Jump to content
SAU Community

Recommended Posts

I'm planning on upgrading the disks on the front of a '06 X-Trail. Currently they are 2-spot floating calipers. I have worked out that the disk diameter is the same as a R32 GTSt, but the current disks are a bit thinner, and slightly "less tall" (back of disk to front of hat). R32 GTSt rotors and 4-spot calipers should simply bolt up.

My question is - will this work, mostly in terms of pedal feel. Will I be able to get enough fluid pressure from the original MBC, or do I need to upgrade that as well.

TIA

Link to comment
https://www.sau.com.au/forums/topic/484516-upgrade-front-brakes-2-to-4-pistons/
Share on other sites

I asse you have also measured how the calliper actually bolts up? Not just making wild assumptions based on disc diameter?

 

 

Just do it and drive it. It will work. If pedal feels spongy get bigger master. If feels too hard and wooden get smaller master.

Is that caliper a 2-pot sliding caliper?

The R3X 4-pots are 40.44mm pistons. So with twice as many of those as a 2 pot, it is equivalent to 57.2mm pistons in a 2-pot.

R3X piston area = 4 x pi x 40.44^2 / 4. And the 4s cancel nicely, so it's just pi x d^2. = 5137.7 mm2

Entrail piston area (assuming 2 pot 44.4mm) = 2 x pi x 44.4^2 / 4 = 3096.6 mm2.

Seems like a substantial change. 165.9%.

BM50 MC over BM44 MC is 113.7%.

Pedal travel might increase a bit.

57 minutes ago, Ben C34 said:

I asse you have also measured how the calliper actually bolts up? Not just making wild assumptions based on disc diameter?

 

X-Trail is 28mm thickness (GTSt is 30mm), hat height is 49mm (GTSt is 54mm), mounting location is same spacing as GTSt, (although there is a possibility that the ears may be different ).

My problem now is that I used to have a set of R32 calipers, which I gave away after I upgraded to GT-R rotors / calipers on the front on my GTS4. Now, if you get change from $500 for a second hand set, you are doing well.

  • 1 month later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • The real question is, on some of those wild roads they call highways, how many times did a farmer in an old ute from the early 2000s blaze past you over double lines?   Tassie is a wild and really cool place, and after doing a work related road trip there January of 24, I understand why Targa Tasmania is ran there, and is so tough to do well at! We had a brand new Camry Hybrid that handled quite nicely, and thankfully weren't in an old car, because cresting some of those hills in a 100kmh zone for it to suddenly be like "surprise f**kers, this is a recommended 30kmh hard right turn" wouldn't be pretty. We weren't racing the Camry around, but we weren't slouching in the bends either. But my lord those old farmers know their old clapped out utes, and those roads, as they were absolutely hammering it!   You're also super lucky to make it up to Mt Wellingtong this time of year. It's often road closed with snow/ice! Also, I hope you hit up Salamander Road in Hobart for some insanely good food (I highly recommend the dimly lit Irish pub for a Guiness Pie, or even the bangers and mash!!!)   How long did the Ferry take to get across? I want to do a road trip of Tas on my own time, but I get horrifically sea sick, and I don't want me on the Ferry, just the car 😛
    • So far so good, about 30km on it so far and nothing out of sorts yet thankfully
    • Look at @Kinkstaah's thread on the issue.
    • Hmm not really, I'd say its race car life or modified car life when you make 3 or 4 times the power Nissan designed the car for lol. 
    • I'll let others with more breakage chime in, but I can't think of anyone who had a problem with the standard centre plate before they had a problem with the standard gears - the plate generally just gets replaced for safety when the gearset is upgraded. As for the gearsets, its not like they are OK at 600Nm and break at 601. Their longevity is a combination of how much torque you are making and how gentle you are on shifts (or not). 
×
×
  • Create New...