Or you could use the simple solution - push harder!Ahh, I figured at some point there would be fluid pushing at the entrance to the MC. So that's just a rod you push on? Hmm. Well that doesn't sound overly challenging.
Ahh, yes. The Opel GT community pointed me in the right direction of the proper fittings and such, I ordered those 2 years ago.
Ahh, good to know.
I think that intimidates me less than:
A - Spending at least an extra $100 for the iBooster MC, and,
B - Changing the fittings over.
I do already have a beefy 12v vacuum pump.
But, either solution is going to require a fair amount of custom work. To archive this here instead of just my Salvage Thread...
The Opel GT brake booster sits on a weird 2 foot long extension at the front of the hood, to get it all the way past the entire engine, for space constraint reasons:
View attachment 130042
And my brake booster is in questionable state of functioning (it holds pressure, but I'm skeptical, as I mistook a large hexagonal seal for a plastic bolt and spun it way too many times). And, my replacement brake booster isn't from a GT, it's from a Manta, which has a different pushrod:
I think I've mostly decided not to keep the booster in its original janky location.
So that means I'm likely to choose between relocating the brake booster, and switching over to the Manta one (with a vacuum pump), or, using the iBooster (with a fabricated master cylinder).
1 - Make a bracket for Manta booster near the firewall.
2 - Make a bracket for 12v vac pump
3 - Wire it up.
4 - Build/buy a vac reservoir.
5 - Make a mount for the vac reservoir.
6 - Make vacuum fittings to the reservoir.
7 - But and mount a pressure switch so it knows when to turn off, and wire that up to.
8 - Fabricate a booster pushrod adapter (doesn't match the GT's original)
9 - Still deal with the noise.
// OR //
Using the iBooster and the GT Master cylinder:
1 - Make a bracket for the iBooster.
2 - Wire it up
3 - Make and mount a plate to hold the MC to the iBooster
Both solutions will need new lines anyways (lines were cut for previous owner's V8 attempt). So there's no savings there.
So, if I'm doing the lazy "just get it done" thing... which is actually the laziest? The 12v vac pump solution has very little problem solving (which is the real time sink), and probably no hard obstacles. The iBooster solution is definitely easier, unless I struggle mating the GT's MC to the iBooster, and then I'll probably regret it.
And, I'm cheap, and this is supposed to be a fairly extreme budget build from garbage and unwanted items, but I bet every time I hear that vacuum pump turn on I'm going to wish I could pay $1 to not listen to it, and that pays for the iBooster in a couple months.
I guess then, not having really seen what's involved, how stupid is it for someone with an angle grinder, drill, and tap & die set to attempt to mate those two components together? Like, "take your time and you should be okay"? Or, "Even being your most careful you're not going to pull that off"?
A small light car like the GT does NOT need a brake booster - the first time you drive it the brakes will feel heavy - after 5 minutes they will feel "normal"