When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
It firms up the air suspension, tighten up the seat belts, and apply full braking forces.......the car basically brace itself for impact.
I don't need a PCS for those actions.... if my son or wife is driving,,,except it is me instead of the car that is tightening up the seat belt, trying to hit the break pedal on passenger side, and definitely firm up the suspension. (butt muscles LOL)