GM: Electra/Park Avenue/Ninety-Eight 1990-1993

Brake Hoses and Pipes

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Fig. Fig. 1 Front brake hose and related parts



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Fig. Fig. 2 Rear brake hose and related parts

Brake hoses are rubber-wrapped 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. The calipers and wheel cylinders are unsprung (ride along with the wheels) and the metal brake lines coming from the master cylinder are suspended by the vehicle's springs, along with the frame and body. The flex hoses permit the hydraulic force of the brake fluid to be transmitted to the wheels even though they are moving up and down in relation to the frame. The flexing can cause the hoses to wear, especially if the surface of a hose should rub against the frame or a suspension component. Inspect the hoses frequently and replace them if the rubber cover has cracked or deteriorated, or if there is any sign of leakage or expansion.

REMOVAL & INSTALLATION



Front
  1. Remove the through bolt that fastens the hose to the caliper. Remove the washers, noting that there is one on either side of the fitting at the caliper end of the hose, and disconnect the hose.
  2.  
  3. If there is a clip retaining the connection at the frame, remove it. Then, unscrew the flare fitting located on the pipe running along the frame, using a backup wrench on the flats of the fitting at the end of the brake hose. Remove the brake line.
  4.  
  5. Install in reverse order, using new washers and torquing the connection at the caliper to 33 ft. lbs. (40 Nm). Bleed the system.
  6.  

Rear
  1. Remove the clips at either end of the hose.
  2.  
  3. Unscrew the flared fitting located on the pipe running along the frame, using a backup wrench on the flats of the fitting at the end of the brake hose. Do the same with the flared fitting on the wheel cylinder end.
  4.  
  5. Install in reverse order. Bleed the system.
  6.  

BRAKE PIPE FLARING





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Fig. Fig. 3 Cross-sectional of a correct iso flare

Always use double walled steel brake pipe when replacing brake pipes. Carefully route and retain the pipes, or they may brake without warning.

  1. Obtain the correct steel line. Cut pipe to correct length using old line as a guide, making new tube about 1 / 8 inch longer to allow for flare.
  2.  
  3. Install fittings onto pipe.
  4.  
  5. Using tool J 29803, or an equivalent iso flaring tool, chamfer the inside and outside of pipe with de-burring tool.
  6.  
  7. Clean lubricate from tube and clamp in flaring vise.
  8.  
  9. Select correct collet and mandrel.
  10.  
  11. Following directions from flaring tool, form inner flare, then using proper tools, form the double flared end.
  12.  

Many part suppliers offer brake lines that are already flared, or if you bring in your brake line they will flare it for you. Remember the flare must be performed properly to safely handle the hundreds of pounds of pressure.

 
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