NX2000 Brake Master Cylinder on KN13

[mdb4879]

Sorry for posting this in here, but I haven't gotten any luck anywhere else. Plus there are a few active FWD guys in here so hopefully I can get some help. Here's my post copied from elsewhere:

Hey everyone, so I've got a question. I just put NX2000 front brakes on my KN13 (1987 Pulsar NX SE). The caliper pistons are noticeably larger than stock and I wasn't sure if it would be a problem, but it seems like it is. My brakes feel too soft for my taste. They don't require enough pedal effort and the pedal travel is too long. I noticed my master cylinder has a 13/16" bore and the NX2000 master cylinder has a 7/8" bore. I figure the larger master cylinder should remedy the issue. So my question is, is the NX2000 brake master cylinder a direct replacement for my stock one? Are all the brake lines in the same place so will they line up without issue or modification? Thanks in advance guys.

I did get one response on nissanexa about adjusting the rod, but that's not the problem. Here's my response to that:

The rod doesn't need any adjustment. They start to grab exactly where they should. I mean from the time they start to grab to where they'll lock up is too long of a stroke. I guess for most this extra "resolution" would aid in brake control. But for me I can already tell it'll be a hinderance because it'll be too difficult to heel-toe due to the extra brake pedal travel.

[boost_boy]

Yes! The NX2000's brake booster is a direct replacement of your stock unit. MY combo works just fine.

[mdb4879]

Do you mean the booster or the master cylinder? Or do they both interchange? My question was pertaining to the master cylinder specifically.

[boost_boy]

I meant brake booster. I just used the B12's master cylinder and my brakes will literally toss you through the windshield. So NX2000's booster with the B12's master cylinder and the car will stop just fine and on all 4s. All the brake lines for the NX2000's master cylinder is not in the correct spot and it will create a hassle for you if you want to use everything from the NX. Just use the booster from the NX2K and retain your stock or new stock B12 master cylinder and you'll be just fine.

[Liquid_Neon]

I got nx2k fronts and I never changed my booster. Make sure the rears are adjusted correctly (droms affect travel big time) and be double sure you got the air bled all out.
Frankly if there is one thing you should swap is the brake hoses, I popped a line recently and changed them with nx2k ones (direct bolt in). much better feel if you havent changed them recently, they get soft and spongy with age

also on a side note; I found out that if you want sportback gas lifts, buy them from a 91-95 dodge caravan endgate. I dont know if you have one mdb, but in case you do...

[mdb4879]

The rears are adjusted just fine. Like I said, they begin grabbing exactly where they should. I just have to push the pedal a greater distance to get the same stopping power. I'm going to try bleeding them again since I did only gravity bleed them. I haven't gotten to drive it around really because to the rod knock (hopefully getting that fixed in the next month or two).

I have heard that good brake lines give for a stiffer feel because they don't expand much. I'd like to get Stainless lines, but I'm too lazy to search for them right now since I'm not serious about buying them yet, lol.

Dee, I just did a quick search and the B12 and N13 Master cylinders are the same, and mine's great so I'm good there. Maybe it is just a tiny bit of air in the lines. Anyways, I'm actually not looking to have my brakes throw me through the windshield (that is if you mean they're sensitive by saying that). Of course I want them to have that kind of stopping power, but I like the slightly heavy pedal effort they require stock. When I put that clutch in my friend's 2006 Civic Si I drove it around a couple days to make sure the clutch was broken in properly. One of my three big complaints about the car was that the power brakes were overwhelming. Under normal driving I got use to it, but under sporting conditions they were terrible. I couldn't heel-toe at all because they were so sensitive that every little bit of fluctuation in pedal effort from hitting the gas pushed the brake further or let off it and made the car jerk. My Pulsars have always been much stiffer and easier to modulate and brake steadily when down shifting.

Anyways, enough rambling about my preferences. This probably doesn't apply to the brake booster, but as for other parts of the braking system, when I order something for an NX2000 should it be for the ABS or non-ABS model? Or does it matter?

[float_6969]

Make sure the air is bled out. If there is even a little bit of air in the lines, it will make a big difference. If you're still not happy with it, definitely go for the SS lines. They make a BIG difference to pedal feel. If you're STILL not happy, then look into a larger bore BMC to match the increased piston diameter. I'd be willing to bet a good bleed on SS lines will be pretty close to what you want.