M50 swap that will blow your mind.
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Onwer of
1987 e30 325e soon to be s50
1991 e30 318i four door
1994 e34 530i 5speed
05 e53 X5 4.4i fully loaded -
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Found the brake fittings to use.

Sent from my iPhone using Tapatalk ProOnwer of
1987 e30 325e soon to be s50
1991 e30 318i four door
1994 e34 530i 5speed
05 e53 X5 4.4i fully loadedComment
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i pulled one of these boosters on sunday from pullapart. and from what i can tell it seems to be about the same size as my e32 booster if not a touch smaller. but its hard to tell since i dont have a good way of measuring my e32 booster thats crammed in my engine bay. the master that was on it i left at the yard, and had the bore size markings of 25mm and 22mm. unless you're just trying to get a slightly smaller booster, i dont know that there would be much benefit of this booster over the e32/ix. and it doesn't look like the older master cylinder options will fit this one, as the master mounting stud spacing is different from the e32 booster. its about 4" between studs as opposed to my e32 booster at around 3 5/8" between studs. i did order a master cylinder on ebay from a 98 mercedes slk230, with bore sizing of 23mm and 19mm, which should be closer to stock e30 sizing. this one does appear to have the correct spacing for my e32 booster.
*edit-ok it could still be a great option for those who want the feel of a 25mm master and newer parts than the traditional swap options. but if you're like me and already have the dual diaphragm it might not be worth the extra workComment
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Onwer of
1987 e30 325e soon to be s50
1991 e30 318i four door
1994 e34 530i 5speed
05 e53 X5 4.4i fully loadedComment
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This comes a little too late for me as I went with a 944 booster mainly because it's 90% plug and play and uses the stock E30 MC but this info is good to know. I'm sure there are others out there that will work, it just takes someone to try it first. As plentiful as E92's are the parts will be cheap as many of them show up in the junkyards and being newer parts perhaps more reliable and in better condition. Thanks for posting and helping out the community.
Perhaps we can highlight exactly what needs to be done/why with specs and part number of the booster for reference. Maybe the booster is used on other models."I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj
85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
88 M3 - LACHSSILBER/SCHWARZE
89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER
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This comes a little too late for me as I went with a 944 booster mainly because it's 90% plug and play and uses the stock E30 MC but this info is good to know. I'm sure there are others out there that will work, it just takes someone to try it first. As plentiful as E92's are the parts will be cheap as many of them show up in the junkyards and being newer parts perhaps more reliable and in better condition. Thanks for posting and helping out the community.
Perhaps we can highlight exactly what needs to be done/why with specs and part number of the booster for reference. Maybe the booster is used on other models.
I’m going to do a full write up on this when I have some time and with pictures with step by step. Maybe even a video.
Sent from my iPhone using Tapatalk ProOnwer of
1987 e30 325e soon to be s50
1991 e30 318i four door
1994 e34 530i 5speed
05 e53 X5 4.4i fully loadedComment
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Subbed, Id be interested in a write up and pin as well. Just finished up the wiring harness repin on my s52. Next step was brake booster.Comment
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Go buy a e90/91/92/93 booster, it’s worth it. Get the brake fittings from your local auto store and get the pin I make.
Sent from my iPhone using Tapatalk ProOnwer of
1987 e30 325e soon to be s50
1991 e30 318i four door
1994 e34 530i 5speed
05 e53 X5 4.4i fully loadedComment
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Interesting man!
So now I’m testing things. I put the brake lines on the master, the master is a 1/4 in compared to 3/16. E39 has brake fittings that are 3/16 hole but 1/4 thread.
If you guys have any questions or need any help, hit me up here or give us a call at globo auto.
If I was in a pinch I could temporarily use 1/4 to 3/16 brake line adapter correct?





















Update




Rx7 brakes are awesome with this booster

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Just so you guys know this is what you need to fit the lines in the master.
Sent from my iPhone using Tapatalk ProOnwer of
1987 e30 325e soon to be s50
1991 e30 318i four door
1994 e34 530i 5speed
05 e53 X5 4.4i fully loadedComment
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I was thinking about upgrading my master cylinder to the e32 one, but this comes in waaayyy cheaper. I was looking online and I just don't see where the clutch reservoir would attach to.
I see these tabbed off ports, but I'm not 100% if that's where it would attach toComment
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I was thinking about upgrading my master cylinder to the e32 one, but this comes in waaayyy cheaper. I was looking online and I just don't see where the clutch reservoir would attach to.
I see these tabbed off ports, but I'm not 100% if that's where it would attach to
What motor are you using?
Sent from my iPhone using Tapatalk ProOnwer of
1987 e30 325e soon to be s50
1991 e30 318i four door
1994 e34 530i 5speed
05 e53 X5 4.4i fully loadedComment
-
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