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Assignment 6 Disc Brake Service Name(S) ______ Assign_6_disc_brake Assignment 6 Disc Brake Service Name(s) _________________________________________________ BE SURE TO SAVE THIS FILE before, during and after completing your work. (Hint – if you write your name, then save and close this, your name will still appear when you re-open the file) Questions #1 – 19 can be answered after studying the information in Chapter 12 of Automotive Chassis Systems by James Halderman 1) Why are disc brakes superior to drum brakes? 2) Explain how disc brakes are self-adjusting. (pg196) 3) Disc brake calipers do not use any type of return spring. How do caliper pistons release pressure on the pads when the brake pedal is released? (see figure 12-5) 4) Brake noise (squeaking or squealing) is a problem with disc brakes. What causes disc brakes to be noisy? 5) List at least 4 methods that are commonly used to prevent disc brake noise. Page 1 of 6 6) Explain how a mechanical pad wear indicator (often called a squealer) operates. 7) Some vehicles have an electrode for the disc brake pad wear indicator. How does it work? 8) Explain the advantages and dis-advantages of Semimetallic disc brake pad materials. 9) Explain the advantages and dis-advantages of NonAsbestos brake pad materials. 10) What type of disc brake pad material should you use for any vehicle? (ask in class if you are not sure of this answer) 11) What does an SAE brake pad Edge Code tell you? 12) What is the difference between a solid and a vented rotor? 13) What is the difference between a fixed and floating caliper? 14) Why do high performance and many European vehicles use fixed calipers? Page 2 of 6 15) What is the difference between Floating and Sliding calipers? 16) If you are replacing brake pads on a Floating caliper – but not replacing the caliper, what caliper parts should you replace along with the brake pads? 17) Both floating and sliding calipers require lubrication during brake service. What type of lubrication should you use? 18) What happens if the sliding or floating surfaces in a caliper are not lubricated? 19) What are two strategies for parking brakes when 4 wheel disc brakes are used? Questions #20 – 34 can be answered after studying the information in Chapter 13 of Automotive Chassis Systems by James Halderman 20) When diagnosing disc brake problems you should make sure the pedal does not go to low. What should you check FIRST if there is a low brake pedal? 21) Explain (in detail) the Bleed and Squirt test found in the Tech Tip on page 213. Page 3 of 6 22) When installing new brake pads you need to push the piston back into the caliper. Why should you ALWAYS open the bleeder screw before pushing on the piston? 23) Sometimes you cannot open a bleeder screw as it is rusted shut. What should you do if the bleeder screw is rusted shut? (ask in class- not in the book) 24) Many calipers are connected to the brake hose using a hollow Banjo Bolt. What should be replaced EVERY TIME the banjo bolt is removed? (figure 13-8) 25) Why should you NEVER ALLOW A CALIPER TO HANG ON THE BRAKE HOSE? (ask in class! This is a VERY important precaution) 26) Disc brake calipers should NEVER be allowed to hang on the rubber brake hose. How can you avoid damaging the hose when removing the caliper? (figure 13-10) 27) What is a loaded caliper? (pg 220) 28) Why do you have to rotate the piston on some types of rear disc brake calipers? 29) What is the maximum clearance between rotor and pads after rotating the piston? Page 4 of 6 30) What may happen if you do not check the rotor to pad clearance on rear calipers? 31) After replacing brake pads, or replacing a caliper, what should you do BEFORE driving the vehicle? 32) How should you “Burnish” or break in a new set of brake pads? 33) What should you tell the customer about how to drive after replacing brakes? 34) Explain at least 4 important methods to keep disc brakes from squealing. Page 5 of 6 Identify each components in the picture above A) _________________________________________________ B) _________________________________________________ C) _________________________________________________ D) _________________________________________________ E) _________________________________________________ Page 6 of 6 .
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