Document 2JjDZLEnZy8Q13GNQZ1ye5XpN

17 CHAPTER 2/BRAKE COMPONENTS After the bore has been honed or cleaned with a crocus cloth, it should be flushed with brake cleaner or alcohol, then wiped dry. Care should be taken not to hone the wheel cylinder exces sively; if the clearance exceeds . 005 inches, the cup may be pinched between the bore and piston, causing heel drag. Heel drag wears the cup rapidly and slows the piston retraction when the brakes are released. On automobiles manufactured in 1978 and after, General Motors eliminated wheel cylinder mounting bolts on some cars. The cylinders are held to the backing plate by a retaining ring. This ring is removed by inserting two awls into the access slot behind the retainer tabs and crossing the awls. The ring is reinstalled using a 1 `/a, 12-point socket wrench. The retainer ring should be replaced when the cylinder is serviced. SUMMARY This section has given you an overview of a number of important parts of automotive brake systems. Most of these are separate from what we usually think of as "brakes"; that is, the part of the brake system located at the wheels. Proper maintenance and repair of brake sys tems requires knowing what these parts are, what they do, and proper repair procedures. Keep these parts in mind as you study the com ponents of the drum brake system and the disc brake system since--if these parts are not kept in good repair--the drum or disc brakes won't work very well either. Notes