The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support JNZ Tuning
Please Support Fuel Injector Clinic

3G brake master in a 2G

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Has anybody found an adapter that works for those of us running stock brake lines and the 3g mbc? I see a lot of talk about adapters that 'might' work but does anybody have a link to one that they are currently using or know to work?

I've had mine installed the wrong way for awhile now. I'm basically looking for a M10x1.0 bubble flare male to M10x1.0 inverted flare female.
 
didnt see any mension of weights? any body weigh any boosters? did anybody notice less booster power going to the single booster?

I was looking to save weight by going with a lighter booster setup. ending up trying a bmw alloy tandem booster. will do a seperate thread about it when car is running again. certainly not a bolt in type mod. but on my car it shaves about 3lbs which was well worth it for what I am doing with my car..
 
I got a 3g BMC/BB but it seems that the bubble flared fitting on the master cylinder is a 12mm, not 10mm like the stock lines. Does the 3g BMC come in many variations? (did the V6 3g eclipse come with a 12mm fittings?)
I read that you only replace one line, but how can you when its smaller than the fitting at the master cylinder?
 
So, I have Brembo calipers to slap onto my 2g. Going to rummage my local junk yards to look for a 3g BMC/BB. Just wanted to confirm my grocery list (taking most of the info from gofer's post):

Done and done. Now its just time to give it some time out on the road and see how the new brake setup performs. I've just got to put my car back together and its still in pieces so it may take a few days of wrenching.

As for the brake line that needed replaced I went to a local plumbing supply shop that carry's Earl's fittings, I snagged a 34" Earl's SS -3AN line and (2) Earl's -3AN to 10x1 adapters.

Here are the part numbers for the fittings and line...
  • The 3g (2003) Eclipse 17/16" BMC (bolts perfectly, and clears strut tower)
  • + the adapters and lines quoted above

..checked into the Earl fitting mentioned above and the description states:
http://www.anplumbing.com/Adapters/Brake Adapters-90.html
Works with Inverted Or Bubble Flare. Steel Brake Adapter. 2 Per Package. Zinc Plated Steel

I know a few older posts keep mentioning to use the correct adapter since the 2g is an inverted flare and the 3g is a bubble flare, but according to that site the same adapter should fit both applications. I also believe gofer, and a few others have posted not having any leaks, have daily driven, and done track events. Yes? No?

I got a 3g BMC/BB but it seems that the bubble flared fitting on the master cylinder is a 12mm, not 10mm like the stock lines. Does the 3g BMC come in many variations? (did the V6 3g eclipse come with a 12mm fittings?)
I read that you only replace one line, but how can you when its smaller than the fitting at the master cylinder?
One option would be to make the line with what I quoted above. The other side of the adapters would still be -3AN. So, if your BMC is really 12mm, then you would get -3AN to 12xwhatever adapter.
 
Last edited:
not that many ppl will want to do this, but i did a 3g BMC/BB in my 1g with the outlander upgrade, and just reflared/rebent the lines. took about 10 min and doesnt leak.

also, i used the stock 1g resevoir, res-lines and grommets, no leaks anywhere, just no the "tightest" fit on the resevoir.
 
For anyone who wants to order the adapter + ss line check eBay. Summit wanted to charge me $15 for S&H through their site, but went through their eBay store and only paid $5 for both items shipped. I know us DSMr's like savings :D
 
I've been debating how to tackle the 3G master cylinder port mismatch issue. Despite others simply threading the double flare fitting into the bubble flare port, I just wasn't comfortable doing it. I decided to swap in some -3AN stainless braided brake lines rather than use the stock hardlines. This allowed me to use mismatched fittings on each end of the line to adapt to the double and bubble flares on opposite ends. It ended up working really well, and I'm pretty happy with how it looks also. Hands down, the 3G master and ABS delete do wonders to tidy up the engine bay. After I got everything bled, the 3G master worked great. There is a slight improvement in pedal feel. Nothing ground breaking IMO, but a bit better than stock overall. Here are the parts required for the swap:

-3AN x 10mm x 1.0 to bubble flare
-3AN x 10mm x 1.0 to inverted flare
20" -3AN Straight to 90°
14" -3AN Straight to Straight



You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.


If you guys have any questions about the swap, feel free to shoot me a PM.
 
Last edited:
I'm wondering if using the ss hoses if your getting more flex than the stock hard lines. Those lines are hard as hell and probably don't balloon out under hard braking. I know that upgrading to ss from rubber hoses yields a firmer pedal, but that doesn't mean they don't expand at all, just way less than rubber. Just throwing it out there seeing what you all think.
 
Agreed: nothing can beat SS pipe for flow and stiff-ness. On the other hand, I think that those braided lines wont give a whole bunch either. They look clean, do the job perfectly, much easier and i dont think you would notice a difference. They are very short as well so you have to factor that in. The shorter the line the less an overall effect any "ballooning" would have. Less volume, pretty simple.

I want the 3g booster but not sure if i need it. Ive been tossing the idea around. Big thanks to GstwithPsi for the links on all the hoses/fittings!
 
I was thinking about swapping to a 3g master (the stock 1" turned out to be fine for my setup), & wasn't a huge fan of SS braided lines either. I know classictube.com bends custom lines, think basically send them in a template & they'll make them for you, also do SS as well. If I ever go 3g master, this is probably the route I'd take.
 
If there is any "balloon" effect, it's negligible if it even exists at all. The cheap $hit I linked to from Jegs is rated at 3k PSI max operating pressure; far over what a DSM brake system will ever see. A real hydraulic shop could probably make you an even better set of hoses. If you wanted to use hard lines, you would have to get them custom made by someone like the vendor mentioned above, who can retrofit the proper bubble flares required. I'm going to make the assumption that route wouldn't be cheap, and I seriously doubt anything in the realm of brake performance would be gained in doing so.

The other benefit to using flexible lines is they allow you to modify your setup, and easily work in that area of the car. One of the things you need that area for is inserting the timing tensioner compression tool. If you had a hard line routed there, it would be a pain. You may be able to route the lines out of the way, but it wouldn't be easy for someone to replicate in a brake line shop. Hard lines just seem like a lot of hassle for no measurable benefit IMO.
 
I think I may take this a step further and replace the hard lines to the front brakes as well. I know the STM ABS delete kit replaces the front brake hard lines with all SS. Would anyone happen to know the lengths for the fronts?
 
I think I may take this a step further and replace the hard lines to the front brakes as well. I know the STM ABS delete kit replaces the front brake hard lines with all SS. Would anyone happen to know the lengths for the fronts?

I just pulled some non-ABS hardlines from a junkyard and have them laying around. I estimate the line going from the passenger side flex line to the proportioning valve is 28" and to the driver side is 42". I say estimate because the lines still have the bends in them but that should be pretty accurate.
 
^ Thank you! I have read that the STM lines are super long, so wanted to get close to stock.
 
I've been debating how to tackle the 3G master cylinder port mismatch issue. Despite others simply threading the double flare fitting into the bubble flare port, I just wasn't comfortable doing it. I decided to swap in some -3AN stainless braided brake lines rather than use the stock hardlines. This allowed me to use mismatched fittings on each end of the line to adapt to the double and bubble flares on opposite ends. It ended up working really well, and I'm pretty happy with how it looks also. Hands down, the 3G master and ABS delete do wonders to tidy up the engine bay. After I got everything bled, the 3G master worked great. There is a slight improvement in pedal feel. Nothing ground breaking IMO, but a bit better than stock overall. Here are the parts required for the swap:

-3AN x 10mm x 1.0 to bubble flare
-3AN x 10mm x 1.0 to inverted flare
20" -3AN Straight to 90°
14" -3AN Straight to Straight



You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.


If you guys have any questions about the swap, feel free to shoot me a PM.
This is basically the route I went with (new braided lines mismatched ends) but i still have my ABS. Did you install your MC dry and then bleed it or did you bench bleed the MC first?
 
I was able to install it dry. I say dry, but it was a used part so it had fluid in it at one point prior to me installing it . If it were new out of the box, I probably would have bench bled it first.

The cool thing about using the flexible lines is they would allow you to easily bench bleed the system. Just loop the lines into the reservoir and "bench" bleed it on the car. It would take a helper, but would be fairly simple compared to dealing with hard lines.
 
I was able to install it dry. I say dry, but it was a used part so it had fluid in it at one point prior to me installing it . If it were new out of the box, I probably would have bench bled it first.

The cool thing about using the flexible lines is they would allow you to easily bench bleed the system. Just loop the lines into the reservoir and "bench" bleed it on the car. It would take a helper, but would be fairly simple compared to dealing with hard lines.
Thanks i guess that is what I will do. it was a pain in the ass though getting it into the ABS unit. so much crap in the way.

I may just take the ends off of the MC and gravity bleed the MC if possible but i will certainly come up with something. thanks!
 
Np. Honestly, I'd try and delete the ABS if at all possible. It's pretty much worthless anyways.

I have a TON of brake line in the garage from a couple ABS deletes. It would work great to make some custom loops to bench bleed the master while on the car. If you want a few of the lines to hack up, you can have them for free, just pay shipping. PM me if that's something you're interested in.
 
Np. Honestly, I'd try and delete the ABS if at all possible. It's pretty much worthless anyways.

I have a TON of brake line in the garage from a couple ABS deletes. It would work great to make some custom loops to bench bleed the master while on the car. If you want a few of the lines to hack up, you can have them for free, just pay shipping. PM me if that's something you're interested in.
The only issue is those lines will not screw into my 3g MC for me to bench bleed it unfortunately.
 
I've read through the pages and I just want to make sure as one member mentioned it on this thread... It doesnt matter if its a 4 cylinder or a 6 cylinder from a 3g for the bb/bmc combo as long as its off a 3g ? Im looking to do the upgrade soon and just doing my research :)
 
I've read through the pages and I just want to make sure as one member mentioned it on this thread... It doesnt matter if its a 4 cylinder or a 6 cylinder from a 3g for the bb/bmc combo as long as its off a 3g ? Im looking to do the upgrade soon and just doing my research :)
That is correct!! Same goes with the newer Galants has the same MC 4 and 6 cylinder.[DOUBLEPOST=1416065221][/DOUBLEPOST]
I was able to install it dry. I say dry, but it was a used part so it had fluid in it at one point prior to me installing it . If it were new out of the box, I probably would have bench bled it first.

The cool thing about using the flexible lines is they would allow you to easily bench bleed the system. Just loop the lines into the reservoir and "bench" bleed it on the car. It would take a helper, but would be fairly simple compared to dealing with hard lines.
Wow installed my MC dry, filled it up,bled all the brakes and all works like a charm. Nice stiff brake pedal. Definitely great when you have two people bleeding the system.Did not have to worry about bench bleeding it. Thank goodness!!
 
Just wanted to update this as I will be picking this up. Looks like JNZ now offers a kit that would replace/upgrade the front brake lines along with the lines from the proportioning valve to master cylinder.
http://www.jnztuning.com/product_info.php?products_id=4073

You can select the 3g MC to get the proper adapters. This will help me out a lot since I decided to be stubborn and do my ABS delete with my motor still in :p.
 
Yes, JNZ does - I posted that a while back ? Regardless, I have used two of their kits, one ABS kit and one non-ABS kit - they both fit and work perfectly. Well worth it, the kits solve all the mismatched flare problems.
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top