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305MM Rotors

Marty Miller

Full Member
Joined
Aug 7, 2020
Messages
13
Location
CARY, NC
I'm buying new rotors for my '02, does anyone know how to determine if you have a 305mm Rotor without taking off the tire and measuring? Does it have to do with whether you have drum or disc rear brakes (I have disc)?
 
All Avalanche and EXT have 4-wheel disc brakes.
 
Front only came in one size I know of.
Rears have 2 options for the 1500 truck and it depends on whether you have 2 piston or 1 piston.

2 piston came with the locker rear end which means Z71 & Z66 option.

So if you go back in this section and maybe maintenance you will find many threads where people explain the difference in more detail.
 
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