Brake Buddy won't stay put

Ro646a wrote:
I recently bought a Jeep Liberty to tow behind my motorhome. I used to tow a Chevy Tracker with a Ready brake system. This time I bought a used Brake Buddy to use in the Liberty. Today I tried to set it up for the first time. Whenever I hit the test button it jumps all over the place. It does not hit the seat squarely no matter how I position the back stop, and when it releases it jumps off the floor and goes toward the brake pedal(I mean it pulls itself to the brake pedal instead of pushing it).
I followed the directions, but I must be doing something wrong. Any comments?

Thanks in advance.

Make sure the floor mat is removed. Also after you clamp it onto the brake pedal, you are moving the unit up towards the brake pedal, until just before it depresses the brake, the actuater will be as short as it can get, or all the way retracted into the unit. Then move seat forward until it just touches the unit?