Chapter 3 Brake Tools, Shop Equipment, and Service Information 35 Copyright by Goodheart-Willcox Co., Inc. Sometimes a brake system line or port must be left open while other brake service is performed. To keep water and dirt out of the system at these times, plugs are used to cap off the opening until the brake system can be reassembled. Power Brake Service Tools A typical tool needed to service vacuum power brakes is the pushrod height gauge. Other vacuum power brake tools include spanners which allow the two halves of the booster to be separated, and special seal removers and installers. Special tools for use with power brakes are shown in Figure 3-21. Th ese tools are needed to test, disassemble, and reassemble the power booster unit. Bleeder screw Clear hose Brake caliper Jar Clean brake fluid Chrysler Figure 3-20. Bleeding a brake caliper with a clear hose and jar to catch fluid. Always keep the jar end of the hose submerged in brake fluid. Power brake unit Spanner wrench Pushrod-to-piston clearance Nuts Vacuum pump 500 mm Hg (20 in. Hg) Vise Installing tool Rear bearing and vacuum seal Rear shell Adjust pushrod screw to provide a slight pressure (approximately 5 lbs.) against the gauge Holding fixture A B C D Pushrod height gauge Power unit Booster check valve Honda, General Motors, Ford Figure 3-21. Special power booster service tools. There are a large number of different tools. A—Spanner wrench being used to separate housings. B—Using a vacuum pump to check pushrod-to-piston clearance. C—Special driver tool being used to install a bearing and vacuum seal. D—Pushrod height gauge being used to adjust pushrod.