AIAG-VDA FMEA Process
Function Analysis
Step 3 of 7 - AIAG-VDA FMEA
Brake System FMEA - Master Cylinder Assembly
In ProgressProject ID
FMEA-BRK-2025-073
Project Owner
JD
John Doe
Last Updated
July 4, 2025
Progress:
42%
Function Hierarchy
Primary
Secondary
Tertiary
Function
Type
Status
Actions
F1: Convert driver input to hydraulic pressure
Converts mechanical force to hydraulic pressure
Primary
Completed
F1.1: Amplify driver pedal force
Increases force applied to master cylinder
Secondary
Completed
F1.1.1: Provide mechanical advantage
Leverage ratio of 5:1
Tertiary
Completed
F1.2: Generate hydraulic pressure
Convert mechanical force to fluid pressure
Secondary
In Progress
F2: Distribute hydraulic pressure to wheel cylinders
Routes pressure to front and rear brake circuits
Primary
Not Started
F3: Maintain fluid reservoir
Store and supply brake fluid
Primary
Not Started
F4: Provide fail-safe operation
Ensure partial braking in case of circuit failure
Primary
Not Started
Showing 7 functions
Function-Component Matrix
| Function / Component | Master Cylinder Body | Primary Piston | Secondary Piston | Reservoir | Seals | Push Rod |
|---|---|---|---|---|---|---|
| F1: Convert driver input to hydraulic pressure |
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| F2: Distribute hydraulic pressure to wheel cylinders |
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| F3: Maintain fluid reservoir |
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| F4: Provide fail-safe operation |
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Strong Relationship
Weak Relationship
Function Properties
Selected Function
F1.2: Generate hydraulic pressure
Convert mechanical force to fluid pressure
Function Parameters
Associated Components
Function Analysis Guide
Function Analysis is Step 3 of the AIAG-VDA FMEA process. This step focuses on identifying and analyzing the functions of the system, subsystem, and components.
- Define system functions and requirements
- Create function tree with hierarchical structure
- Map functions to components
- Analyze interfaces between functions
- Define function parameters and acceptance criteria