Nasieg 5 lug installed - tips/pearls

[Eydreeyun]

This guy: http://www.r3vlimited.com/board/showthread.php?t=347702 used e28 wheel bearings with Mercedes w124 300mm rotors and e34 540i calipers with custom adapters.

[jph]

I just bought a set of these myself and it seems like the front offset will fall between the E30 and E36. I would love to run 17x8 et20 wheels up front, but I think the rotor spacer will make that a difficult task. I'd like to know if there are any other rotor or rotor/caliper setups we can run for the fronts that will help us get a little closer to E30 specs. I think the rotor spacer itself is 6mm so just doing away with that should be the ticket. Anyone experimented and found a setup that works without the rotor spacer?

[jph]

I'll have to get measurements on the lines in a day or so.

Did you get the chance to take measurements for the rear lines? I am piecing this kit together now. Thanks

[mr2peak]

Really glad you discovered that before something bad happened!

[diesekte]

Well I got it figured out. Finally.
The brake masters are both totally fine and both 25mm. The issue was with the brake booster. I removed the installed master to compare them and noticed the pushrod in the booster was pretty loose. I pretty much looked at it and it fell out, along with the metal retaining washer deal that keeps it in the plastic cup. I replaced with another ix booster and now I only have about 1.5" of pedal travel total, and am getting some brake action just a few mm in, instead of the 2" or so I used to have to push before they started working.

RIP old ix booster :/. Any rebuild kits available?

[mr2peak]

Something definitely seems off, you shouldn't have that much free play. Definitely see if the old master was a 25mm.

[diesekte]

I'll have to get measurements on the lines in a day or so.
I installed the 25mm master today, 34331156978, the e32 735il master that should work with the ix booster. It fits and works. I pulled it from an 89 e34 525i with an m20 - as per realoem it is the same part.
When I was at the yard I pulled the MC from a 91 e34 535i with an m50 for comparison - p/n 3431115711. These two look almost exactly the same. The piston that comes out the rear on both is the same bore and same length. The MC bodies are almost identical.
When I pulled the MC installed on my car by the previous owner, it looked a hell of a lot like 34311157111, down to the weird Arabic looking letter on the back and the "1043" marking http://www.ignacedewitte.com/zimages...re-frein-2.jpg
What's strange is to get to the above picture, I actually googled 34331156978.

To make a long story short, I switched my MC for a supposedly different, and definitely 25mm MC, and the pedal feel is exactly the same. I mean exactly. 2 inches or so of little to nothing, then almost full force braking from there on, with minimal if any transition zone. My only conclusion is the previous owner had installed a 25mm MC, and this is just how it feels with this kit. I have driven every iteration of the audi A6 since 2000, and they have all felt like this to me... Maybe it's normal with these components...

[mr2peak]

Maybe start looking at lines for other BMW's to see if you can find one that's the right length?

If not, you could probably make a few sets of custom ones and sell them here.

What would be the appropriate length?

[diesekte]

An e30 SS line alone is too short to go from the e30 hard line to the caliper, since the hole on the e39 caliper is on the inner side instead of on the top like the e30 calipers.
Using the e39 line is barely too short - it connects but leaves a pretty acute bend in the line and has it under a bit of tension.

[mr2peak]

Why don't the E30 lines work? Just wondering.

[diesekte]

Ah - I found the thread. The ix booster bolts are too big for the master.
It looks like the e32 735 master (34331156978) works with the ix booster.
I actually have a 24v IS, but the previous owner used an ix booster. I'd rather keep the same booster as it works fine and I'm substantially over budget at the moment lol.

Now - any idea about the rear brake lines? Is there any solution short of a custom line? My other thought was finding e39 SS rears (if possible) and just screwing them into the e30 SS rear lines like I have now. But that doesn't solve the length issue.

[mr2peak]

It doesn't fit. Check out the 24v swap forum for details. It's a problem with the mounting bolts.

If you have an IX, you might need to swap out to a more common smaller booster, 944 or similar in order to fit the larger master. I'm not very fluent in IX, so definitely do a bit more searching beforehand.

[diesekte]

I had been looking at the e32 750il master which is 25mm. The reason I was bringing up the ix booster is because, at least on Turner's page for the 750il master it says "not for ix", but doesn't say exactly what the issue is. Does anyone know if the 750 master works with the ix booster?

[mr2peak]

Summit Racing had fairly inexpensive bias adjuster btw.

[mr2peak]

E46 M3 uses a 25mm master so that should work.

You also have to take the pedal leverage ratio into account. Not sure what the pedal ratio is on the E46.

Ideally, you can mod the pedal to have an adjustable pedal ratio, like the wildwood pedal box. This would allow you to eventually get it perfect for your car.

You should also, ideally, install a brake bias adjuster. Just because this kit comes close to the stock ratio doesn't mean that it's the correct ratio when you have much larger brakes installed. You need to make sure that the fronts lock up before the rears or you will end up spinning the car.