Mechanics

REPLACING BRAKE PADS

1990 Oldsmobile 88

Brakes problem
1990 Oldsmobile 88 6 cyl Front Wheel Drive Automatic 117000 miles

Can someone describe in clear simple english how to replace frond disk brake pads and rear drum brake pads. My shop manual is mysterious because it doesn't explain how to seperate the calipars from the brake and other obvious necessities. I hace the GM service manual for my 1990 88 Royal. Chilton is even worse. Does anyone know of a better source?

Sincerely,

Scott Michael Berger
Columbia, MD


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88Royale
March 9, 2009.



Hello

Replacement procedures for your brakes are below. If you don't understand a part of the procedures just let me know and I will break it down for you even more.

FRONT BRAKE PADS

Always replace all pads on both front wheels at the same time. Failure to do so will result in uneven braking action and premature wear.

REMOVAL & INSTALLATION

Disconnect the negative battery cable.
Remove 2/3 of the brake fluid from the master cylinder reservoir using a clean syringe or equivalent. Install the reservoir cap.
Raise and safely support the vehicle with jackstands.
Mark the relationship of the wheel to the hub and bearing assembly.
Remove the tire and wheel assembly.
Remove the caliper, as outlined later, and suspend from the strut with a wire hook or suitable piece of wire. Do NOT disconnect the brake hose or allow the caliper to hang from the brake line!
Remove the outboard shoe and lining (pad) by using a prytool to disengage the buttons on the shoe from the holes in the caliper housing.
Remove the inboard shoe and lining (pad) from the caliper.
Before installing new pads, clean the outside surface of the caliper boot with denatured alcohol, or equivalent.

To install: On 1987-90 vehicles, install new sleeves and bushings. Lubricate the sleeves with a light coating of silicone grease before installation. These parts must always be replaced when the pads are replaced. The parts are usually included in the pad replacement kits.
Bottom the piston into the caliper bore, using a C-clamp, adjustable pliers, or a tool specifically designed for that purpose. Position the tool over the caliper and piston, tightening it slowly to press the piston into the bore. Be careful not to damage the piston or piston boot.
After bottoming the piston, use a small plastic or wooden tool to lift the inner edge of the boot next to the piston, and press out any trapped air. Make sure the boot lies flat and that the convolutions are tucked back into place.
Install the inboard pad by snapping the pad retainer spring into the caliper piston. The shoe portion must lay flat against the piston. After installing the shoe and lining (pad), check that the boot is not touching the shoe. If it is, remove the pad and reseat or reposition the boot.
Install the outboard pad with the wear sensor at the trailing edge of the pad during forward wheel rotation. The back of the shoe must lay flat against the caliper.
Install the caliper, as outlined later in this section.
Install the wheel and tire assembly, then carefully lower the vehicle. Tighten the wheel lug nuts to 100 ft. Lbs. (136 Nm).
Fill the master cylinder with the proper amount of brake fluid from a fresh, sealed container. Install the reservoir cap.
Apply about 175 lbs. (778 N) of force to the brake pedal, three times, to seat the pads.

REAR BRAKE SHOES

REMOVAL & INSTALLATION

Raise and safely support the vehicle. Mark the relation ship of wheel to studs in the bearing flange, for reference during assembly. Remove the tire and wheel.
Mark the relationship of drum to the bearing flange, for reference during assembly. Remove the brake drum assembly. Clean the brake surfaces, using a commercially available brake cleaning fluid.
For additional clearance, you can remove the hub and bearing, prior to brake component removal, as follows: Unfasten the hub and bearing Torx retaining bolts, then carefully remove the hub and bearing.
Reinstall the hub retaining bolts to hold the brake backing plates and brake components in place.
Remove the actuator and the upper return spring with the proper tools.
Disconnect the spring connecting link, adjuster actuator and, if replacing the shoe and linings, the hold-down washer.
Remove the hold-down springs and the pins, using pliers or a special tool for that purpose.
Remove the adjuster screw assembly.
Unhook the left (adjuster) shoe and lining from the lower return spring.
Unhook the parking brake cable from the lever and the right shoe and lining, then remove the right shoe and lining from the vehicle.
If necessary, remove the retaining ring, pin and spring washer securing the parking brake lever to the shoe and lining.
Clean off the brake backing plate, then lubricate the backing plate as shown in the accompanying figure.
Inspect all of the brake components. If any of them are of doubtful strength or quality, due to discoloration from heat, overstress or wear, the parts should be replaced.
To install: Install the parking brake lever on the shoe and lining and retain with the spring washer, pin and retaining ring. Install the spring washer with the concave side against the parking brake lever.
Install the adjuster pin in the shoe and lining so that the pin projects 0.275-0.283 in. (7.0-7.2mm) from the side of the shoe web where the adjuster actuator is installed.
Disassemble, clean and reassemble the adjusting screw, as follows: Disassembly the adjusting screw.
Clean the adjusting screw threads with a wire brush, then wash all components with clean denatured alcohol.
Apply a suitable brake lubricant to the adjuster screw threads, the inside diameter of the socket and socket face.
You have achieved sufficient lubrication when a continuous bead of lubricant is on the end of the adjuster nut and the socket when the threads are fully engaged. Check the threads of the adjuster screw for smooth rotation over the full length.
Install the spring clip in the same position from which it was removed.
Do not stretch the lower return spring. The spring will be damaged if the extended length is greater than 3.88 in. (98.6mm).

Install the lower return spring between the shoe and linings.
Install the adjuster shoe and lining and shoe and lining (after connecting the parking brake cable) with the hold-down pins and springs.
The lower return spring should be positioned under the anchor plate. For cable adjustment, refer to the procedure located in this section.
The adjuster shoe and lining is the one in which the adjuster pin was installed in the shoe web. Install the adjuster shoe and lining to the front of the car on the left side brake assembly or to the rear of the car on the right side brake assembly.
Install the adjusting screw assembly between the adjuster shoe and lining and the other shoe and lining on the backing plate. Proper assembly of the adjusting screw is with the adjuster screw engaging the notch in the adjuster shoe and lining and the spring clip pointing toward the backing plate.
Install the spring washer with the concave side against the web of the adjuster shoe and lining.
Position the adjuster actuator so that its top leg engages the notch in the adjuster screw
Install the spring connecting link and hold in place.
Do not overstretch the upper return spring. The spring will be damaged if it is extended past 5.5 in. (114mm).

Install the upper return spring. Insert the angled hook end of the spring through the parking brake lever and shoe/lining assembly
Grasp the long, straight section of the spring with suitable brake spring pliers. Pull the spring straight across and then down to hook into the crook on the spring connecting link.
Do not overstretch the actuator spring. The spring will be damaged if it is stretched more than 3.27 in. (8.80mm).
Install the actuator spring with suitable pliers. Check to make sure the parking brake lever is at its stop and that the brake shoes are properly centered on the wheel cylinder pistons.
Install the brake drum, then adjust the brakes, as outlined later in this section.
Install the wheel and tire assembly, then carefully lower the vehicle.
Tighten the wheel lug nuts to 100 ft. Lbs. (113 Nm).

FRONT CALIPER REMOVAL & INSTALLATION

Disconnect the negative battery cable.
Remove the master cylinder reservoir cap, then remove the 2/3 of the fluid from the reservoir with a clean syringe and place it in a suitable container. Install the reservoir cap.
Raise and safely support the vehicle with jackstands.
Mark the relationship of the wheel to the hub and bearing assembly.
Remove the tire and wheel assembly.
Reinstall two of the lug nuts to retain the rotor.
Push the pistons into the caliper bore to provide clearance between the linings and the rotor, as follows: Install a large C-clamp over the top of the caliper housing and against the back of the outboard shoe.
If the C-clamp is tightening too far, the outboard shoe retaining spring will be deformed and require replacement.
Slowly tighten the C-clamp until the pistons are pushed into the caliper bore enough to slide the caliper assembly off the rotor.
If the caliper is going to be replaced or removed for overhaul, disconnect and plug the brake hose.
WARNING
Do NOT allow the caliper to hang from the brake hose!
Unfasten the caliper mounting bolts and sleeves, then pull the caliper from the mounting bracket and rotor. Support the caliper with a suitable piece wire from the strut, if not removing.
Inspect the mounting bolts and sleeves for corrosion and the support bushings for cuts or damage; replace if necessary.

To Install

Liberally coat the inside diameter of the bushings with silicone grease.
Position the caliper and brake pad assembly over the rotor.
Install the mounting bolts and sleeves. The bolts and sleeves should slide through the bushings with only hand pressure. If greater force or mechanical assistance is necessary, perform the following: Remove the bolts and sleeves, along with the bushings.
Inspect the mounting bores for corrosion. If the bores are corroded, remove it using a 1 in. (25mm) wheel cylinder honing brush.
Clean the bores with denatured alcohol.
Install the bushings and relubricate.
Tighten the caliper mounting bolts to 38 ft. Lbs. (51 Nm).
If removed, unplug and connect the brake hose, using new copper washers and a new inlet fitting bolt. Tighten the fitting bolt to 24 ft. Lbs. (7 Nm).
Remove the two wheel lugs, and install the wheel and tire assembly.
Carefully lower the vehicle.
Fill the master cylinder. If the brake line was disconnected, bleed the brake system as outlined in this section.
Check for hydraulic leaks. Pump the brake pedal a few times before moving the vehicle.

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