On a truck with hydro boost they should be installed after the booster as close to the booster as possible.
On non power or where the booster is between the pedal and master cylinder it should be as close to the master as possible.

The difference between men and boys is the price of their toys.
Grant from Roy, Washington
1956 6100 Chevy Dump Truck in the Gallery
1964 GMC Drump Truck in the Gallery
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http://s1301.photobucket.com/user/56Taskforce/slideshow/