Dark Ride Posted January 23, 2006 Report Share Posted January 23, 2006 I may have found a Vacuum Brake Master Cylinder that will fit in the TGP. I Pulled it out of a '93 Olds Cutlass Ciera. The Power Brake Booster and Master Cyclinder look identical to the one My Grand Prix LE with one exception, Its Bolt-In! I haven't removed the TGP's Master Cylinder yet, so I can't be certain, But It would be really cool if it fit. (Cuz my PowerCrapper III is junk) Has anyone ever done this, or knows if it will or won't fit. Any tips are appreciated. Thanks, Mitch Quote Link to comment Share on other sites More sharing options...
skalor Posted January 23, 2006 Report Share Posted January 23, 2006 I don't know how the vacuum brake booster bolts in, but the master cylinder is different than ones used in W-bodys. A-bodies have rear drum brakes so the master cylinder is proportioned wrong for our cars since we have rear disc brakes. The good news is though that the master cylinders between A-bodies and W-bodies are identical externally so you can just use one from a W-body if the vacuum booster does indeed bolt in. I'm in the process of converting my TGP to vacuum brakes, but I plan on just changing the firewall plate to the correct one. Quote Link to comment Share on other sites More sharing options...
Pontiac6KSTEAWD Posted January 23, 2006 Report Share Posted January 23, 2006 Not true, the Pontiac 6000 STE came with rear disc. Also, the brake boosters are the same from the All disc models, to the rear drum models. It has a inline proportioning valve. And since he is going to swap master cyl for master cyl, it aint gonna make a diference. I would like to see how this posible conversion comes out. It sounds promising.. Quote Link to comment Share on other sites More sharing options...
skalor Posted January 23, 2006 Report Share Posted January 23, 2006 I know the STE 6K came with rear disc brakes but he stated he was using parts from a Ciera. Plus, the non-ABS STE 6K was dropped before W-bodies came out so the master cylinder that W-bodies use didn't exist yet, which is why they used external proportioning for the rear disc like you mentioned. He can go ahead and use an A-body master cylinder all he wants, but the proportioning is going to be wrong if he uses one from a Ciera. Plus, if it's a JA1 braking setup it will only have a 22mm bore, while JA2 and all W-bodies used a 24mm bore. I've researched master cylinders for A-body rear disc conversions extensively and found that W-body master cylinders are a perfect match for anyone with an A-body doing a rear disc conversion. I agree that the brake boosters are the same from drum to disc, but I'm unsure of how they may be different or not from A-bodies to W-bodies. Quote Link to comment Share on other sites More sharing options...
Dark Ride Posted January 23, 2006 Author Report Share Posted January 23, 2006 The good news is though that the master cylinders between A-bodies and W-bodies are identical externally so you can just use one from a W-body if the vacuum booster does indeed bolt in. So that means I could take a Master Cylinder from say a '89 Buick Regal and bolt it to the Power Brake Booster from the Ciera, Correct? If so thats what I'll do, and I'll keep you posted as to how it turns out. Quote Link to comment Share on other sites More sharing options...
TurboGTU Posted January 24, 2006 Report Share Posted January 24, 2006 I think the Ciera and the Beretta had the same brake parts. SO the unit will not bolt on right for a PMIII equiped car. Quote Link to comment Share on other sites More sharing options...
Dark Ride Posted January 29, 2006 Author Report Share Posted January 29, 2006 Finally Got the Master Cylinder pulled from the TGP, and TurboGTU is right that it won't bolt right up. But after I removed the bracket that the PM3 bolts too exposing the bare firewall, it should only be a matter of drilling through the firewall to make the bolt holes, and hopefully have a much easier (and less time consuming) vacuum brake conversion. Quote Link to comment Share on other sites More sharing options...
tyroelite Posted January 30, 2006 Report Share Posted January 30, 2006 that'd be awesome... keep us updated. oh, and take pics so you can do a write up when you're done too Quote Link to comment Share on other sites More sharing options...
Dark Ride Posted February 2, 2006 Author Report Share Posted February 2, 2006 It didn't work, that firewall plate just wasn't meant for it. I got the holes drilled only to realize that it wouldn't fit well enough to get it bolted in. :bawl: Brakes just aren't something I want to fail on me. So I'm going to do it the way everyone else is. How exactly do you change the firewall plate, I'm not sure exactly what I need to do to change it. If someone has done this before how did you do it? Thanks, Mitch Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.