GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Brake Hoses and Pipes

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REMOVAL & INSTALLATION



Brake Hose
  1. Raise the end of the vehicle with the hose to be replaced. Secure the vehicle properly with jackstands.
  2.  
  3. If necessary, remove the wheel.
  4.  
  5. Note the hose routing for ease of installation later.
  6.  
  7. Remove any attaching brackets and loosen the fittings using a flare nut wrench only.
  8.  
  9. Remove the hose any plug any open lines.
  10.  

To install:
  1. Install the brake hose and any brackets which were removed.
  2.  
  3. Torque all fittings to 10-15 ft. lbs (14-20 Nm).
  4.  
  5. Properly bleed the system.
  6.  
  7. Remove the jackstands and lower the vehicle.
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Brake Pipe
  1. Raise the end of the vehicle with the line to be replaced. Secure the vehicle properly with jackstands.
  2.  
  3. If necessary, remove any components which will interfere with removal.
  4.  
  5. Note the line routing for ease of installation later.
  6.  
  7. Loosen the fittings using a flare nut wrench only. Plug the open line.
  8.  
  9. Trace the line from one end to the other and loosen the fitting using a flare nut wrench only. Plug any open lines.
  10.  
  11. Remove any retaining clips and remove the line from the vehicle.
  12.  

To install:
  1. Obtain a replacement line. If it is longer than the original, one end must be cut and flared.
  2.  
  3. If necessary, bend tubing using an approved tubing bender only.
  4.  

When bending, don't kink or crack the line. If it does kink or crack, the line must be replaced.

  1. Flush the line before installing.
  2.  
  3. Install the line and torque to 10-15 ft. lbs (14-20 Nm).
  4.  
  5. Bleed the system properly. Install any components removed earlier.
  6.  

BRAKE PIPE FLARING



Flaring steel lines is a skill which needs to be practiced before it should be done on a line to be used on a vehicle. A special flaring kit with double flaring adapters is required. It is essential that the flare be done uniformly to prevent any leaks when the brake system is under pressure. Only steel lines, not copper lines, should be used. It is also mandatory that the flare be a double flare. With the supply of parts available today, a pre-flared steel brake line should be available to fit your needs. Due to the high pressures in the brake system and the serious injuries that could occur if the flare should fail, it is strongly advised that pre-flared lines should be installed when repairing the braking system. If a line were to leak brake fluid due to a defective flare, and the leak were to go undetected, brake failure would result.


WARNING
A double flaring tool must be used as single flaring tools cannot produce a flare strong enough to hold the necessary pressure.

  1. Determine the length of pipe needed. Allow 1 / 8 in. (3.2 mm) for each flare. Cut using an appropriate tool.
  2.  
  3. Square the end of the tube with a file and chamfer the edges. Remove any burrs.
  4. &n