R32 Nissan rear brake caliper

[Screamn_Sleeka]

Basic dimensions are 70x35mm, they look really small, smaller than single piston rears (MA70 ect), but they work well so dont question it.

Ops, forgot to get piston size - dont want to get my hands dirty again, will do it later if no one else does.

[CrUZida]

The nonGTR pad is a bit smaller.

[CrUZida]

GTR Pad

[The Real Roadrunner]

I know the surface area of the piston is 25% less than the an MA61 rear caliper.

is that taking into account that the skyline runs 2 pistons?
i havnt measured myself just a query.
cheers
linden

[CrUZida]

2 piston fixed is the same as one piston sliding.

[CrUZida]

Posted by me, in another thread

Just measured the rear calipers (MA61 vs Z32)

Z32 - 38mm piston - 1134mm2 surface area
MA61 - 42.8mm piston - 1439mm2 surface area

So MA61 piston has 27% more surface area than the Z32.

[The Real Roadrunner]

2 piston fixed is the same as one piston sliding.

but you have double the surface area for the fluid to push against.
therefore it should be 2268mm2 and thats why they have more braking force/ability.
cheers
linden

[30psi 4agte]

Cheers for the help again guys!
CrUZida : I need to spread the love before giving it to you again...

Well the wilwood calipers i have , have a pad dimention of 47 x 41mm ........ So they are pretty small pads but the caliper is billet and has 44mm pistons in it.
So im wondering if the piston size will provide better stopping performance even though the pad itself is smaller ?

Anyone have any theorys behind clamping pressure/ piston size vs pad surface area ?
IE which caliper do you think would be better ? The R32 with its larger pad surface area of the wilwood caliper with a smaller pad area but larger pistons / clamping force ???


Here is a link to the caliper and its measurements.

http://www.wilwood.com/pdf/fl197.pdf

[30psi 4agte]

The nonGTR pad is a bit smaller.

Is this the measurements for the pad area or the backing plate area ??

[CrUZida]

but you have double the surface area for the fluid to push against.
therefore it should be 2268mm2 and thats why they have more braking force/ability.

With the single piston, as the piston moves in one direction, the caliper moves in the opposite direction, so you are still getting the same amount of surface area for the fluid to push on.

The main benefits are less weight, less flex, and more even application of pressure.

[CrUZida]

Is this the measurements for the pad area or the backing plate area ??

Measurements are for the outside of the backing plate IIRC.

[SHEPPO3930]

So, rather than start a new thread i thought i'd resurrect this old one.

Does anyone have the original pics that no longer display in this thread? I need the distance from the center of the caliper (between the pads) to the mounting face, so i can work out the offset for my caliper adapter. The issue i have is i don't have the calipers near me at the moment to take this measurement.

Thanks,
Dave

[Pagie84a]

You run hilux diff with ma70 rotors sheppo? Im whippin diff out in couple weeks I can trace one scan it and send it to you

[SHEPPO3930]

Nah putting them on a volvo diff with mx73 discs. Just need to knock up some adaptor plates on the weekend.