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Thread: Brake suggestions?

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Posts: 31-36 of 36
2011-07-29 23:10:40
#31
Yes, bleed the lines where they come out of the MC. Loosen one of the connections, have someone press on the pedal, and tighten the connection before they let the pedal return. Repeat until the air is cleared, then move on to the next connection. Then bleed the lines at the calipers as usual. You can make this easier by "bench bleeding" the MC. Basically, this is filling up the MC before you install it and plugging the flow of fluid with the connector caps that come with a new MC. This can be messy, and, if you have a used MC, you won't have the caps. But it does cut down on the amount of air in the MC that has to be flushed out.

I had to go back a couple times and bleed the MC before I got it right. The pedal was a bit mushy until I did.

Bill
2011-07-30 03:42:14
#32
The NX master cylinder has more rear bias than the B13 Se-r because the small rears need to keep up with the larger fronts.
Same reason the B13 has less rear bias(and PSI of pressure). The fronts are relatively smaller so the rears don't need much bias to do their share of the braking.

If you upgrade an SE-R to NX front brakes, and you want to stay close to factory bias, use the NX master cylinder. The NX proportioning valves also deliver higher PSI to the fronts (and rears) so they allow the NX fronts to reach their braking potential.

Most Altima master cylinders have about the same bias and PSI of pressure as the B13 SE-R. so if you have NX fronts and stock rears, and want a larger MC, you'll still want to swap the NX proportioning valves over to the Altima MC.

Maxima/G20 rear brakes are a whole different story. They are a nice upgrade until you have a high speed panic stop, then you'll find yourself fighting a tail wagging rear biased car, at the worst possible time, no matter which MC you use.

I love my Maxima rears but they are over kill on a B13. NX fronts, Maxima rears, Altima master cylinder with NX proportion valves, and stainless brake lines will stop you quick.
In a high speed panic stop they will stop you quick enough to lock all four wheels and totally ruin all four tires by flat spotting them.
2011-07-30 09:25:21
#33
Originally Posted by NI
The NX master cylinder has more rear bias than the B13 Se-r because the small rears need to keep up with the larger fronts.
Same reason the B13 has less rear bias(and PSI of pressure). The fronts are relatively smaller so the rears don't need much bias to do their share of the braking.

If you upgrade an SE-R to NX front brakes, and you want to stay close to factory bias, use the NX master cylinder. The NX proportioning valves also deliver higher PSI to the fronts (and rears) so they allow the NX fronts to reach their braking potential.

Most Altima master cylinders have about the same bias and PSI of pressure as the B13 SE-R. so if you have NX fronts and stock rears, and want a larger MC, you'll still want to swap the NX proportioning valves over to the Altima MC.

Maxima/G20 rear brakes are a whole different story. They are a nice upgrade until you have a high speed panic stop, then you'll find yourself fighting a tail wagging rear biased car, at the worst possible time, no matter which MC you use.

I love my Maxima rears but they are over kill on a B13. NX fronts, Maxima rears, Altima master cylinder with NX proportion valves, and stainless brake lines will stop you quick.
In a high speed panic stop they will stop you quick enough to lock all four wheels and totally ruin all four tires by flat spotting them.


I didn't know the prop valves were so different. I'm using a 95 altima master cyl, and 94 max rear brakes on my NX. Stops pretty well, but I kept spinning out in the ice we had in atlanta a while back. This was right after the max upgrade, so if I lightly tapped the pedal my rears would lock. Kinda scary, and I know I have summer tires, but before the upgrade it wasn't so bad.
2011-07-30 14:13:09
#34
I have been and remain a large opponent of placing the Altima master cylinder in a car such as ours.

Hawk HPS pads up front, Raybestos rotors up front, Brembo rotors rear with stock OEM pads, techna-fit PVC coated stainless steel brake lines, OEM master cylinder and a brake fluid flush.

I find it amazing how quickly the car can stop now. Night and day difference over stock.

Pedal firmed up a lot
Last edited by Kyle on 2011-07-30 at 14-16-13.
2011-07-30 15:12:10
#35
Having good brake fluid in the car is key to a positive firm brake pedal feel.
2011-07-30 15:55:30
#36
Originally Posted by tswii
I didn't know the prop valves were so different. I'm using a 95 altima master cyl, and 94 max rear brakes on my NX. Stops pretty well, but I kept spinning out in the ice we had in atlanta a while back. This was right after the max upgrade, so if I lightly tapped the pedal my rears would lock. Kinda scary, and I know I have summer tires, but before the upgrade it wasn't so bad.


Yah, Maxima rears can overpower NX fronts. If you are using Altima proportioning valves you've reduced the rear bias but dropped the pressure to your front brakes by about 200 PSI less than Nissan intended.
Ice changes everything, when I move from Florida to N. Idaho I had to learn a whole different driving technique.

Ice/snow are the reason I love my Maxima rears and won't go back to stock.

In winter I use the hand brake constantly(with the button kept pressed in) to modulate my braking. If I hit an icy patch in front of a stop sign and start to slide through, light foot pedal pressure while applying pressure with the hand brake stops the car sooner and straightens the slide. If I start to slide past a turn, because the front tires don't have enough traction to turn the car, pressure on the hand brake alone will line the front with the corner when nothing else will. My daughter got so good at that she used the hand brake instead of the steering wheel to "drift" into our driveway anytime the road was slick enough.
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