Science 8

Internet sites
 
The basic idea for your diagram on hydraulic systems
How Stuff Works - Hydraulics
http://science.howstuffworks.com/hydraulic1.htm

Hydraulic elevators for the explanation:
How Stuff Works - Elevator
http://science.howstuffworks.com/elevator1.htm
 
Click here for explanation:  Hydraulic brakes
[ http://auto.howstuffworks.com/brake.htm ]
And here:
http://auto.howstuffworks.com/brake1.htm
 
Both the diagrams and explanations can be found on these sites: 
Nail Guns: Pneumatic systems
http://home.howstuffworks.com/nail-gun1.htm

Jackhammers
http://www.explainthatstuff.com/jackhammer.html
 
Car lifts
http://science.howstuffworks.com/hydraulic.htm