Afternoon,
I feel like this is a horse that's been beaten to death by the looks of my searching. There was a page that I've seen but forgot to bookmark, and can't find anymore.

I have a 95 S Del Sol, my 13/16" master cylinder started leaking so I replaced it and the brake booster with a 15/16" version. Just like everyone else, I found that the one of the M10 flare nuts wouldn't work with the new M12 port. Much to my frustration, this brake line is no longer made and finding an inverted M12 3/16" flare nut, or a M12x1 to M10x1 brake line has proven difficult, or very expensive.

At this point, I'd like to just go to a junkyard and find an appropriate OEM brake line but I'd like to know if anything other than a Del Sol Si has the M12 brake line fitting and he same general pipe routing, so I don't have to splice anything. I know other cars came with the 15/16" master cylinder, but some are ABS (not sure if that affects the pipe routing, haven't seen anything for or against that yet), but I want to make sure I get a list of cars that came with it so I can go to the junkyards with the correct cars versus wasting my time checking each one I find. The junk yards around me that have a bunch of civics are about an hour away, so I don't want to make the trip on an assumption.

Most of the sites with material regarding brakes revolves around swapping drums to calipers, which is close but doesn't cover the hard lines as much as I need. The page I can't find again I remember listed the S and SI as having 15/16" MC, which is correct for the Canada market I think, but not for the US market.

Cliff Notes: What cars came with the same 15/16 M12 brake master cylinder/proportioning valve location so I can pull it and get a direct fit into my Del Sol S with a new 15/16" master cylinder swapped in.

 

Why not just get a replacement 13/16" master cylinder? Seems much easier.

I doubt that a you'll find a similar piping routing, but with the M12 nut. That brake pipe routing is almost always exclusive to the chassis.

 

Because I didn't expect this to be such a clusterfuck, I tossed my old brake booster when I installed the new one to fit the new 15/16 MC. The original M10 line was also damaged upon removal. To go back to the original setup, I'd have to buy a new MC, BB, and the oem M10 line.

Basically it's a big mess right now and I'm so frustrated that honda decided to up the port flare nut size because almost no one carries an M12 inverted nut, let alone at a reasonable price. Adapters for M10->M12 are all bubble ends, so they'd have to be machined down to work so it creates more issues.

I need to know if Civics that came with the 15/16 size MC have the same routing as the Del Sol, since they're about the same car.

 

Go to a junkyard and grab the nuts you need.

Cut the brake line and reflare it with the proper nut on it. Too easy.

 

Yeah, that's partly what I'm asking - what cars came with this size nut/line.

I can't buy an M12x1 inverted flare nut from the parts store, they're all bubble and don't seal well, my custom brake line (double flared) leaks with the nuts I bought.

There are individual nuts for sale on eBay, but they're about 20$ a piece.

 

Someone correct me if I'm wrong, but pretty sure teggys came with the 15/16 MC.

 

Due to the larger required brake booster and the positioning of the larger M12 port on the master cylinder, the brake line hits the shock tower when installed.

In order to use a machined M12-M10 adapter I made (it was bubble, now it's inverted), I need a right angle inverted M10 coupling now to divert the brake line away from the shock tower. I can't find one of those either.

The double flaring tool I have, as well as my dad's, always produce off-center flares so I'm unable to make flares that are usable either, so I'm having to resort to using preflared piping from places like AutoZone. I'm guessing the brake line I bought is trash, I'm weary of buying more brake line or another tool because it's such a hassle waiting for things to ship.

Edit: I think I might just go back to stock... but I'll have to buy a new original brake booster because I tossed my old one when installing the new one... and I'll still have to get a new brake line - which aren't made anymore.
God this is such a mess.

 

'94 - '97 Integra RS Master cylinder/brake booster combo will line up perfectly to the original non ABS Civic/Del Sol brake lines. I know this works because I've personally installed this setup at least 3 times in different '92 - '95 Civics. Be careful when selecting your brake booster, ABS and non ABS use different brake boosters and even though the mounting studs for the MC are in the correct location they aren't interchangeable. I found this out the hard way.

You can also use a master cylinder from a '90 - '91 Civic EX sedan, which is 15/16s, with the original brake booster that came mated to the 13/16s MC.

A word of caution, a larger master cylinder without upgrading to larger front calipers will give you a very hard brake pedal with very little travel.

 

The 94/97 integra, and 90/91 civic ex sedan is 15/16 and has two M10x1 ports?
The brake booster I bought, and currently have installed, is this: Cardone 53-2510

If this is the case, I appreciate your response a great deal. I currently have a mashup of adapters and it's working, but I'd rather have a non-adapter setup.

 

It looks like the Civic EX Sedan uses the opposide brake booster bolt pattern (which is the same as my stock booster, but I threw that one away when I bought the larger one that had the correct bolt pattern as my 15/16 MC)

The Integra MC looks (picture looks like) it has two M10x1 ports and the same bolt pattern as my larger brake booster.

I just need to find out if the integra is 13/16, 7/8, or 15/16 (0.8125" - 0.875" - 0.9375") Looking at Cardone's website, the re-manufactured one states it's 15/16, but the new one doesn't have a stamp on it.

Thanks though. This is exactly what I was looking for. You saved me a lot of buying, testing out, returning, and frustration.

Much appreciated!

 

Correct.

According to the fitment notes it's an RS, Non ABS brake booster, which is the one you want.



That's correct. It's an easy way to get a 15/16s MC without having to buy a new brake booster and crawl under the dash. I knew you had already thrown away your old booster, but I figured I'd throw that option in there anywhere since it may help out someone else reading this thread.

Exactly.

All '94 - '97 Integras use a 15/16ths MC except GSR and Type R which are 1". Only the RS model is non ABS though, and it's the only one to use two M10x1 ports in the correct positions to use the stock brake lines.

You're welcome

 

New integra MC in, fashioned up a new M10 line, no leaks. All is well.

I've seen so many posts about people in my situation who ran into the M12/M10 MC situation, and I don't recall ever seeing one that had the integra linked within the first few post/pages. It cost me a little more than I'd like, but it's back in spec and leak free.

Could have done it for 50$ versus 275$, but that's the way it goes some times.

Thanks again.