182 Auto Brakes Copyright by Goodheart-Willcox Co., Inc. Figure 12-14. Other vehicles have a special adapter or bracket that bolts to the spindle. Th e caliper is then bolted to the adapter. A caliper with a bolt-on adapter is shown in Figure 12-15. are called guide pins or slider pins. To reduce wear of the caliper metal, the guide pins contact bushings, sometimes called sleeves. Th e actual movement between the bolts and caliper is through these bushings. On other vehicles, particularly light trucks and vans, the sliding takes place between machined ways. A way is a fl at surface designed to allow smooth movement between itself and another component that slides over it. Both the caliper and the spindle mounting surfaces are machined smooth so they can move against each other with a mini- mum of friction. See Figure 12-10. Caliper movement over the ways is controlled by the use of supports, sometimes called support keys. Th ese sup- ports may be held in place by a single mounting screw, Figure 12-11. A leaf spring, usually referred to as a clip, cuts down on caliper rattling. On other calipers, the sliding action is controlled and damped by one-piece combination metal and rubber bushings, Figure 12-12. Some disc brake calipers have only one pin, and the side away from the rotor is installed on a machined way, Figure 12-13. One- and two-piston calipers may be installed on an integral cast extension of the spindle, as shown in Machined ways Machined ways Caliper housing Anchor plate Key retaining screw Caliper support key Caliper support spring Anti-rattle spring Anti-rattle spring Retainer clip Rotor (ventilated) Caliper A B Machined ways Cast-iron caliper Caliper mounting screw Anti-rattle spring Retaining clip O-ring Machined ways Adapter Caliper mounting screw Ford Figure 12-10. One type of floating caliper and anchor plate showing the machined ways. Chrysler Figure 12-11. A single-piston floating caliper. A—Overall view. B—Exploded view. Note the caliper mounting screws, retaining clips, and O-rings, which hold the caliper and adapter plate together at the proper tension.