Hello,
My Volvo has 3-pin brake pedal position sensor. However the brake pedal position sensor connector does not give me a perfect fit(no click, loose) which causes intermittent cruse control. Any idea?

 

I've never changed one but if it functions when the electrical contacts are touching just shave one of the latching surfaces such that it does click.

Use a razor blade or Exacto knife

A dab of dielectric grease or silicone paste (translucent white) might get 'em the jibe.