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Hello Guys, first post and straight a brake thread - I`m sorry, but I read hours on hours in the FAQ section and in a lot of other brake related threads but couldn't find anybody who has done this. So on the weekend I bought a 78 280Z and I´d like to go down the performance road while still keep it kinda periodic correct so I don`t get problems with TÜV in germany and a historic licence plate. So the car will get fully striped down, an exterior backdate to 240z, suspension upgrades, fender flares, exhaust, maybe tripple weber (have to inform myself a bit more on that vs EFI) etc. etc. A lot of people go straight to a rear disk brake conversion and complain about the brake bias and sometimes even damaged axels due to a different load on them compared to drums. Basically thats not what I wanna do plus the TÜV thing mentioned above. But what about keeping the drums in the rear, change the front to S12W and go with a 15/16 master. If I`ve seen that correctly thats what they did back in the day with the original FIA brake upgrade out of the competition catalog. They just went with 13/16 wheel cylinders inside the drums. (not sure about the mastercylinder with FIA brakes...) I just can`t find the size of the original cylinders inside the drums... Somebody did that conversion here in the forums? Is it working well with the original proportion valve or is a manual one capable of dialing in a proper brake bias? Probably have to run a couple calculations to find out (which seems not that easy with drums). But as of the drums are able to create a higher brake force with less hydraulic input they should work better as a rear disc conversion. What do you think? Any help or experience is welcome
Hi everyone, HybridZ is really where I come when I'm at a complete loss and everything I've tried hasn't worked. I'm going to be as detailed as possible so bear with me, I'll try to keep it concise. A few weeks back, I replaced the passenger side rear suspension assembly- everything from the control arm to the shock insulator. The driver side had already been replaced as it was previously damaged in a crash around the spindle area. At this point both sides of the suspension are from a later 280z. When I was adjusting the drums, the flathead I was using slipped and bumped the rubber boot of the wheel cylinder and a little fluid oozed out. Guess that explains my inconsistent brake pedal. I wasn't drastically losing fluid or anything, but it must have been a small leak that would occasionally rear its head and my pedal would be just a bit softer than usual. I grabbed an extra wheel cylinder I had that looked like it was in good shape and replaced it. That's when the trouble really started. I stripped the brake line bolt and the wheel cylinder threads. Bit the bullet and ordered a brand new wheel cylinder... cheap and not a bad thing to replace while I'm in there. I also got pre-flared brake line to replace the OEM one I messed up. I made sure it was Japanese style brake line- double flare and 10mm bolts. I "rented" a tube bender and shaped it as close to the OEM one as I could. I ended up with a 30" line as it was either 20" or 30" and I figured it was better to be a bit long than a bit short. Replaced the wheel cylinder, bolted the line up, made sure it didn't leak and didn't hit anything with the car lowered, and bled the rear brakes. Here's where I may have gone wrong- my understanding is the front and rear circuits are separate so leaving the fronts alone I only bled the rears at first. Finished the rest of my work and finally was ready to drive my car after not doing so for several weeks. I could tell immediately something was off. The pedal practically went to the floor right away but I could pump it and build up pressure. Ok, air in the lines or drum is adjusted way too loose. Checked both drums and they're tight but rotate as much as I want them to. Must be air in the lines still. Bleed the rears again and retry but it feels exactly the same. I think I bled my rear brakes about 4 times, then bled the front and rears, then bled the master cylinder, rebled the rears, and the pedal never felt different. On a recent endeavor to bleed the rears for god only knows-th time, the passenger bleed screw snaps in half inside the wheel cylinder. Fair enough, now I can have two new wheel cylinders. Again, cheap insurance. Replaced it, bled the rears again, and the pedal still feels the same. I get very light braking on the first push, but if I pump it quickly I get normal feeling brakes. Today I attempted to bleed the rears yet again. I bought a simple vacuum bleeder to do it myself. I'm a bit stumped because the driver side wheel cylinder just doesn't seem to want to bleed. I recruited someone to hop in and push the pedal so I could get a better view of what's going on. I crack it wide open and it seems like fluid is barely moving through it. On top of that, the pedal feels normal with the bleeder open and seems to build pressure better than with it closed! Is my cylinder bad? Am I going insane? To quote Zoolander... "I feel like I'm taking crazy pills!" I have a turbo motor waiting and this is really the one thing standing in the way. SOS!