I don't know how much good it will do you. It's a Canadian site, but anyways...... https://ca.autoshack.com/

 

FYI GM makes a cast iron rotor for the HHRs. The one that comes stock is a composite rotor and that is the one that warps easy. This is from a dealer, these reduce the tendency to warp, about 6 months ago I had the cast iron rotors installed and so far no sign of warping after having been through winter. We will see.
Ron

 

My 2LT Panel came with the larger (non-Brembo) discs.. Those with the regular calipers that have a bigger piston than SS makes nice combo..

 

Was that done by the factory or someone added them?

 

I couldn’t find different part numbers for later panels for rotors or the calliper brackets.
I wonder if your ball joint stubs are 20.5 mm , like a non Brembo SS

 

I'm not absolutely sure, I got it 1 year old, from original owner. But almost no miles.

So, it is what it is.

 

Sleeper, take a photo of your RPO codes in the glove box, and let’s see what your brakes code is.

JM4 would be the ABS 10.86 inch cast iron rotors
JL9 would be from the SS non Brembo 11.6 inch rotors, and rear axle disc brakes
I went thru all the listed rotors and calliper brackets, at the RockAuto site ,all for 2011 HHR, they all pertain to the 10.86 diameter rotors.

 

Blue- I have the Build Sheet ChevyMgr sent to me long ago. It lists the JM4 (4 wheel anti-lock brake system).

So the original owner musta did the swap, cause I do have the SS 11.6" rotors, I checked that way back when I painted the calipers etc.

All these years I just assumed mine came stock with SS rotors.. the Code doesn't list any size, but if I needed parts I would have learned the hard way..

 

How do I do that?

 

Read your owners manual, & a torque wrench is best for proper tightening to spec.