In a spring brake chamber, what are the two main sections and their roles?

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1. A service brake section using air pressure to apply the brake, and a spring brake section held off by air pressure that applies automatically if that air is lost
2. A front section for steering and a rear section for braking
3. A primary section for the horn and a secondary section for the lights, neither one related to how spring brakes apply or hold the vehicle
4. A hot section and a cold section that trade air seasonally

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