What is the difference in operation and stroke limits between clamp-type and bolt-type brake chambers?

1. Clamp-type chambers are only used for trailer axles under SGI rules
2. Clamp-type chambers use a clamping ring to seal the diaphragm and have shorter stroke limits, while bolt-type use heavy bolts and have different safety limits
3. Bolt-type chambers are hydraulic, whereas clamp-type are air-operated
4. Clamp-type chambers self-adjust automatically, whereas bolt-type must be manually adjusted