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Brake System Fundamentals

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Title: Brake System Fundamentals Author: Jim Haun Last modified by: charles wilson Created Date: 3/20/2001 7:51:18 PM Document presentation format – PowerPoint PPT presentation

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Title: Brake System Fundamentals


1
Brake System Fundamentals
  • Walla Walla Community College
  • Automotive Technology

2
Typical System (No ABS)
3
Typical Layout of System (with ABS)
4
Brake Pedal Design Advantage by Leverage
  • First Mechanical Advantage is Drivers foot
  • Length of Lever determines force applied
  • Uses Fulcrum
  • Pedal Ratio

10
51
2.5 inches
0.5 inch
2
5
5
Advantage by Hydraulics
6
Components
7
Drum Brake System
8
Disc Brake Caliper Assembly
9
Sliding Caliper
  • Applies pressure to two pads on opposite sides of
    rotor
  • Caliper
  • Sliding
  • Fixed
  • Friction Material exposed to air

10
Fixed Caliper
  • Applies two pistons to opposite sides of rotor
  • Caliper stays stationary
  • Disc Brakes require higher hydraulic pressure

11
Master Cylinder
12
Brake Plumbing
  • Rigid steel brake lines are double wall
  • Flexible hoses connect rigid lines on vehicle to
    each wheel
  • Transmits hydraulic fluid to each wheel

13
Pressure Control Valves
All systems use one or more valves
14
Wheel Cylinder
  • Wheel cylinder or caliper pistons are slave
    cylinders
  • Change hydraulic pressure back into mechanical
    force
  • Can use one or two cylinders at each wheel

15
Power Assist Increases force of drivers foot
16
Cable Parking Brake
Parking or Emergency Brake
17
Parking Brake Systems
  • Foot or Hand Brake
  • Are cable controlled
  • Several Styles
  • As shown
  • Drum in hat
  • Driveline

18
Brake System Energy
19
Brake System Principles
  • Kinetic Energy
  • Mass
  • Weight
  • Speed
  • Inertia and Momentum

20
Friction Principles
  • Kinetic and Static Friction
  • Friction and Pressure
  • Friction and Surface Area
  • Coefficient of Friction
  • Brake Fade

Friction changes kinetic energy into heat
(thermal) energy.
21
Brake Friction Materials
  • Five Characteristics
  • Resist Fading with increased temp
  • Resist fading when wet
  • Recover quickly
  • Wear gradually
  • Quiet

Bonded or Riveted
22
Braking Dynamics
  • Weight Transfer
  • Weight Distribution
  • Braking Power
  • Friction Efficiency
  • Brake to Wheel
  • Wheel to Road Surface
  • Traction Efficiency
  • Skidding

23
Hydraulic Principles
  • Fluids cannot be compressed
  • Fluids can transmit Movement
  • Acts Like a steel rod in a closed container
  • Master cylinder transmits fluid to wheel cylinder
    or caliper piston bore.
  • Fluids can transmit and increase force
  • Force

Pressure
Area
24
The area of the piston is determined by using the
formula
  • 3.14 X R2

25
The amount force is calculated by multiplying the
pressure times the area
  • P X A Force

26
Hydraulics - its how the pressure is multiplied
and transferred
27
Hydraulic pressure is distributed equally in all
directions
28
The pressure that is applied at piston A is the
same as what is applied to piston B
29
The hydraulic pressure is the same, but the
applied force can be changed by changing the
piston size.
30
You cant have something for nothing
31
The caliper piston needs more applied force for
multiple reasons

32
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