GM E Body 12" Front Brake Conversion Installation

GM E Body

12" Front brake conversion installation instructions

1988-1991 GM E-Body cars were equipped with 10.8" Front rotors. If you do a lot of high speed stops, these rotors will easily warp. This may work on 86-87 cars, but I haven't had one here to verify this. In 1992 the brakes were upgraded so this would not really be necessary on these cars. The spindle is different in 92, so that package wouldn't be a bolt on for the older models.

NOTE: 15" rims will not clear this brake package. Most 16" and larger will work. 90-91 Trofeo 16" rims will hit the caliper, but similar looking 1992 rims will fit.

Complete conversion kit: $460.00 Includes shipping in the cont. US.
To order or request information, click here
Includes all parts necessary for the conversion. You will need regular hand tools for installation.

Here's the comparison. In the top photo the left is the upgrade rotor, on the right is the stock one. It was due for replacement anyway. Below, it should be just as easy to tell the difference

Now for the "how to"

First the basic, jack car, remove tires, be sure car is supported by stands on a solid surface, etc. If you need this explained to you, don't try this at home.

Now you can install the rotor and caliper, attach the brake hose and bleed the brakes.

Due to the age of these cars and since you've already got half the system apart, it would be a good idea to bleed the whole brake system. Brake fluid tends to absorb moisture. By changing the fluid, you not only protect your brake parts, but it raises the boiling temperature of the fluid allowing for even more stopping power!

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The first step is to drill the caliper mount holes on the spindle to 9/16" for the larger bolts to pass through.

Now with the caliper and rotor off, you can begin the modification process.

Start by removing the brake hose (save the bolt) and the caliper mounting bracket bolts. You can toss the caliper bracket mounting bolts, as you'll be replacing them. Now remove the caliper and brake rotor.

Once you have the wheels off, this is what you will see: