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.