III. Brake System Inspection

Front and Rear Disc





1. Remove the front and rear wheels using the "Wheel Removal" procedures in the "1991-1993 Chassis Service Manual."

2. Inspect the rotors for signs of increased heat and wear:

The braking surface of a rotor develops a "glaze" during normal use. This glaze is expected and desired. It is caused by the combination of compression and heat between the brake shoes and the rotor. This glaze does not indicate increased heat, is a normal condition, and improves brake performance and durability.

The braking surface of a rotor which has been only slightly overheated may appear normal. The brake surface of a rotor which has been overheated will appear very corroded The surface may also be blistered or flaking and the rotor must be replaced.

3. If the vehicle exhibited brake pedal pulsation, vibration and/or roughness, measure rotor runout and thickness variation using the "Inspecting and Refinishing Brake Rotors" procedures in the "1991-1993 Brakes Service Manual."

4. Replace or refinish the rotors if necessary, using the "Inspecting and Refinishing Brake Rotors" procedures in the "1991-1993 Brakes Service Manual."

5. Remove front and rear brake pads using the "Front Pads" and "Rear Pads" removal procedures in the "1991-1993 Brakes Service Manual."








6. Inspect the brake pads. A brake pad which has been overheated may show any or all of the following characteristics:

a. Paint discoloring, blistering or corrosion on the thin metal insulator, side of lining material and/or back of shoe.

b. Viton (fibrous material between thin metal insulator and shoe on back of pad) extruding from slots in insulator and sides of shoe.

c. Metal insulator separating from the back of shoe.

7. Install new disc brake pads if any of the above conditions are present using the "Front Pads" and/or "Rear Pads" installation procedures in the "1991-1993 Brakes Service Manual."

Rear Drum





1. Remove the rear drums using the "Rear Drum Removal" procedure in the "1991-1993 Brakes Service Manual."

2. Inspect the drums for signs of increased heat and wear. A drum which has been overheated may show any or all of the following characteristics:

a. Paint blistering, discoloring or missing on the outer shell. Drums are painted black in color on the outer surfaces from a point outboard of the wheel mounting surface around on the outside of the drum shell. Some amount of discoloration and/or corrosion is normal and increases with age and exposure. Increased corrosion, discoloration and/or paint loss may indicate increased heat.





b. Blueing of the drum material. The blueing will be most noticeable on the inside corner between the braking surface and the drum mounting web. In almost all cases, blueing of the drum material indicates increased heat.

IMPORTANT:
Natural sunlight or a bright shop light will help detect blueing. Blueing frequently can not be seen under normal lighting, unless it is severe.

3. If the vehicle exhibited brake pedal pulsation, vibration and/or roughness, or drum has been overheated, measure drum runout using a dial indicator with the drum mounted on a brake lathe.

4. If any of the above conditions are present, replace or refinish the drums using the "Inspecting and Refinishing Brake Drums" procedures in the "1991-1993 Brakes Service Manual."

5. Inspect and replace all other rear drum brake components as necessary using the "Rear Drum Brakes Disassembly and Assembly" procedures in the "1991-1993 Brakes Service Manual."