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My Power Brake Booster in my 90 ZR-1 went bad so I had the pleasure of removing and installing it. Some tips that worked great were remove the seat! Crawl in the car head first facing up looking under the dash by the pedals with your feet in the rear hatch area. Make sure you get enough sweat in your eyes to make the job worthwhile, then try to figure out just how you are going to get to those 4 nuts that attach the booster to the firewall. After you figure this out, take a break to get the blood flow back to your head, then be patient and get the job done. Installation is reverse of removal! It's as easy as that!
<snip>...Some tips that worked great were remove the seat! Crawl in the car head first facing up looking under the dash by the pedals with your feet in the rear hatch area.<snip>
I see you took out the seat but the seat-track is still there... I hope you took the seat-track out too. That looks pretty uncomfortable - laying on that thing!
I had to do this about 10 times a few months ago on mine. First, the one from the store had the wrong rod and later I tried fixing mine and it went on from there. The auto parts store would not give me my money back on the one I got from them. Instead, they said they would get me the right one. Three units later and 6 next day air shipments (probably cost more than the unit did @ 150) they finally sent my old rod in so the rebuild place could put on the correct one.
My C4 is the first car I have every had to replace one of these things.
I found its easiest to lay outside of the car and reach up and undo the bolts from the booster in the passenger compartment. Make sure the bolts don't fall on the accelerator side. They can get lost in the acc. assy and they are very hard to get out. I used woble adapters to get to the bolts.