GM 19213355
Wheel Cylinder, Rear

When replacing the Wheel Cylinder raise your vehicle then put safety stands under it before removing the tire and wheel. Place the park brake lever pin first then remove then brake drums and shoes from the rear of the vehicle. Break the brake pipe connection from the rear brake cylinder and uninstall rear brake cylinder retaining bolts to remove the whole unit. Fit the new rear brake cylinder into position and attach it to the vehicle before screwing in both retaining bolts tightly to 20 nm (15 ft. Lbs.). Secure the brake pipe to the rear brake cylinder while tightening it to 17 nm torque measurement (13 ft. Lbs.). Reinstall both brake shoes and drums afterward and take out the park brake lever pin. Attach the tire and wheel before running the brake fluid out of the system to set up the park brake control if needed.

To fix the Wheel Cylinder start with these actions: pull out the pushrod from the cylinder bore then remove the bleeder valve the Piston boots and pistons one after the other plus seals and spring. Test the rear brake cylinder hole for internal damage then evaluate the brake cylinder spring for darkening due to overheating. Tap a crocus cloth inside the brake cylinder and replace it when any scoring remains. Rub clean brake fluid inside the rear brake cylinder. Place brake fluid on the rear brake cylinder components before you add the rear brake cylinder spring , seals , pistons , and Piston cylinder boots . Install the rear brake bleeder valve afterward securing it with 13 nm (100 inch lbs.) and placing back the rear brake cylinder pushrod.

Install the spring assembly, seals, pistons, and boots.

Place the wheel cylinder in position, ensuring to follow the Fastener Notice in Service Precautions.

Install the spring assembly, seals, pistons, and boots.