Everything you wanted to know about brake boosters and master cylinders

[matt]

any way to custom make the reservoir lines? $80 is alittle much for some lines.

I used:

2002 remote reservior - 34 32 1 112 399
34 31 1 121 911 x2
34 32 1 102 282 x2
And some standard braided brake hose. That's all you need.

Dot.

[BDSax]

just bought mine from the dealer, was only $71 and looks very easy to make is i could get the connectors

[Bimmer335is]

BUT will a remote reservoir be required?

The answer is yes.

[golde30]

i also have an IX booster/master that i was planning on using. i read this whole damn thread and the working combos still arent clear to me. i know i can use this setup, BUT will a remote reservoir be required?

[BDSax]

any way to custom make the reservoir lines? $80 is alittle much for some lines.

i have a ix booster and master cylinder but there is a 85 and 88 735i at the local yards. should i take the booster and masters and use it instead????

[2002maniac]

I am also wanting more info on this. I have a 325iX booster and a 325iX master here ready to go. What is the reason for needing a remote res?

Matt

If that's the master you bought from me, it's not an IX master. It is from a 735i. It's the same as the 25mm E34 M5 MC

[FredK]

Sweet.

[Mr.SWISS]

I tapped the shaft with a M12x1.75 die first, then filed the threads off. This put me at around 10.5mm in diameter. I then filed a little more material, then used a nice high quality M10x1.5 die to make some threads.

I believe cutting M12 threads and drilling the stock brake fork a little larger and tapping M12 threads would also work; there's a good amount of material on that fork.

Did it, it worked. Took me about 30 minutes from start to finish. I had a buddy chuck a drill on one side of the shaft and turn it slowly while I put a high grit pad on the buffer and hit it. bufffed a taper on the end after cutting it to length, then took a 13/32 bit and drilled out the fork and tapped it. PERFECT!! Just went and bought a M12X1.75 nut,and I was worried. :rofl:

[FredK]

I tapped the shaft with a M12x1.75 die first, then filed the threads off. This put me at around 10.5mm in diameter. I then filed a little more material, then used a nice high quality M10x1.5 die to make some threads.

I believe cutting M12 threads and drilling the stock brake fork a little larger and tapping M12 threads would also work; there's a good amount of material on that fork.

[matt]

I have been suggesting using an iX booster from the start.

You can cut it and weld it...

[Mr.SWISS]

A die.

I will try to get some pics. I used:

2002 remote reservior - 34 32 1 112 399
34 31 1 121 911 x2
34 32 1 102 282 x2
And some standard braided brake hose. That's all you need.

Man that's alot of metal to try and die off. the shaft needs to be milled down to the same as the e30 booster to tap a m10X1.50 thread, are you suggesting tapping the outer shaft with a M12 and then drilling and tapping the fork larger? :-?

[matt]

I already spent $160 on a new e21 booster, I would just like to know what is the best way to get this rod threaded. And a lathe won't work.

A die.

I will try to get some pics. I used:

2002 remote reservior - 34 32 1 112 399
34 31 1 121 911 x2
34 32 1 102 282 x2
And some standard braided brake hose. That's all you need.

[Mr.SWISS]

I found an IX booster and MC for around $80 from my buddy bill over at MSR. Call him at 201-675 6658 and see if he can get you one. If he can't I know he can find someone who can. Tell him Jason sent you.

I already spent $160 on a new e21 booster, I would just like to know what is the best way to get this rod threaded. And a lathe won't work.

[triggrhaapi]

Shimming a few mm won't hurt anything, your driveshaft will shift more than that when you hit hard bumps.

[BigD]

I needed about 6mm to fit the stock downpipes. It can vary some though.

To do this properly, don't you have to also shave the intake side by the same amount, and do the same to your transmission mounts? Otherwise won't your drivetrain sit crooked? (I know it makes a small difference but when I was daydreaming about an LS1 swap, I was told to stay away unless I know what I'm doing because you have to make custom mounts and driveline alignment needs to be precise or you're setting up a timebomb)

Also, Matt, can you post pics of your remote reservoir setup? You say you did something cleaner than the 740 setup, I'm sure we'd all like to know!