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You’re driving your car downhill and you want to stop it, the speed’s 100km/h, you release the gas. BUT! THECARDOESN’TEVENSLO WDOWNWHATCANYOUDO YOU’REGONNADIE!

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Presentation on theme: "You’re driving your car downhill and you want to stop it, the speed’s 100km/h, you release the gas. BUT! THECARDOESN’TEVENSLO WDOWNWHATCANYOUDO YOU’REGONNADIE!"— Presentation transcript:

1 You’re driving your car downhill and you want to stop it, the speed’s 100km/h, you release the gas. BUT! THECARDOESN’TEVENSLO WDOWNWHATCANYOUDO YOU’REGONNADIE! =>=>=> I bet you want to avoid it, but what can you do? Let me tell you! YOU NEED: => With brakes, you’re a winner. =>

2 There are many kinds of brakes like: disk brakes, air brakes, or the handbrake any many more. Brakes can work mechanically, hydraulically, pneumatically or electromagnetically. The actual slowing down and stopping happens because of friction.

3 Hydraulic disk brake 1: pedal 2: piston 3: master cylinder 4: hydraulic line 5: brake cylinder 6: brake piston 7: brake band 8: wheel 9: return spring

4 How does the brake work then? In the previous model, the foot pressing the pedal is working as a pump giving the liquid it’s pressure. When the pedal is pressed, the piston then presses the liquid into the hydraulic lines. When liquid arrives at the brake’s cylinders, the pressure moves the brake’s band to contact the wheel. Friction then causes the wheel to slow down and eventually stop. As you couldn’t see it in the previous model there’s usually a (steel) disk which is contact with the brake. When the disk slows down, so does the shaft and of course the wheels too.

5 You didn’t read it didn’t you? Here’s a chance to prove you did! 1. What color were the ’Basic info’ letters presented in? 2. How many wheels there were in the model? 3. How many different ways can brakes work (the ones presented) 4. Why do things slow down? 5. Disk brake’s disk is usually made of…? Info is from wikipedia and www.maritime.org. Pictures are from Google.www.maritime.org Copyright Elmo Pikkupeura 2007 ©


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