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


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

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.

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

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

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

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.

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

9 Rotors

10 Performance Rotors

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

12 Caliper*

13 Disc Brake Pads Asbestos Metallic Semi-Metallic Organic

14 Wheel Assembly

15 Disc Brake Assembly

16 Drum Brakes

17 Drum Brakes

18 Drum Brake Action Adjust by driving in reverse and braking

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

20 Two Types of Drum Brakes

21 Two Types of Drum Brakes

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

23 Brake Light Hydraulic system fails Parking brake is on

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.

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.

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

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

28 Reservoirs

29 Reservoir Problems

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

31 Booster Operation

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

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.

34 Brake Parts

35 Hydraulic Valves

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

37 Basics of Hydraulics

38 Hydraulic Action in the Wheel Cylinder

39 Braking Videos

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

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.

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

43 Brake Fluid DOT 3 DOT4 DOT5 Silicone

44 Brake Service Visual Inspection Measure Resurface Repair Recondition
Bleed Test

45 Problems

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

47 ABS 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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