GMC 12541500 Pipe,Brake (Bulk Tubing 5/16" 8Mm)

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Approximately every six months, raise the vehicle and securely support it on jackstands to inspect the flexible hoses connecting the steel brake lines to the front and rear brake assemblies. Look for cracks, chafing, leaks, blisters, or any damage. Thoroughly inspect the hoses using a light and mirror if needed, and replace any hose exhibiting the mentioned conditions. Replacement of Front Brake Hose: Disconnect the brake line from the hose fitting using a back-up wrench, then remove the U-clip from the hose fitting. Remove the hose from the bracket, and at the caliper end, remove the bolt from the fitting block along with the copper gaskets. When installing the new hose, use new copper gaskets and lubricate bolt threads with clean brake fluid before attaching. Attach the hose to the caliper with the fitting flange engaged in the caliper locating ledge, and install the female fitting in the hose bracket without twisting the hose. Reinstall the U-clip retaining the female fitting to the frame bracket and reattach the brake line to the hose fitting using a back-up wrench. Ensure there are no kinks in the hose and check for contact with suspension parts during extreme wheel turns. Rear Brake Hose: Disconnect the hose at both ends using a back-up wrench, remove the U-clips, and separate the female fittings from the brackets. Unbolt the hose retaining clip and remove the hose. Install the female ends in the frame brackets without twisting the hose, then reinstall the U-clips to retain the female end to the bracket. Attach the steel line fittings to the female fittings using a back-up wrench, ensuring the bracket isn't loosened during hose installation. Fill the master cylinder reservoir and bleed the system. Metal Brake Lines: When replacing brake lines, use prefabricated brake lines or obtain the recommended steel tubing and fittings to match the line to be replaced. Cut the new tubing to the correct length, flare the ends with an ISO flaring tool, and carefully bend the line to the proper shape if necessary. Install the new line securely supported in the brackets with sufficient clearance from moving or hot components. After installation, check the master cylinder fluid level, bleed the brake system, and thoroughly test the brakes before driving in traffic.

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 replace the hose, start by cleaning any dirt away from the ends of the hose and disconnecting the brake line from the hose fitting, being careful not to bend the frame bracket or line. If necessary, soak the connections with penetrating oil. Remove the U-clip from the female fitting at the bracket and remove the hose from the bracket. Disconnect the hose from the caliper, discarding the copper washers on either side of the fitting. Attach the new brake hose to the caliper using new copper washers. Pass the female fitting through the frame or frame bracket, installing it with the least amount of twist in the hose. Install the U-clip in the female fitting at the frame bracket. Attach the brake line to the hose fitting using a back-up wrench on the fitting. Carefully check to ensure that the suspension or steering components do not make contact with the hose, and have an assistant push down on the vehicle and turn the steering wheel lock-to-lock during inspection. Afterward, bleed the brake system. When replacing brake lines, always use the correct parts and avoid using copper tubing. Purchase steel brake lines, preferably prefabricated ones with the tube ends already flared and fittings installed. 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 master cylinder fluid level and add fluid as necessary. Finally, bleed the brake system and test the brakes carefully before placing the vehicle into normal operation.

Brake hoses are rubber covered flex hoses designed to transmit brake pressure from the metal tubes running along the frame to the calipers in front and wheel cylinders in the rear.

Bend the pipe to match the old pipe allowing a clearance of at least 0.75 in. (19mm) from all moving parts and vibrations.

Clamp the flaring tool body in a vise carefully, select the correct size collet, then the forming mandrel for the pipe size use, insert the proper forming mandrel into the tool body.

To remove the hose, raise and support the vehicle, remove the through-bolt that fastens the hose to the caliper, remove any clips retaining the connection at the frame, and unscrew the flare fitting located on the pipe running along the frame.

Carefully avoid bending the frame bracket or line, ensure that the suspension or steering components do not make contact with the hose, and have an assistant push down on the vehicle and turn the steering wheel lock-to-lock during inspection.

Every six months, the rubber hoses should be inspected for any cracks, chafing, leaks, blisters, or other damage. This inspection should be thorough, and any hose exhibiting these conditions should be replaced.

By passing the female fitting through the frame or frame bracket and installing it carefully.

The hose should be replaced with a new one.

When replacing metal brake lines:Use the correct steel brake lines and avoid using copper tubing.

Cracks, chafing, leaks, blisters, or any other damage.

Carefully avoid bending the frame bracket or line, ensure that the suspension or steering components do not make contact with the hose, and have an assistant push down on the vehicle and turn the steering wheel lock-to-lock during inspection.