GM Cadillac Deville_Fleetwood_ELD_Seville 1990-1998

Master Cylinder

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BENCH BLEEDING




WARNING
All new master cylinders should be bench bled prior to installation. Bleeding a new master cylinder on the vehicle is not a good idea. With air trapped inside, the master cylinder piston may bottom in the bore and possibly cause internal damage.

  1. Secure the master cylinder in a bench vise using soft jaws.
  2.  
  3. Remove the master cylinder reservoir cap.
  4.  
  5. Manufacture or purchase bleeding tubes and install them on the master cylinder as illustrated.
  6.  
  7. Fill the master cylinder reservoir with clean, fresh brake fluid until the level is within 0.25 in. of the reservoir top.
  8.  


NOTE
Ensure the bleeding tubes are below the level of the brake fluid, otherwise air may get into the system making your bleeding efforts ineffective.

  1. Use a blunt tipped rod (a long socket extension works well) to slowly depress the master cylinder piston. Make sure the piston travels full its full stroke.
  2.  
  3. As the piston is depressed, bubbles will come out of the bleeding tubes. Continue depressing and releasing the piston until all bubbles cease.
  4.  
  5. Refill the master cylinder with fluid.
  6.  
  7. Remove the bleeding tubes.
  8.  
  9. Install the master cylinder reservoir cap.
  10.  
  11. Install the master cylinder on the vehicle.
  12.  

REMOVAL & INSTALLATION



Catera

This brake master cylinder is a composite design (plastic reservoir and aluminum body). The brake master cylinder incorporates a conventional front to the rear brake system split. The brake master cylinder reservoir on this vehicle is a one-piece plastic design. The brake master cylinder reservoir can be serviced separately from the brake master cylinder. The brake master cylinder primary piston provides the fluid pressure to the front disc brakes, while the master cylinder secondary piston provides the fluid pressure to the rear brake system. If pressure is lost from either system, the remaining system continues to function if pressure is lost from either system.

  1. Lubricate the rubber parts with the silicone grease provided in the kits to ease installation.
  2.  
  3. Do not use lubricated shop air on brake parts or damage to the rubber parts may result.
  4.  
  5. Remove the reservoir cap and, using a syringe, remove as much brake fluid as possible from the master cylinder reservoir before removing.
    1. Dispose of brake fluid. DO NOT reuse.
    2.  
    3. Reinstall the reservoir cap before proceeding.
    4.  

  6.  
  7. Remove the reservoir from the cylinder body by using a light upward rocking motion.
  8.  
  9. Unbolt the power steering reservoir bracket and move the power steering reservoir towards the engine slightly.
  10.  
  11. Uncouple the brake pipes from the master cylinder.
    1. Plug the open pipes to prevent brake fluid from contacting the painted surfaces and/or becoming contaminated.
    2.  

  12.  
  13. Unbolt the master cylinder attaching nuts and remove the master cylinder from the vehicle.
  14.  
  15. Remove the master cylinder seal from the brake master cylinder.
  16.  

To install:

  1. Install a new brake master cylinder seal to the brake master cylinder.
  2.  
  3. Put the brake master cylinder into the mounting position on the vehicle and secure it with the attaching nut. Tighten the nuts to 16 ft. lbs. (22 Nm).
  4.  
  5. Couple the brake pipes to the master cylinder. Tighten to 12 ft. lbs. (16 Nm).
  6.  
  7. Return the power steering reservoir bracket to its original mounting and secure it by tightening the bolt to 62 inch lbs. (7 Nm).
  8.  
  9. Lubricate the reservoir grommets and reservoir flanges with brake fluid and install the reservoir to the cylinder body by pushing downward with a light rocking motion.
  10.  
  11. Fill the master cylinder/reservoir with brake fluid and bleed the brake system.
  12.  

1990-93 Deville And Fleetwood
  1. Disconnect the negative battery cable.
  2.  
  3. Using a syringe, remove as much brake fluid as possible from the master cylinder reservoir before removing.
    1. Dispose of brake fluid. DO NOT reuse.
    2.  
    3. Reinstall the reservoir cap before proceeding.
    4.  

  4.  
  5. Detach the electrical connector from the fluid level sensor switch.
  6.  
  7. Disconnect the brake lines from the master cylinder and proportioning valves. Plug the lines and master cylinder and proportioning valve ports to prevent fluid loss.
  8.  
  9. Remove the master cylinder mounting nuts and remove the master cylinder.
  10.  

To install:

  1. Position the master cylinder on the power brake booster and install the mounting nuts. Tighten to 20 ft. lbs. (27 Nm).
  2.  
  3. Connect the brake lines and tighten the fittings to 11 ft. lbs. (15 Nm).
  4.  
  5. Connect the electrical connector to the fluid level sensor switch and connect the negative battery cable.
  6.  
  7. Fill the master cylinder and bleed the brake system.
  8.  



Click image to see an enlarged view

Fig. Master cylinder installation-1990 models



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Fig. Master cylinder installation-Deville and Fleetwood



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Fig. Removing the master cylinder reservoir-Deville and Fleetwood



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Fig. Installing the master cylinder reservoir-Deville and Fleetwood

1990-91 Eldorado And Seville


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Fig. Master cylinder installation-1990-91 Eldorado and Seville

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector from the fluid level sensor switch.
  4.  
  5. Disconnect the brake lines from the master cylinder and proportioning valves. Plug the lines and master cylinder and proportioning valve ports to prevent fluid loss.
  6.  
  7. Remove the master cylinder mounting nuts and remove the master cylinder.
  8.  

To install:

  1. Position the master cylinder on the power brake booster and install the mounting nuts. Tighten to 20 ft. lbs. (27 Nm).
  2.  
  3. Connect the brake lines. Tighten the brake line-to-proportioning valve fittings to 11 ft. lbs. (15 Nm) and the brake line-to-master cylinder fittings to 24 ft. lbs. (32 Nm).
  4.  
  5. Connect the electrical connector to the fluid level sensor switch and connect the negative battery cable.
  6.  
  7. Fill the master cylinder and bleed the brake system.
  8.  

1992-98 Eldorado And Seville and 1994-98 Deville

This brake master cylinder is a composite design (plastic reservoir and aluminum body) to be used in a diagonally split system (one front and one diagonally opposite front and rear brake served by the primary piston, and the opposite front and rear brakes served by the secondary piston). It incorporates the functions of a standard dual master cylinder; in addition, it has a fluid level sensor switch and front reservoir access for use with Traction control.

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector from the fluid level sensor.
  4.  
  5. Using a syringe, remove as much brake fluid as possible from the master cylinder reservoir before removing.
  6.  
  7. If equipped with anti-lock brakes, drain the brake fluid from the master cylinder reservoir, then disconnect, and plug the reservoir hose.
    1. Dispose of brake fluid. DO NOT reuse.
    2.  
    3. Reinstall the reservoir cap before proceeding.
    4.  

  8.  
  9. Detach the electrical connector from the fluid level sensor switch.
  10.  
  11. Disconnect the brake lines from the master cylinder. Plug the lines and master cylinder ports to prevent fluid loss.
  12.  
  13. Remove the master cylinder mounting nuts and remove the master cylinder.
  14.  
  15. If the vehicle is equipped with anti-lock brakes and the master cylinder is being replaced, remove the master cylinder reservoir as follows:
    1. Clamp the mounting flange on the master cylinder body in a vise. Do not clamp on the master cylinder body.
    2.  
    3. Tap back the spring pins until they are clear of the reservoir. Be careful not to damage the reservoir or master cylinder.
    4.  
    5. Remove the reservoir and the reservoir seals. Inspect the reservoir for cracks or deformities and replace as necessary.
    6.  

  16.  



Click image to see an enlarged view

Fig. Master cylinder installation-Eldorado and Seville

To install:

  1. If the vehicle is equipped with anti-lock brakes and the master cylinder is being replaced, install the master cylinder reservoir as follows:
    1. Clean the reservoir with clean denatured alcohol and dry with unlubricated compressed air.
    2.  
    3. Lubricate new seals and the reservoir bayonets with clean brake fluid.
    4.  
    5. Install the seals on the master cylinder, making sure they are fully seated.
    6.  
    7. Install the reservoir onto the master cylinder by pressing straight down by hand until the pin holes are aligned.
    8.  
    9. Tap in the pins to retain the reservoir, being careful not to damage the reservoir or master cylinder.
    10.  

  2.  
  3. Position the master cylinder on the power brake booster and install the mounting nuts. Tighten to 20 ft. lbs. (27 Nm).
  4.  
  5. Connect the brake lines and tighten the fittings to 11 ft. lbs. (15 Nm).
  6.  
  7. If equipped with anti-lock brakes, connect the reservoir hose.
  8.  
  9. Connect the electrical connector to the fluid level sensor and connect the negative battery cable.
  10.  
  11. Fill the master cylinder and bleed the brake system.
  12.  

 
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