jimc62k7

Hello,

Does any company make either type of rotor?

Thanks

peter pan

not08crmanymore

There are plenty of companies that make slotted rotors and/or non slotted.They do not label them as Z51 however.They may say they are the correct size for Z51 equipped cars,but that's about it.

Wayne O

When someone says "Z51 rotors" I think of cross-drilled rotors. If you don't want cross-drilled rotors you can undoubtedly find solid or solid/slotted rotors in the proper sizes to replace the OEM (Z51 cross-drilled) rotors. I'd recommend solid/slotted rotors. Doug Rippie Motorsports is always a good source for OEM and OEM replacement brake parts...you might check with Randy at DRM.

TommyV

DBA makes both in one and two piece. Here is the slotted two piece 5000.



and rear one piece.

Ridgerunner 7.62

BackInBlack05

Holy necro.

Try knsbrakes.com

TCW

True. But Z51 rotors also mean that the caliper brackets are different than base car brackets since the Z51 rotors are a bit larger than OEM base car rotors. That being said, just any C6 rotor won't be correct on a Z51 optioned car.

Hope that makes sense.

Tom

TCW

True. But Z51 rotors have caliper mounting brackets that are different than base car brackets since the Z51 rotors are a bit larger than OEM base car rotors. That being said, just any C6 rotor won't be correct on a Z51 optioned car.

I'd have to say that if an advertised rotor doesn't say Z51 it's for a base car.

Tom

HOXXOH

There's no such thing as "Z51" rotors. There are JL9 rotors, used on base cars and there are J55 rotors, used on base cars with the Z51 or F55 options or as a standalone option called heavy-duty brakes.
However, this thread is more than six years old, so don't hold your breath waiting for a reply.

PDsVettes

Got this from BEZ06 on another thread.

"Unless somebody has changed the brakes on the car, then your base non Z51 has the JL9 brakes. If you have the OE rotors, they are solid.

The J55 brakes are on the Z51 and later model year F55's, and the OE rotors are drilled on those cars.

The J56 brakes are the Z06 and GS brakes.

The J57 is the carbon ceramic brake package on the ZR1 and Z07 Z06.

If you don't have your car you can't measure the rotors until you get it back, but when you measure the diameter you can tell what you've got:

• JL9 - Front 325mm/12.8"; Rear 305mm/12"
  
• J55 - Front 340mm/13.4"; Rear 330mm/13"
  
• J56 - Front 355mm/14"; Rear 340mm/13.4"
  
• J57 - Front 394mm/15.5"; Rear 380mm/15"

As far as getting new calipers, the front calipers are exactly the same for both the JL9 and J55. The rear calipers of the J55 on a Z51 have slightly smaller pistons than a rear JL9 caliper in order to maintain the correct front/rear bias with the slightly larger rotors of the Z51.

In actuality, it really doesn't matter which caliper you run on the rear, especially if you're not tracking the car. The EBCM and BPMV have what's called DRP (Dynamic Rear Proportioning) on the earlier C6's, and in about 2009 they changed from a Delphi ABS to a Bosch system and started calling it EBD (Electronic Brake Distribution). In either case, the ABS system's EBCM will take care of front/rear bias for you regardless of which rear caliper you mount on the rear.

The JL9 and J55 calipers are the same size (except for the rear pistons) and will bolt right onto your brackets/suspension members. If you want put the larger Z51 rotors on your car, you'll just need to get the Z51 brackets that will position the calipers out to fit over the larger diameter rotors.

So.....if your rotors are OE and they are solid - you've got JL9 brakes."

TCW

Whatever. Fact is that there ARE two different sized rotors for the C6 and they are not interchangeable unless you change the caliper mounting brackets.

Tom

HOXXOH

But, I was just identifying the fact that the J55 rotors, and by association the braking system, were found on more cars than those with the Z51 option and they were all on base cars. When you said "I'd have to say that if an advertised rotor doesn't say Z51 it's for a base car.", someone with a '07-'13 F55 option or a '05-'13 HD Brake option on their base car. Can you imagine the guy who walks in an Autozone store looking for your Z51 rotors for his '12 F55 optioned car, because it has drilled rotors or the guy with a '08 F55 car who's told the drilled rotors only fit the Z51 options. Just look at their website and see the confusion going on there.

I did fail to note that the six year old thread was aimed at Ridgerunner's post. Oops! Although you also replied to Wayne O's old post.

TCW

I stand corrected! I thought that the Z51 performance package was the only way to get the larger drilled rotors from the factory.

Even though this is an old thread, it was educational to some of us.

Tom

///DarkSide\\\

Contact LG Motorsports. They'll guide you in the right direction.