This module uses simplified friction/torque, clearance and release relationships with fictional teaching values. It does not provide OEM rotor/drum limits, parking-brake adjustment specifications, machining limits or authorization to service a real brake system. Brake work is safety-critical: use exact service information, approved lifting/support and PPE, correct friction-material/contamination procedures, wheel-fastener procedures and a controlled final verification.
Turn wheel-end hardware into measurable brake evidence
13.2 traced hydraulic apply/release to the wheel end. This module compares disc, drum and mechanical parking-brake hardware, measurement and complaint patterns. Next planned module: 13.4 · Power Assist & Brake Boosting.
Compare the components that create, control and release friction torque
Change force, friction, radius, clearance and drag—and watch the mechanical relationship change
This is a simplified comparison model. The displayed torque/response values are teaching relationships only, not actual vehicle specifications or parking-grade guarantees.
*Fictional teaching values. Torque is a simplified relative relationship using apply force × friction × effective radius, with a drum-only self-energizing multiplier. Clearance and drag use normalized response penalties and are not service specifications.
Separate friction-surface, movement, adjustment and release faults
Ordered disc/drum/parking diagnostic workflow
Complete the sequence in order.
Evidence
Best supported conclusion / next step
10-question knowledge check
Online friction-brake reasoning is not hands-on brake-service competency
Use approved trainers/vehicles and exact service information. Observe safe component identification, measurement, inspection, parking-brake force-path reasoning and final verification.
Student: ____________________ Date: __________ Instructor: ____________________