I've noticed that there are 26mm and 30mm(ztt) calipers.

I'm trying to figure out which calipers I have and am unsure which model 300z they came from. Is the measurment mentioned above the size of the piston? (so I could just measure it)

I need to know so I order the correct rotors!

Are there any other markings that would inform me as to which calipers I have?

TIA,
Jody

There are 2 types of TTZ brakes. One set is made of aluminum, Im not sure from what years they were made. Then the other type is steel, Ive been told the aluminum is better for obvious reasons, but both types will still work.

this (http://www.princeton.edu/~asad/zbrakes/) should answer all your questions

Thanks, that did help.

Unfortunately, the idiot that sold them to me (Dustin Buell, aka aztecb13ser, drivenprimer@yahoo.com; from Vancouber, WA) gave me one of each...Al 26mm & Al 30mm...telling me they came off his friend's 300z.

Of course he hasn't posted in a while...wonder why.

Thanks for the info.
Jody

damn that sucks to hear man. another forum member screwing over people.

best bet is to go to autozone and buy from there already rebuilt for 50 bucks after core charge. and they are genuine nissan calipers. thats how much i paid for mine

Originally posted by JayLew
There are 2 types of TTZ brakes. One set is made of aluminum, Im not sure from what years they were made. Then the other type is steel, Ive been told the aluminum is better for obvious reasons, but both types will still work.

Aluminum calipers are lighter than the iron ones, but rotors are prone to warping under heavy braking. On a car as heavy as the Z, the cast iron were better, but on lighter cars, aluminum might suffice.

Michael.

...rotors are prone to warping under heavy braking...
This would only be true if your wheel lugs were improperly torqued.

I don't understand how aluminum calipers would cause warping over iron calipers. I've noticed that poor brakes will warp under hard braking because of a drastic change in temperature. Proper brake pads and aluminum calipers should help bleed off heat in order to help prevent warping.

Remember, good brakes are all about dissipating heat. That is the bottom line. Aluminum will help control the heat much better than the iron calipers that will not let go of the heat.

-Alex, the brake theory guru.

The calipers will not have be the source of warping as the prior post eluded to. Excessive heating of the rotors alone will not usually cause warping, but improper torqueing of wheel lugs will exert undo pressure on those points ultimately resulting in warped rotors.

GamblerZ:

Are you referring to my post when you say prior post? Calipers "can" indirectly cause warping simply due to rapid temp changes. Yes, you are very correct on proper lug torque.

My example of iron vs. aluminum calipers is a very far stretch in heat transfer discussions. I merely pointed out that aluminum would do better, but the pad is the key in almost every situation.

I'm getting a bit off the point....

-Alex