48 Auto Brakes Copyright by Goodheart-Willcox Co., Inc. Summary Th e professional brake technician should always choose quality tools and the correct tool for the job. Brake ser- vice requires many specialty tools. Basic brake hand tools include bleeder wrenches and fl are-nut wrenches, tubing cutters, reamers, tubing benders, and fl aring tools. In addi- tion to standard types of pliers, special brake pliers are oft en needed. Brake adjusters, spring removal tools, Allen and Torx bits, and C-clamps are very useful. To safely and effi ciently service brakes, they must be thoroughly cleaned. Th e two types of cleaning systems are vacuum cleaners and wet cleaners. Precautions should always be taken to ensure that as little brake dust enters the atmosphere as possible. Th e best type of dry cleaning system uses a HEPA fi lter. Wet cleaning should be done gently at fi rst to wet down the dust before washing it off . Wheel cylinder, master cylinder, and caliper bores can sometimes be honed to smooth up any roughness. Th ere are two types of hones, the rigid-stone hone and the fl ex- ible abrasive type. Never hone coated or anodized cylinders unless specifi ed by the manufacturer. For precision brake work, numerous specialty measur- ing tools are needed. Th ey include rotor and drum microm- eters, brake shoe adjusting gauges, dial indicators, and hydraulic pressure gauges. Brake specialty tools include hydraulic system service tools, seal and dust boot installers, wheel bearing service tools, and power brake tools. Th e modern brake technician needs several electrical and electronic testers, including test lights, multimeters, and scan tools. Tools should always be properly cared for and stored. Never use a tool the wrong way and always repair or replace tools that are damaged. Th e two main types of brake system bleeders are pres- sure and vacuum operated. Brake lathes are made in two general types, bench or vehicle mounted. Some older shops use brake drum grinders and burnishing tools. Be sure to prevent exposure to asbestos fi ber dust during this proce- dure. A hydraulic press is oft en needed to perform some brake service. Most service information is provided electronically through CDs and fl ash drives, and through Internet con- nections. Some printed information is still available. Review Questions—Chapter 3 Answer the following questions using the information provided in this chapter. 1. Quality tools will pay for _____. 2. To remove glaze and deposits from wheel cylinders, a brake _____ should be used. 3. A(n) _____ is used to measure the thickness of rotors. If a rotor is too thin, it should be _____. 4. A dial indicator can be used to check for out-of-round _____. 5. A brake hydraulic pressure gauge must be able to read a minimum of _____ psi or _____ kPa. 6. To quickly test for voltage in a brake light system, use a(n) _____. 7. True or False? Multimeters can check for voltage and hydraulic pressure. 8. True or False? Scan tools are used to test anti-lock brake systems. 9. True or False? Bench-mounted brake lathes can only turn drums. 10. A rotor is turned using _____ cutting bits.