This condition usually always presents itself on the primary piston due to the duo-servo design of the brakes. If this happens the wheel cylinder piston will be forced out of its bore when the brakes are applied. The amount of movement will increase over time. If left unchecked the wheel cylinder can rotate to a point where the wheel cylinder piston no longer contacts the brake shoe. This method works adequately as long as the backing plate and wheel cylinder are in good shape. As corrosion takes place the hole in the backing plate enlarges as shown in Figure 63.3 and the wheel cylinder casting deteriorates. The backing plate is shaped like that shown in Figure 63.2. The backing plate and wheel cylinder are shaped to fit together in a way that is supposed to prevent the wheel cylinder from rotating. Instead of bolting the wheel cylinder to the backing plate they use a retaining clip as shown in Figure 63.1. GM has used a different method on a number of their vehicles since the late 70’s. Most wheel cylinders are bolted to the backing plate.
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