Side brackets for ATLAS MODULAR slider with pneumatic bumpers are designed for fast setups, requiring high-performance brakes in case of emergency.
We always recommend them when the high-speed SERVO DRIVE is in use, but you can use them with all ATLAS configurations if there's a risk of hitting the side bracket with the slider's cart, e.g., using third-party software to control your slider.
With all SLIDEKAMERA controllers, the slider's drives won't work if they're not calibrated for a particular length of the rails. That means the slider's cart will never touch the side brackets during standard operation.