Air bag jack

[gkent]

forgive my ignorance, but what situations require lifting the car off of a hydraulic 4-post Jack? The car is already in the air - I'm confused.

Changing tires, front brakes. The list goes on !!!

 

[68 Sport Satellite]

Changing tires, front brakes. The list goes on !!!

if I'm changing tires or front brakes, my car is on the ground on jack stands. If you've got a 4-post lift, I guess it sounds a bit easier - never thought of that.