AUTOMOTIVE BRAKING SYSTE

1
How it Works
Friction

develops heat which
absorbs kinetic energy of the
car

2
PURPOSE OF BRAKING
SYSTEM
 Stop

the vehicle by converting the kinetic energy of
the vehicle to heat energy.
 Heat energ...
Factors Effecting Braking*
 Number

of wheels braking.
 Weight of vehicle.
 Type of friction material.
 Surface area o...
Types of Braking Systems
 Service

brakes. It’s
the primary braking
system using a the
pedal connected to a
hydraulic sys...



BASIC PARTS






Pedal assembly
Hydraulic system
Power booster
Disc brake
assembly
Drum brake
assembly

6
DISC BRAKES

 Disc

brakes use a
rotating disc with
two stationary
friction pads that are
pressed against to
rotor by the...
Rotor
Pads
Caliper
Piston
Brake
Line
Bleeder
screw
Through
Bolts

Disc Brake Rotor

8
Rotors

9
Performance Rotors

10
 Boot

Caliper

 Piston
 Seal
 Caliper

Housing
 Bleed Screw
 O-Ring
 Bushing
 Bolts
11
Caliper*

12
Disc Brake Pads
 Asbestos
 Metallic
 Semi-Metallic
 Organic

13
Wheel Assembly

14
Disc Brake Assembly

15
Drum Brakes

16
Drum Brakes

17
Drum Brake Action
Adjust by driving in reverse and braking

18
DRUM BRAKES
 Wheel

Cylinder

 Piston
 Upper

 Anchor

Pin

 .Backing

Plate
 Parking Brake
Lever

Return

Spring
 ...
Two Types of Drum Brakes

20
Two Types of Drum Brakes

21
HYDRAULIC SYSTEM










Brake pedal assembly
Power booster
Master cylinder
Proportioning valve
Metering valve
...
 Hydraulic

system

Brake Light

fails
 Parking brake is on

23
Master Cylinder
The master cylinder displaces brake fluid under
pressure to brake system.
 When brake pedal is depressed,...
MASTER CYLINDER
 pedal

retracts, the pistons allow fluid from
the reservoir to fill the chamber
 Special sensors within...
Master Cylinder
 If

a brake fluid leak occurs in one system,
the other system will still operate, making it
possible to....
Master Cylinder
Reservoirs

Master
Cylinder
To
Front
Brakes

To Rear
Brakes

Vacuum Line
Power
Booster

Brake Pedal

27
Reservoirs

28
Reservoir Problems

29
Power Brake Booster
Gain power from vacuum in intake manifold

30
Booster
Operation

31
Brake Lines


Brake lines are stee
tubing with copper
and lead coatings to
prevent rust and
corrosion. As the
brake pedal...
Brake Lines








Throughout the brake
system and into the wheel
(or brake) cylinders.
The pressure placed
upon this...
Brake Parts

34
Hydraulic Valves

35
Hydraulic Action in the Caliper
 Squeeze

Rotor
 Push out on Drum

36
Basics of Hydraulics

37
Hydraulic Action in the Wheel
Cylinder

38
Braking Videos

http://www.raybestos.com/main.htm?techcenter.htm

39
PARKING BRAKE
 Parking

brake pedal or

lever
 Cables
 Adjuster
 Drum brake linkage
 Disc brake lever

40
BRAKE INSPECTION
 Remove

all four wheels of the vehicle.
 On drum brakes remove the drums and
wash brake dust with prop...
Brake Fluid
 Litmus

test

 Color
 Non

compressible
 Resists boiling
 High &low
temperature stability
 Non-corrosiv...
Brake Fluid
 DOT

3
 DOT4
 DOT5
– Silicone

43
Brake Service
 Visual

Inspection
 Measure
 Resurface
 Repair
 Recondition
 Bleed
 Test

44
Problems

45
ABS
 Modulator
 VSS/
 Vehicle

speed
sensors
 Electronic
Brake
Control Unit
46
ABS
 Wheel

locks upreduces power to that
wheel
 Pulsates brakes if
sliding
 Pulsates brakes on hard
braking
 Stops ve...
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  • Brakes

    1. 1. AUTOMOTIVE BRAKING SYSTE 1
    2. 2. How it Works Friction develops heat which absorbs kinetic energy of the car 2
    3. 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 nonmoving surface at each wheel to generate the heat.  Disc and drum brakes are the most common type of braking systems used. 3
    4. 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 4
    5. 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. 5
    6. 6.   BASIC PARTS     Pedal assembly Hydraulic system Power booster Disc brake assembly Drum brake assembly 6
    7. 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. 7
    8. 8. Rotor Pads Caliper Piston Brake Line Bleeder screw Through Bolts Disc Brake Rotor 8
    9. 9. Rotors 9
    10. 10. Performance Rotors 10
    11. 11.  Boot Caliper  Piston  Seal  Caliper Housing  Bleed Screw  O-Ring  Bushing  Bolts 11
    12. 12. Caliper* 12
    13. 13. Disc Brake Pads  Asbestos  Metallic  Semi-Metallic  Organic 13
    14. 14. Wheel Assembly 14
    15. 15. Disc Brake Assembly 15
    16. 16. Drum Brakes 16
    17. 17. Drum Brakes 17
    18. 18. Drum Brake Action Adjust by driving in reverse and braking 18
    19. 19. DRUM BRAKES  Wheel Cylinder  Piston  Upper  Anchor Pin  .Backing Plate  Parking Brake Lever Return Spring  Primary Brake Shoe  .Secondary Brake Shoe  Adjuster  .Lower Spring Return 19
    20. 20. Two Types of Drum Brakes 20
    21. 21. Two Types of Drum Brakes 21
    22. 22. HYDRAULIC SYSTEM          Brake pedal assembly Power booster Master cylinder Proportioning valve Metering valve Warning light valve Lines Calipers Wheel cylinders 22
    23. 23.  Hydraulic system Brake Light fails  Parking brake is on 23
    24. 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.  24
    25. 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. 25
    26. 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 26
    27. 27. Master Cylinder Reservoirs Master Cylinder To Front Brakes To Rear Brakes Vacuum Line Power Booster Brake Pedal 27
    28. 28. Reservoirs 28
    29. 29. Reservoir Problems 29
    30. 30. Power Brake Booster Gain power from vacuum in intake manifold 30
    31. 31. Booster Operation 31
    32. 32. Brake Lines  Brake lines are stee 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 32
    33. 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. 33
    34. 34. Brake Parts 34
    35. 35. Hydraulic Valves 35
    36. 36. Hydraulic Action in the Caliper  Squeeze Rotor  Push out on Drum 36
    37. 37. Basics of Hydraulics 37
    38. 38. Hydraulic Action in the Wheel Cylinder 38
    39. 39. Braking Videos http://www.raybestos.com/main.htm?techcenter.htm 39
    40. 40. PARKING BRAKE  Parking brake pedal or lever  Cables  Adjuster  Drum brake linkage  Disc brake lever 40
    41. 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. 41
    42. 42. Brake Fluid  Litmus test  Color  Non compressible  Resists boiling  High &low temperature stability  Non-corrosive to rubber parts  Hydroscopic – Absorbs water 42
    43. 43. Brake Fluid  DOT 3  DOT4  DOT5 – Silicone 43
    44. 44. Brake Service  Visual Inspection  Measure  Resurface  Repair  Recondition  Bleed  Test 44
    45. 45. Problems 45
    46. 46. ABS  Modulator  VSS/  Vehicle speed sensors  Electronic Brake Control Unit 46
    47. 47. ABS  Wheel locks upreduces power to that wheel  Pulsates brakes if sliding  Pulsates brakes on hard braking  Stops vehicle under control  NOT faster 47
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