Datsun Roadster Forum-311s.org

Hi there,

I am about to do the Volvo caliper conversion and am a little confused about how much needs to be ground off the the rotor diameter. None of the numbers in the Brakes section on the main site add up for me:

"You will need to have a minimum of 1/8" machined from the diameter of the roadster rotor to provide clearance for the new calipers ... Stock rotors are 11.18 inches in diameter. So for all practical purposes you want rotor diameters of 11.1175"."

My questions are:

1. Is the 1/8" the total removed from the diameter, or is the total 1/4"?
2. 11.18 - 0.0625 = 11.1175; what is 0.0625"?
3. Can anyone who had clearance issues offer their final diameter?

Sorry for all the questions, but you know what they say about measuring twice, etc.

Best,

Jesse.

Taking an eight of an inch all the way around is 1/4" from the diameter. So have them machine 1/8th of an inch off of the rotor and you will be good to go with no clearance issues. You should be able to go retro if the need arises as well.


Steve

I had some trouble in this department when I machined down my rotors.

After taking down the original recommended amount, I found that the top of the caliper still bound-up with the rotor ( I found that it was necessary to take another ~1/8" off. (Obviously not something that you want to take lightly).

From what I've learned from the membership, I am not the first person to encounter this problem. It appears that there are more than a few aftermarket variations to the calipers that are slightly different, hence the requirement to take a sliver more off.

Obviously the less you take off the better, but I have not encountered any problems with mine whatsoever (annd, get yourself some Porterfield Carbon/Kevlar pads - their Greeeaat!).

Just make sure that whatever you take off the rotor permits that the rotor surface is sufficient for the break pad to completely cover. I understand (thru the membership) that if the pads overhang the rotors, your brakes will chatter and possibly have performanc problems.

Hope this helps.

Dan