GM Cadillac Deville_Fleetwood_ELD_Seville 1990-1998

Brake Caliper

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REMOVAL & INSTALLATION



1990 Deville and Fleetwood


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Fig. Bottom the piston in the caliper bore using pliers



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Fig. Disc brake caliper-1990 Deville and Fleetwood



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Fig. Lubricate the inside diameter of the bushings



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Fig. Caliper to bracket clearance-1990 Deville and Fleetwood

  1. If equipped with anti-lock brakes, depressurize the hydraulic accumulator. Refer to Teves Mk II Anti-Lock Brake System.
  2.  


CAUTION
The hydraulic system contains brake fluid at extremely high pressure. It is mandatory that the system be depressurized before disconnecting any hoses, lines or fittings, or personal injury may result.

  1. Use a syringe or similar tool to remove 2 / 3 of the brake fluid from the master cylinder reservoir.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the wheel and tire assembly, then reinstall 2 lug nuts to retain the disc brake rotor.
  6.  
  7. Position suitable pliers over the inboard brake pad and the inboard caliper housing to bottom the piston in the caliper.
  8.  
  9. If the caliper is to be removed from the vehicle, remove the bolt attaching the brake hose to the caliper. Discard the gaskets. Plug the openings in the caliper and brake hose to prevent fluid loss.
  10.  
  11. Remove the caliper mounting bolt and sleeve assemblies, then remove the caliper from the rotor and mounting bracket. If only the brake pads are being replaced, suspend the caliper with wire from the coil spring.
  12.  


WARNING
Do not let the caliper hang from the brake hose. The hose may become damaged, causing possible brake failure.

To install:

  1. Inspect the mounting bolt and sleeve assemblies for corrosion and the bushings for cuts and nicks. Replace parts as necessary; do not try to polish away corrosion.
  2.  
  3. Coat the inside diameter of the bushings with silicone grease, then install the caliper over the rotor in the mounting bracket.
  4.  
  5. Install the mounting bolt and sleeve assemblies and tighten to 38 ft. lbs. (51 Nm).
  6.  
  7. Measure the clearance between the caliper and the bracket stops, it should be 0.005-0.012 in. (0.13-0.30mm). If the clearance is not as specified, remove the caliper and file the ends of the bracket stops until the proper clearance is obtained.
  8.  
  9. Connect the brake hose to the caliper with the attaching bolt, using new gaskets. Tighten the bolt to 33 ft. lbs. (45 Nm).
  10.  
  11. Bleed the brake system.
  12.  
  13. Install the wheel and tire assembly and lower the vehicle.
  14.  
  15. Check the brake fluid level in the master cylinder and add fluid as necessary.
  16.  

1990-91 Eldorado and Seville


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Fig. Disc brake caliper-1990-91 Eldorado and Seville



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Fig. Bolt boot and support bushing-1990-91 Eldorado and Seville

  1. On 1990 vehicles with anti-lock brakes, depressurize the hydraulic accumulator. Refer to Teves Mk II Anti-Lock Brake System.
  2.  


CAUTION
The hydraulic system contains brake fluid at extremely high pressure. It is mandatory that the system be depressurized before disconnecting any hoses, lines or fittings, or personal injury may result.

  1. Use a syringe or similar tool to remove 2 / 3 of the brake fluid from the master cylinder reservoir.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the wheel and tire assembly, then reinstall 2 lug nuts to retain the disc brake rotor.
  6.  
  7. If the caliper is to be removed from the vehicle, remove the bolt attaching the brake hose to the caliper. Discard the gaskets. Plug the openings in the caliper and brake hose to prevent fluid loss.
  8.  
  9. Remove the caliper mounting bolts, then remove the caliper from the rotor and mounting bracket. If only the brake pads are being replaced, suspend the caliper with wire from the coil spring.
  10.  


WARNING
Do not let the caliper hang from the brake hose. The hose may become damaged, causing possible brake failure.

To install:

  1. Inspect the bolt boots and mounting bracket support bushings for cuts, tears or deterioration and replace as necessary. Inspect the mounting bolts for corrosion and replace them and the bushings if any is found; do not try to polish away corrosion.
  2.  
  3. Position the caliper over the rotor in the mounting bracket, making sure the bolt boots are in place.
  4.  
  5. Lubricate the shaft of the mounting bolts with silicone grease. Install the bolts and tighten to 63 ft. lbs. (85 Nm).
  6.  
  7. Position the brake hose on the disc brake caliper. Connect the hose to the caliper using the attaching bolt and 2 new gaskets. Tighten the bolt to 32 ft. lbs. (44 Nm).
  8.  
  9. Bleed the brake system.
  10.  
  11. Install the wheel and tire assembly and lower the vehicle.
  12.  
  13. Check the brake fluid level in the master cylinder and add fluid as necessary.
  14.  

1991-93 Deville and Fleetwood; 1992-98 Eldorado and Seville
  1. Use a syringe or similar tool to remove 2 / 3 of the brake fluid from the master cylinder reservoir.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the wheel and tire assembly, then reinstall 2 lug nuts to retain the disc brake rotor.
  6.  
  7. If the caliper is to be removed from the vehicle, remove the bolt attaching the brake hose to the caliper. Discard the gaskets. Plug the openings in the caliper and brake hose to prevent fluid loss.
  8.  
  9. Install a large C-clamp over the top of the caliper housing and against the back of the outboard pad. Slowly tighten the C-clamp until the piston is pushed into the caliper far enough to slide the caliper off the rotor.
  10.  
  11. Remove the caliper mounting bolts and sleeves, then remove the caliper. If only the brake pads are being replaced, suspend the caliper with wire from the coil spring.
  12.  


WARNING
Do not let the caliper hang from the brake hose. The hose may become damaged, causing possible brake failure.

To install:

  1. Inspect the mounting bolt and sleeve assemblies for corrosion and the bushings for cuts and nicks. Replace parts as necessary; do not try to polish away corrosion.
  2.  
  3. Coat the inside diameter of the bushings with silicone grease.
  4.  
  5. Install the mounting bolt and sleeve assemblies through the bushings using hand pressure only. If greater than hand force is required or mechanical assistance is needed, remove the mounting bolt and sleeve assemblies along with the bushings.
  6.  
  7. Inspect the mounting bores for corrosion. If there is any corrosion, remove it using a 1 in. wheel cylinder honing brush. Clean the mounting bores with clean denatured alcohol, replace the bushings and lubricate.
  8.  
  9. Install the caliper over the rotor in the mounting bracket. Tighten the mounting bolts to 38 ft. lbs. (51 Nm).
  10.  
  11. Position the brake hose on the disc brake caliper. Connect the hose to the caliper using the attaching bolt and 2 new gaskets. Tighten the bolt to 32 ft. lbs. (44 Nm).
  12.  
  13. Bleed the brake system.
  14.  
  15. Install the wheel and tire assembly and lower the vehicle.
  16.  
  17. Check the brake fluid level in the master cylinder and add fluid as necessary.
  18.  

OVERHAUL




NOTE
Some vehicles may be equipped dual piston calipers. The procedure to overhaul the caliper is essentially the same with the exception of multiple pistons, O-rings and dust boots.

  1. Remove the caliper from the vehicle and place on a clean workbench.
  2.  


CAUTION
NEVER place your fingers in front of the pistons in an attempt to catch or protect the pistons when applying compressed air. This could result in personal injury!


NOTE
Depending upon the vehicle, there are two different ways to remove the piston from the caliper. Refer to the brake pad replacement procedure to make sure you have the correct procedure for your vehicle.

  1. The first method is as follows:
    1. Stuff a shop towel or a block of wood into the caliper to catch the piston.
    2.  
    3. Remove the caliper piston using compressed air applied into the caliper inlet hole. Inspect the piston for scoring, nicks, corrosion and/or worn or damaged chrome plating. The piston must be replaced if any of these conditions are found.
    4.  

  2.  



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Fig. For some types of calipers, use compressed air to drive the piston out of the caliper, but make sure to keep your fingers clear



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Fig. Withdraw the piston from the caliper bore

  1. For the second method, you must rotate the piston to retract it from the caliper.
  2.  
  3. If equipped, remove the anti-rattle clip.
  4.  



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Fig. On some vehicles, you must remove the anti-rattle clip

  1. Use a prytool to remove the caliper boot, being careful not to scratch the housing bore.
  2.  



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Fig. Use a prytool to carefully pry around the edge of the boot . . .



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Fig. . . . then remove the boot from the caliper housing, taking care not to score or damage the bore

  1. Remove the piston seals from the groove in the caliper bore.
  2.  



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Fig. Use extreme caution when removing the piston seal; DO NOT scratch the caliper bore

  1. Carefully loosen the brake bleeder valve cap and valve from the caliper housing.
  2.  
  3. Inspect the caliper bores, pistons and mounting threads for scoring or excessive wear.
  4.  
  5. Use crocus cloth to polish out light corrosion from the piston and bore.
  6.  
  7. Clean all parts with denatured alcohol and dry with compressed air.
  8.  

To assemble:

  1. Lubricate and install the bleeder valve and cap.
  2.  
  3. Install the new seals into the caliper bore grooves, making sure they are not twisted.
  4.  
  5. Lubricate the piston bore.
  6.  
  7. Install the pistons and boots into the bores of the calipers and push to the bottom of the bores.
  8.  
  9. Use a suitable driving tool to seat the boots in the housing.
  10.  



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Fig. Use the proper size driving tool and a mallet to properly seal the boots in the caliper housing

  1. Install the caliper in the vehicle.
  2.  
  3. Install the wheel and tire assembly, then carefully lower the vehicle.
  4.  
  5. Properly bleed the brake system.
  6.  



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Fig. There are tools, such as this Mighty-Vac, available to assist in proper brake system bleeding

 
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