M50 swap that will blow your mind.

[atldohc]

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 work

[Noshow20x96]

Found the brake fittings to use.




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[Sh3rpak!ng]

subbed

[Noshow20x96]

Subscribed.



I'd love a full write up if possible?, looks extremely interesting and I would go this route including purchase of pin. I'm in the midst of upgrading my front brakes with wildwood BBK and new e32 master. If it were to match this booster, my braking would be ridiculously awesome.



Thanks in advance for this.

I will make a write up on all the parts that are needed for this swap. Still trying to find the brake fittings for the master.


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[IRON-E]

Subscribed.

I'd love a full write up if possible?, looks extremely interesting and I would go this route including purchase of pin. I'm in the midst of upgrading my front brakes with wildwood BBK and new e32 master. If it were to match this booster, my braking would be ridiculously awesome.

Thanks in advance for this.

[atldohc]

does anybody know if other masters will bolt up and seal correctly to this booster, and what the diameter difference is compared to the e32/ix booster? im getting tired of my e32 booster and 25mm master in everyday driving since its kind of like stepping on a rock, and the pedal is noticeably higher than the gas and clutch pedals because of the bore size. ive ordered an e36 master in 23/20mm that looks like it should work, and hopefully increase my pedal travel and decrease effort. if the master will fit i might try this booster at the same time

[hoveringuy]

Only downside to the e90 booster is the brake line outlets point toward the engine. The x3 has similar specs, but outlets point in the same direction as stock. Lines will still need to be modified a bit though, as the thread size is a bit larger like the e90. Also, my X3 booster/mcyl is TRW. The e90 I tried is ATE. Although they look identical, there is a slight difference in mcyl push rod bore, so booster and mcyl need to be from same manufacture.

I'm using this setup with the 5 lug swap w/ e46 m3 brakes. Awesome combo.

It looks like the diameter is smaller (10") but the length is more like an ix booster.


I'm not clear on where the pin goes, is it between the MC and the booster or at the clevis for brake pedal? (sorry, been a while since I've had my brakes apart).


Regarding the mismatch in brake line fitting thead size, how are they modified to fit?

[Noshow20x96]

That e90 brake booster looks interesting. Mine has vw golf booster which works well. But now that I have driven e39 for whole winter, I really like the large amount of brake assist it has. I would like to have that in e30 also. But the e39 booster is huge.

This booster is a huge upgrade compared to the old one and the other options people do. I’ve been driving the car for about two weeks now and it still surprises me.


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[pazi88]

That e90 brake booster looks interesting. Mine has vw golf booster which works well. But now that I have driven e39 for whole winter, I really like the large amount of brake assist it has. I would like to have that in e30 also. But the e39 booster is huge.

[Noshow20x96]

Another one made.






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[DrJosh]

$35 including shipping?

[wworm]

I'd be in for a pin. Might be a good idea to post in the group buy section if you're serious about making them. Less than $25-$40 range is super reasonable.

[Noshow20x96]

I'll also need a pin

Potentially in for a pin depending on price...

This is perfect timing for me. I am gathering parts for a M54 swap and have been looking through my braking options. I just pulled the trigger on one off ebay. These things are cheap.

Do you happen to know the e90 master cylinder specs compared to the E30 one?

I'm interested in this for sure. What would you charge for a pin? I haven't looked into it as I am just now reading this, but it would be sweet to make a parts list, and see what else is needed and if those parts a reasonable to order new.

So the people that are interested in the pins or would like to be interested in getting one, what would be the ideal price of the pin. It takes about 45 minutes to make on the lathe and a couple bucks in material. What do you guys think I should sell them for.


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[DrJosh]

I'll also need a pin

[cwlo]

Only downside to the e90 booster is the brake line outlets point toward the engine. The x3 has similar specs, but outlets point in the same direction as stock. Lines will still need to be modified a bit though, as the thread size is a bit larger like the e90. Also, my X3 booster/mcyl is TRW. The e90 I tried is ATE. Although they look identical, there is a slight difference in mcyl push rod bore, so booster and mcyl need to be from same manufacture.

I'm using this setup with the 5 lug swap w/ e46 m3 brakes. Awesome combo.