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1、The Brake System 制动系统Unit 6Passage APassage Al The most important system in your car. The most important system in your car.l If the brakes dont work properly, the result can be If the brakes dont work properly, the result can be disastrous.disastrous.l Good brakes are essential for safety. Good bra
2、kes are essential for safety.Passage APassage ABrake system () Passage APassage ABrake system ()Passage APassage ATwo completely independent braking system1.Service brakeService brake Main braking system used to slow down or stop the Main braking system used to slow down or stop the car during norma
3、l driving.car during normal driving. Foot-operated by the driver depressing and Foot-operated by the driver depressing and releasing the brake pedal.releasing the brake pedal.2.Parking brake Parking brake ( (Hand brake)Hand brake) Hold a car stationary while it is Hold a car stationary while it is u
4、nattendedunattended, and to , and to keep the car from rolling on keep the car from rolling on unleveledunleveled ground. ground.Passage APassage ABrake system ()Passage APassage ABasically, all car brakes are friction brakes. When the Basically, all car brakes are friction brakes. When the driver a
5、pplies the brake, the control device forces driver applies the brake, the control device forces brake shoes / pads brake shoes / pads against the against the rotating drums / rotating drums / disksdisks at wheel. at wheel.Friction between the shoes / pads and the drums / Friction between the shoes /
6、 pads and the drums / disks then slows / stops the wheels so that the car is disks then slows / stops the wheels so that the car is braked.braked.Passage APassage ABrake system ()Passage APassage ADisk brake1.Used for years for front wheel applications, are fast Used for years for front wheel applic
7、ations, are fast replacing drum brakes on the rear wheels of modern replacing drum brakes on the rear wheels of modern cars, due to their cars, due to their simpler designsimpler design, , lighter weight lighter weight and and better braking performancebetter braking performance. .2.Provides signifi
8、cantly better resistance to Provides significantly better resistance to brake brake fadefade compared with drum type braking system. compared with drum type braking system.3. Main components: Main components: Brake padsBrake pads, , CaliperCaliper, , Disk / Disk / RotorRotorPassage APassage ABrake s
9、ystem ()Passage APassage ABrake padhttp:/ lining With lining rivetedriveted or or bondedbonded to it. to it.2.Mounted in the caliper, one on each side of rotor.Mounted in the caliper, one on each side of rotor.3.Asbestos are primarily used because of its heat Asbestos are primarily used because of i
10、ts heat absorbing properties and quiet operation.absorbing properties and quiet operation.Passage APassage ABrake system ()Passage APassage ACaliper1.Floating calipers and fixed calipersFloating calipers and fixed calipershttp:/ APassage ABrake system ()Passage APassage ACaliperHow does a floating c
11、aliper work?How does a floating caliper work?l lFloats or moves in a track in its support so that it can Floats or moves in a track in its support so that it can center itself over the motor.center itself over the motor.l lThe hydraulic fluid pushes in two direction. Firstly, it The hydraulic fluid
12、pushes in two direction. Firstly, it forces the piston against the inner pad which in turn forces the piston against the inner pad which in turn pushes against the rotor. Secondly, it also pushes the pushes against the rotor. Secondly, it also pushes the caliper in the opposite direction against the
13、 outer pad caliper in the opposite direction against the outer pad which pushes the other side of the rotor.which pushes the other side of the rotor.Passage APassage ABrake system ()Passage APassage ACaliperl Single piston calipers are the most popular and Single piston calipers are the most popular
14、 and also least costly to manufacture and service.also least costly to manufacture and service.l Floating calipers are also available on some Floating calipers are also available on some vehicles with two pistons mounted on the same vehicles with two pistons mounted on the same side.side.http:/ an i
15、mproved Provides an improved braking feel, found on braking feel, found on more expensive carsmore expensive carsPassage APassage ABrake system ()Passage APassage ACaliperlFixed calipers are mounted rigidity to support Fixed calipers are mounted rigidity to support and are not allowed to move.and ar
16、e not allowed to move.http:/ brake feel and more Better brake feel and more efficient, while more efficient, while more expensive to produce and expensive to produce and cost more to service.cost more to service.8-piston High Performance Brake System from AC Schnitzer Passage APassage ABrake system
17、()Passage APassage ADisk rotorlBe made of iron with highly machined surfaces Be made of iron with highly machined surfaces where the brake pads contact it.where the brake pads contact it.lJust as the brake pads wear out over time, the rotor Just as the brake pads wear out over time, the rotor also u
18、ndergoes some wear, usually also undergoes some wear, usually in the form of in the form of ridgesridges and and groovesgrooves where the brake pad rubs where the brake pad rubs against it.against it.http:/ APassage ANew words （生词）22.22. Disastrous Disastrous23.23. Foot-operate Foot-operate24.24. Un
19、attended Unattended25.25. Unleveled Unleveled26.26. Significantly Significantly27.27. Caliper Caliper28.28. Squeeze Squeeze29.29. Lining Lining30.30. Bonded Bonded31.31. Outlaw Outlaw32.32. Configuration Configuration33.33. Groove Groove34.34. Service brake Service brake35.35. Parking brake Parking
20、brake36.36. Brake shoes Brake shoes37.37. Brake pads Brake pads38.38. Disk brake Disk brake39.39. Drum brake Drum brake40.40. Wear out Wear out41.41. Be made of Be made ofPassage BPassage BBrake system ()lWhy do we still have cars with drum brakes?Why do we still have cars with drum brakes?lLow cost
21、Low costDrum brakehttp:/www.carbasics.co.uk/what_are_drum_brakes.htmlConsists: Consists: Backing plateBacking plate, , brake shoesbrake shoes, , brake drumbrake drum, , return spring return spring and and an an automatic or self adjusting automatic or self adjusting systemsystemPassage BPassage BBra
22、ke system ()lTypical brake system components:Typical brake system components:1.Master cylinderMaster cylinder2.Brake lines and brake hosesBrake lines and brake hoses3.Brake fluidBrake fluid4.Shoes and padsShoes and padsBrake systemPassage BPassage BBrake system ()lLocated in engine Located in engine
23、 compartmentcompartment on the firewall, on the firewall, directly in front of the drivers seat.directly in front of the drivers seat.lTwo completely separate master cylinder, each Two completely separate master cylinder, each handling two wheels.handling two wheels.Master cylinderhttp:/ one side fa
24、ils, you will still If one side fails, you will still be able to stop the car.be able to stop the car.lThe most common problem The most common problem is an internal leak.is an internal leak.Passage BPassage BBrake system ()lThe brake fluid travels from the master cylinder to The brake fluid travels
25、 from the master cylinder to the wheel brake through a series of the wheel brake through a series of steel tubes steel tubes and and reinforced rubber hosesreinforced rubber hoses. .lRubber hoses are only used in places that require Rubber hoses are only used in places that require flexibility, such
26、 as front wheel.flexibility, such as front wheel.lNon-corrosive Non-corrosive seamless steel seamless steel tubing with special tubing with special fitting is used in all rest attachment points.fitting is used in all rest attachment points.lReplace the complete line if needed, and do not Replace the
27、 complete line if needed, and do not use the brass compression fittings or copper tubing.use the brass compression fittings or copper tubing.Brake lines and brake hoses:Passage BPassage BBrake system ()lA special oil that has special properties.A special oil that has special properties.lWithstand co
28、ld Temp. without thickening as well as Withstand cold Temp. without thickening as well as very high Temp. without boiling.very high Temp. without boiling.lTransparent reservoir is used to easily check the Transparent reservoir is used to easily check the fluid level. Slightly decreasing of the level
29、 is a fluid level. Slightly decreasing of the level is a normal condition as the brake pads wear. normal condition as the brake pads wear. lNever let the level goes down to below the Never let the level goes down to below the two two thirds fullthirds full. And keep the reservoir covered except . An
30、d keep the reservoir covered except for the time you need to fill it.for the time you need to fill it.Brake fluidPassage BPassage BBrake system ()lAmplify the available foot pressure applied to the Amplify the available foot pressure applied to the brake pedal.brake pedal.lPower for the booster come
31、s from engine vacuum.Power for the booster comes from engine vacuum.lVacuum enters the booster through a Vacuum enters the booster through a check valvecheck valve, , which is connected to the engine with a rubber which is connected to the engine with a rubber hose and acts as a one-way valve that a
32、llows the hose and acts as a one-way valve that allows the vacuum to enter the booster but does not let it vacuum to enter the booster but does not let it escape.escape.BoosterPassage APassage ANew words （生词）1.1. Compartment Compartment2.2. Firewall Firewall3.3. Power-assisted Power-assisted4.4. Ale
33、rt Alert5.5. Rarely Rarely6.6. Malfunction Malfunction7.7. Reinforce Reinforce8.8. Non-corrosive Non-corrosive9.9. Seamless Seamless10.10. Fitting Fitting11.11. Illegal Illegal12.12. Spongy Spongy13.13. Transparent Transparent14.14. By-product By-product15.15. Be composed of Be composed of16.16. Hyd
34、raulic pressure Hydraulic pressure17.17. Amplify Amplify18.18. Engine compartment Engine compartment19.19. Power brake booster Power brake booster20.20. Brake warning light Brake warning light21.21. Two thirds full Two thirds full西华大学XIHUA UNIVERSITYXIHUA UNIVERSITY交通与汽车工程学院交通与汽车工程学院Faculty of Facul
35、ty of Transportation and Transportation and Automotive EngineeringAutomotive Engineering Homework1.Review the new words and expressions2.Exercise 3,5,6西华大学XIHUA UNIVERSITYXIHUA UNIVERSITY交通与汽车工程学院交通与汽车工程学院Faculty of Faculty of Transportation and Transportation and Automotive EngineeringAutomotive Engineering Thanks
