Grooved rotors

[Point45]

I used a different caliper to measure the rotors and they turned out to be lower, around 34.6-34.7mm. The first caliper I was using is flat on its measuring surface which was making it difficult to get accurate measurement due to that lip. I bought another one from HF that is indented. The lip is also around 0.5mm per side.

The rears are 25.9mm.

The reason I ask for what these rotors measure new is to figure out how many mm I use up per 5k miles or so. Does anyone know the thickness when these rotors are brand new?

you need a pair of micrometers instead of trying to guess with calipers.

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[Wildcardfox]

If the catalog that I looked at is correct, normal thickness is 34mm, min thickness is 31.6mm , but again, it will be stamped on the rotor on the outside edge.

 

[Point45]

If the catalog that I looked at is correct, normal thickness is 34mm, min thickness is 31.6mm , but again, it will be stamped on the rotor on the outside edge.

if thats the spec something is off, there's no way its still over new spec at 34mm with that lip and 60k miles on them.

You can use a pair of washers to help if you dont have micrometers as the other guy suggested but I would try to borrow a pair of micrometers if you can or just pull the rotors and have a shop measure them.

 

[UnhandledException]

This is the tool I used (or I should say, Pittsburgh/HF replica but its identical) : https://www.amazon.com/OEMTOOLS-253...t=&hvlocphy=9003741&hvtargid=pla-452797331753

I am aware the min thickness is printed on the rotor hat, but after 67,500 miles mine is unreadable. There is no way to clean corrosion off of those hats.

 

[Wildcardfox]

if thats the spec something is off, there's no way its still over new spec at 34mm with that lip and 60k miles on them.

You can use a pair of washers to help if you dont have micrometers as the other guy suggested but I would try to borrow a pair of micrometers if you can or just pull the rotors and have a shop measure them.

I said if the catalog is correct, and it is incorrect for that part number that was a GT front.

here is the official numbers:


Front: 394 mm x 36 mm aluminum hat, floating-type vented discs, Brembo six-piston fixed aluminum calipers 34mm/36mm/38mm pistons

Rear: 380 mm x 26 mm vented discs

 

[NoXiDe]

I only know the minimum for the GT350. Source: on the hat - it's printed.
Front is 34mm minimum
Rear is 24mm minimum

 

[JAJ]

I only know the minimum for the GT350. Source: on the hat - it's printed.
Front is 34mm minimum
Rear is 24mm minimum

Correct - those are the numbers in the service manual as well. It's measured at the thinnest point.

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