Cadillac 19213347 Cylinder Asm,Rear Brake

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If an overhaul is needed due to fluid leakage or sticky operation, it is important to explore all options before starting the job. New wheel cylinders are available, making the task easier. However, if it is decided to rebuild the wheel cylinder, ensure a rebuild kit is available beforehand. It is crucial to never overhaul only one wheel cylinder; both should be rebuilt simultaneously. To remove the wheel cylinder, first remove the brake shoes. Then, unscrew the brake line fitting from the rear of the cylinder, being careful not to pull the metal line out. Remove the two bolts securing the cylinder to the brake backing plate and then remove the cylinder. Plug the end of the brake line to prevent fluid loss and dirt entry. To overhaul the cylinder, start by removing the rubber boot from each end and pushing out the pistons, cups, and spring expander. Discard the rubber parts and use new ones from the rebuild kit when reassembling. Inspect the pistons for scoring and scuff marks, replacing them if necessary. Check the cylinder bore for score marks and corrosion, honing slightly if needed or replacing if recommended. Clean the cylinder with brake system cleaner or denatured alcohol. Remove the bleeder screw and ensure the hole is clean. Lubricate the cylinder bore with clean brake fluid and insert a new rubber cup, making sure the lip faces in. Place the expander spring in the opposite end and push it in until it contacts the rear of the rubber cup. Install the remaining cup and attach the rubber boots to the pistons before installing them. The wheel cylinder is now ready for installation. To install, attach the brake line before installing the mounting bolts and tighten the line fitting after the bolts have been tightened. Bleed the brakes and thoroughly test their operation before driving the vehicle in traffic.

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