Brake Disc Thickness

[tasroadster]

What's the min. thickness for 1990 NA front Disc's ?

What's the thickness of the NA8 front disc's..... are they the same as the NA6 ? They are 255 mm right ?

Any help greatly appreciated.

Thanks

[Inf3ct0R]

na8/nb8a are 255mm, na6 are smaller.
min thickness for the 255mm should be 20mm... i think.

the figure should be casted onto the disc, around the hub area on the inner side

[tasroadster]

So I can use 255mm disc's which are 21 mm thick ?

Thanks

[Inf3ct0R]

yup, I had mine machined down to 19mm

[tasroadster]

So.... what happens if I just run then at 21 mm thick ?

Is there any problems with that ?

Thanks

[Inf3ct0R]

nope, once you hit 20mm, i'd be looking at buying new rotors, they are at a higher risk of cracking/overheating

[tasroadster]

So leave them as is ?

Thanks

[Inf3ct0R]

depends on how hard your driving and what pads your running, but once you get them machined and hit 20mm then replace them..

[tasroadster]

machine them to what thickness?

20.5 mm ?

Thanks

[Craig]

Here's some disk info to assist.

[Inf3ct0R]

the machinist should be machining to whatever thickness is needed for a smooth consistent surface.

[Inf3ct0R]

well, there ya go min thickness 18mm

must have my stock disc @ 17mm or something then LOL

btw, if your disc are 21mm, then they sound brand new!!