brake system fundamentals.ppt
DESCRIPTION
brakeTRANSCRIPT
![Page 1: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/1.jpg)
Brake System Fundamentals
Walla Walla Community College
Automotive Technology
![Page 2: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/2.jpg)
Typical System (No ABS)
![Page 3: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/3.jpg)
Typical Layout of System(with ABS)
![Page 4: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/4.jpg)
Brake Pedal DesignAdvantage by Leverage First Mechanical
Advantage is Driver’s foot
Length of Lever determines force applied
Uses Fulcrum Pedal Ratio
10
25:1 2.5 inches
50.5 inch
![Page 5: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/5.jpg)
Advantage by Hydraulics
![Page 6: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/6.jpg)
ComponentsComponents
![Page 7: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/7.jpg)
Drum Brake System
![Page 8: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/8.jpg)
Disc Brake Caliper Assembly
![Page 9: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/9.jpg)
Sliding Caliper
Applies pressure to two pads on opposite sides of rotor
Caliper Sliding Fixed
Friction Material exposed to air
![Page 10: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/10.jpg)
Fixed Caliper
Applies two pistons to opposite sides of rotor
Caliper stays stationary
Disc Brakes require higher hydraulic pressure
![Page 11: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/11.jpg)
Master Cylinder
![Page 12: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/12.jpg)
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
![Page 13: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/13.jpg)
Pressure Control Valves
All systems use one or more valves
![Page 14: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/14.jpg)
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
![Page 15: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/15.jpg)
Power AssistIncreases force of driver’s foot
![Page 16: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/16.jpg)
Cable Parking Brake
Parking or “Emergency” Brake
![Page 17: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/17.jpg)
Parking Brake Systems
Foot or Hand Brake Are cable controlled
Several Styles As shown Drum in hat Driveline
![Page 18: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/18.jpg)
Brake System EnergyBrake System Energy
![Page 19: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/19.jpg)
Brake System Principles
Kinetic Energy Mass Weight Speed Inertia and
Momentum
![Page 20: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/20.jpg)
Friction Principles
Kinetic and Static Friction
Friction and Pressure
Friction and Surface Area
Coefficient of Friction
Brake Fade
![Page 21: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/21.jpg)
Brake Friction Materials
Five Characteristics Resist Fading with
increased temp Resist fading when
wet Recover quickly Wear gradually Quiet
Bonded or Riveted
![Page 22: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/22.jpg)
Braking Dynamics
Weight Transfer Weight Distribution Braking Power Friction Efficiency
Brake to Wheel Wheel to Road
Surface Traction Efficiency
Skidding
![Page 23: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/23.jpg)
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
AreaPressure
![Page 24: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/24.jpg)
The area of the piston is
determined by using the
formula:
3.14 X R2
![Page 25: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/25.jpg)
The amount force is
calculated by multiplying
the pressure times the area
P X A = Force
![Page 26: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/26.jpg)
Hydraulics - it’s how the pressure is multiplied and transferred
![Page 27: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/27.jpg)
Hydraulic pressure is distributed equally in all directions
![Page 28: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/28.jpg)
The pressure that is applied at piston A is the same as what is applied to piston B
![Page 29: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/29.jpg)
The hydraulic pressure is the same, The hydraulic pressure is the same, but the applied force can be changed but the applied force can be changed by changing the piston size.by changing the piston size.
![Page 30: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/30.jpg)
You can’t have something for nothing
![Page 31: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/31.jpg)
The caliper piston needs more applied The caliper piston needs more applied force for multiple reasonsforce for multiple reasons
![Page 32: Brake System Fundamentals.ppt](https://reader033.vdocuments.site/reader033/viewer/2022061612/55cf9deb550346d033afda8b/html5/thumbnails/32.jpg)