GM 10399859 Pipe Asm,Brake Propn Valve

You can Select Your Vehicle to check if 10399859 fits your vehicle.

About 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 the above defects are found, the hose should be replaced with a new one. To disconnect a brake hose from the brake line, the metal tube nut should be unscrewed with a flare nut wrench, and the U-clip should be removed from the female fitting at the bracket. The hose can then be removed from the bracket and disconnected from the caliper, discarding the sealing washers. When attaching the new brake hose, new sealing washers should be used and the hose should be securely attached to the caliper or wheel cylinder. To reattach a brake hose to the metal line, the end of the hose should be inserted through the frame bracket, ensuring it is not twisted, and the metal line should be attached by tightening the tube nut fitting securely. The U-clip should be installed at the frame bracket. It is important to check that the suspension or steering components do not make contact with the hose, and this can be done by having an assistant push down on the vehicle and turn the steering wheel lock-to-lock during the inspection. After completing the hose inspection and replacement, the brake system should be bled. When replacing brake lines, it is crucial to use the correct parts and avoid using copper tubing. Steel brake lines can be purchased from a dealer or auto parts store, and prefabricated brake lines with flared tube ends and fittings installed are available. These lines can be bent to the proper shapes using a tubing bender. During installation, it is important to ensure that the new line is well-supported in the brackets and has sufficient clearance from moving or hot components. After installation, the master cylinder fluid level should be checked and fluid should be added as necessary. The brake system should be bled and the brakes should be carefully tested before the vehicle is placed into normal operation.