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Presentation on theme: "1 AUTOMOTIVE BRAKING SYSTEMS AUTOMOTIVE BRAKING SYSTEMS."— Presentation transcript:



3 2 How it Works Friction develops heat which absorbs kinetic energy of the car

4 3 PURPOSE OF BRAKING SYSTEM Stop the vehicle by converting the kinetic energy of the vehicle to heat energy. Heat energy is created in the brakes by friction. Friction is created between a moving and a non- moving surface at each wheel to generate the heat. Disc and drum brakes are the most common type of braking systems used.

5 4 Factors Effecting Braking* Number of wheels braking. Weight of vehicle. Type of friction material. Surface area of friction material. Size or discs or drums Tire traction. Road surface. Load transfer. Incline or decline of road. (gravity) Engine braking. Pressure applied

6 5 Types of Braking Systems Service brakes. Its the primary braking system using a the pedal connected to a hydraulic system causing it to operate. Parking brakes. Its mechanically applied by a lever or pedal.

7 6 BASIC PARTS Pedal assembly Hydraulic system Power booster Disc brake assembly Drum brake assembly Parking brake

8 7 DISC BRAKES Disc brakes use a rotating disc with two stationary friction pads that are pressed against to rotor by the caliper to create friction and heat. Disc brakes are more effective at dissipating heat.

9 8 Disc Brake Rotor Rotor Pads Caliper Piston Brake Line Bleeder screw Through Bolts Rotor Pads Caliper Piston Brake Line Bleeder screw Through Bolts

10 9Rotors

11 10 Performance Rotors

12 11 Caliper Boot Piston Seal Caliper Housing Bleed Screw O-Ring Bushing Bolts

13 12 Caliper*

14 13 Disc Brake Pads Asbestos Metallic Semi-Metallic Organic

15 14 Wheel Assembly

16 15 Disc Brake Assembly

17 16 Drum Brakes

18 17 Drum Brakes

19 18 Drum Brake Action Adjust by driving in reverse and braking

20 19 DRUM BRAKES Wheel Cylinder.Backing Plate.Secondary Brake Shoe Upper Return Spring Parking Brake Lever Primary Brake Shoe Piston Adjuster Anchor Pin.Lower Return Spring

21 20 Two Types of Drum Brakes

22 21 Two Types of Drum Brakes

23 22 HYDRAULIC SYSTEM Brake pedal assembly Power booster Master cylinder Proportioning valve Metering valve Warning light valve Lines Calipers Wheel cylinders

24 23 Brake Light Hydraulic system fails Parking brake is on

25 24 Master Cylinder The master cylinder displaces brake fluid under pressure to brake system. When brake pedal is depressed, push rod moves the primary piston forward in the cylinder. Hydraulic pressure created and the force of the primary piston spring moves the secondary piston forward. forward movement of the pistons causes primary cups to cover bypass holes, hydraulic pressure builds up and is transmitted to the wheel cylinders.

26 25 MASTER CYLINDER pedal retracts, the pistons allow fluid from the reservoir to fill the chamber Special sensors within the master cylinder used to monitor level of fluid in reservoir, and alerts driver if pressure imbalance develops. standard dual master cylinder gives front and rear brakes separate hydraulic systems.

27 26 Master Cylinder If a brake fluid leak occurs in one system, the other system will still operate, making it possible to... STOP THE CAR

28 27 Master Cylinder To Front Brakes To Rear Brakes Master Cylinder Reservoirs Power Booster Vacuum Line Brake Pedal

29 28 Reservoirs

30 29 Reservoir Problems

31 30 Power Brake Booster Gain power from vacuum in intake manifold

32 31 Booster Operation

33 32 Brake Lines Brake lines are steel tubing with copper and lead coatings to prevent rust and corrosion. As the brake pedal is depressed, it moves pistons within the master cylinder and forcing hydraulic brake fluid

34 33 Brake Lines Throughout the brake system and into the wheel (or brake) cylinders. The pressure placed upon this fluid causes the cylinder pistons to move, forcing the brake shoes or friction pads and brake drums or rotors to slow the vehicle.

35 34 Brake Parts

36 35 Hydraulic Valves

37 36 Hydraulic Action in the Caliper Squeeze Rotor Push out on Drum

38 37 Basics of Hydraulics

39 38 Hydraulic Action in the Wheel Cylinder

40 39 Braking Videos

41 40 PARKING BRAKE Parking brake pedal or lever Cables Adjuster Drum brake linkage Disc brake lever

42 41 BRAKE INSPECTION Remove all four wheels of the vehicle. On drum brakes remove the drums and wash brake dust with proper cleaner. Check brake pads and brakes shoes for wear. Check drums and rotors for wear and damage.

43 42 Brake Fluid Litmus test Color Non compressible Resists boiling High &low temperature stability Non-corrosive to rubber parts Hydroscopic – Absorbs water

44 43 Brake Fluid DOT 3 DOT4 DOT5 – Silicone

45 44 Brake Service Visual Inspection Measure Resurface Repair Recondition Bleed Test

46 45Problems

47 46ABS Modulator VSS/ Vehicle speed sensors Electronic Brake Control Unit

48 47ABS Wheel locks up- reduces power to that wheel Pulsates brakes if sliding Pulsates brakes on hard braking Stops vehicle under control NOT faster


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