Another idea on brakes???

[Doug Goodwrench]

I am still new to the W-body cars, but why hasn't anyone converted to the bolt on vacuum booster?
I hear all about cutting a firewall section out of a donor car and well .......you know the rest about the cam lock type.
Maybe instead, the existing four bolts could be used for an adapter/reinforcement plate.
Any one ever considered this?
I can't be the only one.

[Dark Ride]

I actually just tried that this week.  (Before I Saw Your Post)  I tried bolting up a '93 Cutlass Ciera's Brake Booster to the firewall plate, but it didn't work.  I just couldn't get it to fit in well enough to trust it to bring me to a stop from 100+ MPH :D .  I am going to swap the firewall plate and just do it the way everyone else is.  At least I know that way works.  Maybe it would fit with a little Fabrication, but I just don't have the resources to try and make something work.  Plus I've got a W-Body Car to pull the regular brake system out of, so its free for me.

BTW, if you use the bolt-in Brake Booster, you still have to use a W-body Master Cylinder, or one that is proportioned right for the Rear Disc Brakes.

Also, I was curious where you saw pics of how to swap the plate, because I've never done it before.

Thanks, Mitch

[Doug Goodwrench]

Since I work for a NAPA store, I have the luxury of having cataloging with part pics. The parts are pictured by themselves, some are shot from different angles.
We also have a TGP carcus sitting around the back of the garage with the PMIII removed. That's how I came up with the idea for the adaptor plate.
Engine and trans is in an '88 Fiero, so I have use my imagination as to exactly how much room I have to work with on my TGP.

I am not absolutely sure about converting the PMIII to anything yet. But If I do, the proportioning to front/rear will be correct.

As for being able to stop from 100+, the Camaros do it. Only difference is they are RWD. So if I were to use a master cylinder from one of those
proportioning maybe still slightly incorrect, but close.

Gotta go to work now.
Later