This module uses simplified fictional force, supply and pressure relationships. It does not provide OEM vacuum specifications, hydraulic-assist pressures, electric-booster calibrations, pushrod adjustments or authorization to road-test a vehicle with suspected assist loss. Brake work is safety-critical: use exact service information, approved support/PPE, architecture-specific depressurization procedures, and controlled final verification.
Multiply pedal force without losing the diagnostic trail
13.3 compared the wheel-end friction mechanisms. This module moves upstream to the force-assist layer between the driver and master cylinder. Next planned module: 13.5 · ABS, Stability Control & Traction Control.
Compare the components that turn driver effort into assisted master-cylinder force
Change pedal force, leverage, supply and assist gain—and watch the master-cylinder input change
This is a simplified teaching model. Vacuum, hydraulic and electric boosters do not share one real-world linear gain equation; values below are fictional relationships used to visualize force multiplication and supply loss.
*Fictional teaching values. The model uses driver force × pedal ratio plus a normalized assist term. It is not a booster sizing formula, vacuum specification, hydraulic pressure specification or electric-booster calibration method.
Separate energy-source, assist-device, linkage and downstream hydraulic faults
Ordered brake-assist diagnostic workflow
Complete the sequence in order.
Evidence
Best supported conclusion / next step
10-question knowledge check
Online brake-assist reasoning is not hands-on brake-service competency
Use approved trainers/vehicles and exact service information. Observe safe architecture identification, source testing, command/response reasoning, fail-safe awareness and final verification.
Student: ____________________ Date: __________ Instructor: ____________________