GM 19213355 Cylinder Asm,Rear Brake

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To remove and install the wheel cylinder on 1990 vehicles with anti-lock brakes, first depressurize the hydraulic accumulator, then raise and safely support the vehicle. Remove the wheel and tire assembly along with the brake drum, and clean the area around the wheel cylinder inlet, pilot, and bleeder valve. Next, remove the brake shoes and the bleeder valve, disconnect the brake line from the wheel cylinder while plugging the opening to prevent fluid loss, and take out the wheel cylinder mounting bolts and the wheel cylinder itself. Clean the old sealant from the backing plate and the wheel cylinder if it is to be reinstalled. For installation, apply Loctite Master Gasket or an equivalent to the wheel cylinder shoulder face that contacts the backing plate, position the wheel cylinder, and install the mounting bolts, tightening them to 106 inch lbs. (12 Nm). Connect the brake line to the wheel cylinder and tighten the fitting to 11 ft. lbs. (15 Nm), then install the bleeder valve and tighten it to 88 inch lbs. (10 Nm). Install the brake shoes, adjust them, and put the brake drum back on. Bleed the brake system, install the wheel and tire assembly, lower the vehicle, and check the parking brake adjustment. For overhaul, while wheel cylinder overhaul kits may be available, it is often more sensible to substitute a new or reconditioned part. If opting for an overhaul, ensure no contaminants enter the system by using clean, new, high-quality brake fluid. If dirty fluid has been used, drain and flush the system, replace all rubber components, refill, and bleed the system. Remove the wheel cylinder from the vehicle and place it on a clean workbench, then discard the old rubber boots and withdraw the pistons, which are equipped with seals and a spring assembly. Remove the remaining inner components, seals, and spring assembly, using compressed air if available, and discard all components for which replacements are supplied in the rebuild kit. Wash the cylinder and metal parts in denatured alcohol or clean brake fluid, allow them to air dry or use compressed air, and avoid using rags. Inspect the piston and replace it if scratched, lubricate the cylinder bore and seals with clean brake fluid, position the spring assembly, install the inner seals and pistons, insert the new boots into the counter bores by hand without lubrication, and finally install the wheel cylinder.

To remove the brake drum and brake shoes, start by unscrewing the brake line fitting from the rear of the wheel cylinder using a flare-nut wrench to avoid rounding off the corners. Be careful not to pull the metal line out of the wheel cylinder. Next, remove the two bolts securing the wheel cylinder to the brake backing plate and then remove the wheel cylinder. To prevent the loss of brake fluid and the entry of dirt, plug the end of the brake line. For the overhaul process, disassemble the wheel cylinder by removing the rubber boot from each end, pushing out the pistons and cups, and removing the cup return spring and expander. Replace the rubber parts with new ones from the rebuild kit. Inspect the pistons for scoring and scuff marks and replace them if necessary. Check the cylinder bore for score marks and corrosion, and if present, consider honing or replacing the cylinder. Clean the cylinder with brake system cleaner or denatured alcohol and ensure the bleeder screw hole is clean. Lubricate the cylinder bore with clean brake fluid and insert the new rubber cups, making sure the lip faces in. Install the expander spring and remaining cup, attach the rubber boots to the pistons, and then install the pistons and boots. Finally, for installation, attach the brake line to the wheel cylinder before tightening the mounting bolts and line fitting. Use a flare-nut wrench if available. Bleed the brakes and thoroughly test their operation before driving the vehicle in traffic.

Start by unscrewing the brake line fitting from the rear of the wheel cylinder using a flare-nut wrench. Be careful not to pull the metal line out of the wheel cylinder. Then, remove the two bolts securing the wheel cylinder to the brake backing plate and remove the wheel cylinder.

Ensure a rebuild kit is available beforehand.

Start by raising the rear of the vehicle and supporting it securely on jackstands. Block the front wheels to prevent the vehicle from rolling.

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.

Attach the brake line to the wheel cylinder before tightening the mounting bolts and line fitting. Use a flare-nut wrench if available.

Be careful not to pull the brake line away from the wheel cylinder.

Replace the pistons if necessary. Consider honing or replacing the cylinder if there are score marks or corrosion.