The slide shows the classification of Continuous Service Brakes.
Continuous Service Brakes
The effectiveness of wheel brakes is prescribed by law. When friction brakes are applied continuously in association with high braking loads, it can lead to brakes overheating, which in turn results in a sharp decrease in the brake effect (fading). For heavy commercial vehicles therefore continuous largely friction-free service brakes independent of the wheel brakes are prescribed by law.
Generally three different continuous service brake types are employed:
Engine brake,
Hydrodynamic retarder,
Electric retarder.