Hydaulic handbrake example - (sourcing the handbrake, master cylinder, slave cylinder and lines are your choice. Derek Speare has posted several examples that can be found on ebay)
This is probably one of the simplest to accomplish as everything can be purchased ready-made. You just need to find the parts and put it together. The hardest part for someone will probably be not making a mess when bleeding the brake lines.
Here is an example handbrake:
http://www.ebay.com/itm/HYDRAULIC-H...-DRIFT-HORIZONTAL-VERTICAL-BLUE-/261085921723
Example slave cylinder (pull type):
http://www.ebay.com/itm/Wilwood-Pull-type-Slave-Cylinder-NEW-260-1333-/390562921899
Skate board bushings can be used on the slave cylinder. You choose the hardness to select how hard the brake is to pull.
This type of sensor should work for this:
http://www.ebay.com/itm/Pressure-transducer-or-sender-500-psi-for-oil-fuel-air-/250988155990 However, I am not positive on the pressures involved, the one linked is 500 psi. It will not matter TOO much as the CSP board automatically calibrates it's minimum and maximum. Transducers of other PSI ratings can be found here:
http://stores.ebay.com/Industrial-stuffs/Pressure-Transducer-/_i.html?_fsub=2911276017
Wiring... Copied directly from the ebay page:
Red: +5V. Black (yellow): ground. Blue (green): signal output.
3.3v from the PCB should still work for this fine as the sensor just acts as a pot. Attach pin 1 on the board to the Red wire on the sensor. Attach pin 2 on the board to the (blue/green) wire. Attach pin 3 on the board to the (black/yellow) wire.
I highly recommend soldering any connections you make and using heat shrink tubing to protect them. Remember, put the tubing over the wire unshrunk BEFORE you solder.

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