Twisted46

Victory!!!!! Brake booster replaced (45 minute job) and i can barely move the pedal with the car off!!!! I spent so much time and money chasing down a $.01 piece of rubber but I have better brakes for it. Thanks for coming along for the ride everyone!

It has already been started but your transmission is going to be the deciding factor here. If you don't have an overdrive gear your cursing RPM will be very high.

It sure is a good feeling, enjoy!

There are some calculators you can use but I would seriously consider 6g as your biggest load will come when the car sits for a while and the alternator has to charge the battery. I blew a fusible link by letting and alternator charge an almost flat battery. You will likely never have an issue with 8g but it only takes one unlikely event for hell to break loose. https://www.engineeringtoolbox.com/amps-wire-gauge-d_730.html Yes POs are the biggest problems when working on old cars. I spent weeks looking through the 260z wiring diagrams and probing with a multimeter. I would start at thr tach and work your way to thr end of the loom if you think wires have been crossed or replaced.

The OEM tach in your 280z should work just fine hooked up to the HEI output. There should be two black - white wires if you are using OEM, If not then refer to the manual for that harness. Look at the JTR book to make sure you have them correct. I ended up yanking my wiring and going full race car with my own relay and fuse boxes and switches.

Well I don't see a reaction disk in there.... Edit: also based on the crustynes of the booster and the fact that i can get one from autozone for under $100 with tax and shipping I plan to just replace it.

I will check again, I plan to pull out the brake booster anyways to replace it because it keeps making this god-awful honking sound every time I press the brake pedal. I hate to waste another $100 but it's the last hope part of the system.

A short update, I adjusted the push rod out a little bit and that help with the pedal feel slightly. I need to back it off a little bit as the as the rears would lock up after heavy use. I still do not have enough pedal feel and when I hook up vacuum the pedal goes to the floor instantly. This still seems like an air issue but again we cannot get any more air to bleed out. I was wondering if the safety switch under the master cylinder can cause issues when it gets older? also is there any chance a bad brake booster would cause this? I am only asking these questions because I plan to replace the lines this weekend and I really never want the best with the brakes again. so if I need to replace either of those now would be the best time.

So I decided I needed a break from working on the brakes.. HAHA.. Anyway I took it to a shop and they tried for 3 hours and didn't make any progress, they took the MC out and bled it and then went to the corners in the right sequence. I wanted them to try before all the lines are yanked out and the car is down for a long time.. again...

Sold

I've got a roll of 3/16 copper tube and a package of M10 flare nuts on the way. I really didn't think much about the hard lines because the brakes worked when I bought it. I am thinking that is a massive air trap though. The good news is that the line from the engine bay to the rear T is fine. Happy Birthday America, Enjoy your holiday all.

Indeed, someone put some pig tails, 3 or 4 on the passenger and 6 or 7 on the drivers side near the rear drums (now calipers.) I will upload some pictures shortly.

Well the Wilwood MC is in and.... still the same problem. Now I am wondering if the problem is the POs crazy brake lines coils they put in the lines for the rear. I will try to get a picture later.

Be warned, the adapters from Flyin Miata are no longer the correct part for this swap. From the description "Adapters have an M10x1.0 inverted flare female fitting and 1/8 NPT (1/8-27) male on the other." I had to cut my lines and install new fittings, not a hard job but definitely ruins the day when you were expecting a 30 minute job and it turns in to a 2 hour job.