder from the brake backing plate and place it on a clean workbench, plugging the brake line to prevent fluid loss and contamination. If the brake shoe linings are contaminated with brake fluid, install new brake shoes. For the overhaul, remove the bleeder screw, cups, pistons, boots, and spring assembly from the wheel cylinder body. Clean the wheel cylinder with brake fluid, denatured alcohol, or brake system cleaner, and use compressed air to remove excess fluid and blow out the passages. Check the cylinder bore for corrosion and score marks; use crocus cloth for light corrosion, but replace the cylinder if defects cannot be easily removed or if the bore is scored. Lubricate the new cups with brake fluid and assemble the wheel cylinder components, ensuring the cup lips face inward. For installation, place the wheel cylinder in position and install the bolts or the retaining clip, connect the brake line, and tighten the fitting before installing the brake shoe assembly. Finally, bleed the brakes and check brake operation before driving the vehicle in traffic.