I know this must have been answered before and a went through 100+ pages of Mark 8 requests and then I saw the tally; 1146 pages ! Only JUST over 1040 to go ! I have a 93 Mark 8. Swapped out the front air for steel from a Thunderburp. I noticed there was a definite quickening of response in the front without any real deterioration of ride quality. I was liking this! No more wondering what height the car was going to be at when I go to get in. All was well for the first week, maybe ten days. Then the rear started to drop ever so slowly. I completely expected that, anything that holds compressed air with a rubber bladder eventually loses air. The problem is that when I turned the air ride switch on, nothing happened. What am I missing here ? On the other hand, is there a Schrader valve in the system somewhere? I can handle pumping it up every week. I always wanted to just have one for each side anyways to set it where I want it, just like my trucks with their airbag load levelers. How hard would it be to set it up with a Schrader valve for each side mounted in the trunk?