Slide 1
Friction braking turns motion into heat
Friction brakes turn much of a moving vehicle’s kinetic energy into thermal energy. The brakes must absorb and release that heat while producing the required force.
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For the same mass, doubling speed multiplies translational kinetic energy by four. A modest increase in speed can therefore create a much larger thermal task during a stop.
Slide 2
The disc briefly stores much of that incoming energy
During a short stop, brake components heat up faster than they can lose all the incoming energy. Their thermal capacity limits the temperature rise.
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Repeated stops leave less time for cooling between events. A brake that handles one isolated stop may behave differently during sustained descending or repeated heavy braking.
Slide 3
Airflow and surface area remove heat
Airflow and exposed surface area help a brake reject heat. Ventilated discs provide internal passages that improve exchange with the surrounding air.
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Cooling routes affect drag, packaging and the temperatures of nearby components. More cooling is not free, so designers match it to the expected service rather than maximizing airflow everywhere.
Slide 4
Overheating can weaken friction and pressure transmission
Excessive heat can reduce the effectiveness of friction materials. Heat reaching hydraulic fluid can also create vapor and disturb pressure transmission.
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These are different failure mechanisms, even though both can reduce braking performance. Diagnosis needs to distinguish friction fade from fluid boiling rather than treating every hot-brake symptom alike.
Slide 5
Regeneration reduces heat, but friction brakes remain necessary
Regenerative braking can convert some vehicle energy into stored electrical energy. Friction brakes still cover conditions where recovery is limited or unavailable.
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Battery charge level, temperature and power limits can restrict energy acceptance. The mechanical braking system must therefore remain capable when the electrical path cannot take the full load.