When a vacuum assisted unit fails your brakes become very stiff and hard to engage often times worse than just a manual braking system.  When a hydro boost unit fails you have 2-3 more power assisted stops before you go to a manual pedal feel.  This type of system is really useful for a daily driver or even just your weekend warrior. Diagrams on how to run your lines can be found here.

• Brand new booster

• For any 2 wheel or 4 wheel disc brakes

• No external vacuum pump required

• Generates 1200 to 2000psi to the calipers

• Powered by pressure from the Power Steering Pump
  
  Note: No steering pump is required

Price: $799.95