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  1. 1. Automotive Disc Brakes Automotive Technology
  2. 2. Disc Brakes <ul><li>Disc brakes are fairly simple to work with, once you know the parts and their functions. Typically, there are 4 main parts of a system: </li></ul><ul><li>Mounting Bracket </li></ul><ul><li>Rotor </li></ul><ul><li>Caliper </li></ul><ul><li>Pads </li></ul>
  3. 3. Mounting Brackets Mounting Brackets are used to hold the Caliper in place. Other than keeping the surface clean and free of rust and road grime, there is very little to be done with this part
  4. 4. Rotors Rotors are metal discs supported by the suspension. The Calipers clamp on to them to slow their rotation, and then slow or stop the car
  5. 5. Vented Rotor These are the VENTS
  6. 6. Vented Rotors Vented Rotors have Fins in the spaces between their machined surfaces. These spaces allow air to pass through, which helps carry heat away.
  7. 7. Nonvented Rotor Non Vented Rotors are used on smaller vehicles, and have no cooling fins
  8. 8. Non Vented Rotor
  9. 9. Rotor Repair We will get back to these Rotors later concerning what you can do as a repair on them.
  10. 10. Calipers Calipers are the housings that contain the Pistons and the Brake Pads. The Calipers are connected to the Hydraulic System, and hold the brake pads to the Rotor
  11. 11. Caliper Types <ul><li>There are 2 types of Calipers </li></ul><ul><li>Fixed </li></ul><ul><li>Floating </li></ul>
  12. 12. Fixed Caliper <ul><li>Fixed Calipers are disc brakes that use a caliper that is FIXED in position and does not slide. They have pistons on both sides of the disc. There may be 2 or 4 pistons per caliper </li></ul>
  13. 13. Fixed Caliper Motorcycles and some import trucks and cars use this type
  14. 14. Sliding Caliper <ul><li>Much more common </li></ul><ul><li>Single Piston </li></ul><ul><li>Easier to work with </li></ul><ul><li>On “inboard” side of caliper </li></ul>
  15. 15. Clean, Floating Caliper
  16. 16. Floating Calipers
  17. 17. Operation Piston applies pressure to Inboard pad. As the pad contacts the rotor, the caliper slides along the pins, pulling the outboard pad into contact. Caliper Rotor Piston Brake Pads Brake Line
  18. 18. Sliding caliper in operation
  19. 19. Parts of a Caliper
  20. 20. Seal The rebuild kit will have a new O ring, and a Dust Seal
  21. 21. Piston The Piston surface should be smooth and clean. This one is pitted, and needs replaced.
  22. 22. Adjustments? <ul><li>Disc Brakes will automatically self-adjust. </li></ul><ul><li>As the Pads wear, the caliper piston will not retract as far </li></ul><ul><li>This leaves a larger amount of brake fluid in the caliper, causing the master cylinder level to lower </li></ul>
  23. 23. Caliper Slides Notice where the brake pads and calipers slide on the pin and the mount
  24. 24. Caliper slides Since parts need to slide, these areas should be clean of dirt and rust,
  25. 25. Cleaning Caliper With the caliper off, I would use a wire brush to clean the rust off, then use a brake cleaning solvent to wash the sliding area.
  26. 26. Wear Indicators Brake pads wear, and most people never check them. So, something was put on the pads to make a noise, since most people will have a noise checked out.
  27. 27. Just a couple more things…
  28. 28. Diagnosis Several different types of Complaints Noise Pulsation Pedal travel More later…
  29. 29. Brake Noise Wear Indicator
  30. 30. Brake Pulsation Usually a warped Rotor Rotor needs trued on a brake lathe
  31. 31. Replacement http://www.youtube.com/watch?v=bMYbJ-G0gaU&feature=fvst Disc Brake Pads and Rotors

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