GMC 23135228 Pipe Assembly, Power Brake Booster Vacuum

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Every six months, it is important to inspect the flexible hoses that connect the steel brake lines with the front and rear brake assemblies for any cracks, chafing, leaks, blisters, or other damage. This inspection should be done with the vehicle raised and securely placed on jackstands, using a light and mirror for a thorough check. If any of these defects are found, the hose should be replaced with a new one. To replace the flexible hose, start by cleaning any dirt from the ends of the hose and disconnecting the brake line from the hose fitting. Care should be taken not to bend the frame bracket or line, and penetrating oil can be used if necessary. Next, remove the U-clip from the female fitting at the bracket and remove the hose from the bracket. Remove any mounting fasteners for brackets that secure the hose to other components. If the hose is connected directly to the caliper, disconnect the hose fitting from the caliper by removing the banjo bolt and discard the copper washers on both sides of the fitting. Use new copper washers and attach the new brake hose to the caliper. Route the hose exactly as the original one was and mount any hose brackets that secure the hose to other components. Pass the female fitting through the frame or frame bracket and install the fitting into position with the least amount of twist in the hose. Install the U-clip in the female fitting at the frame bracket and attach the brake line to the hose fitting using a back-up wrench on the fitting. Tighten the lube nut securely. Confirm that the replacement hose follows the same path as the original one to avoid contact with moving suspension or steering components. Finally, bleed the brake lines. When replacing metal brake lines, it is important to use the correct parts and not to use copper tubing. Prefabricated brake lines with flared ends and fittings installed can be used, and if necessary, the line can be carefully bent to the proper shape using a tube bender. During installation, ensure that the new line is well supported in the brackets and has plenty of clearance between moving or hot components. After installation, check the brake fluid reservoir level, add fluid if necessary, bleed the brake system, and confirm that the brakes are fully operational before resuming normal driving.