I just finish doing the whole brake service on my wife's 2010 TL (CPO car) with new rotors/pads/hardware/fluid for the front and rear.

I bought a kit from RockAuto, the Power Stop Performance Brake Upgrade kit, with comes with everything including brake pads, new caliper hardware/clips, etc..

I finished doing the front, and when I went to the replace the rear rotors, I found to my surprise that the rear rotors in the kit do not fit my wife's car:



obviously the bolt pattern is not correct for my car:



Here is the original/OEM rear rotor:



And here next to each other:



So I carefully measure the bolt pattern in the rear of the car, and it comes to about 4.5", which matches the 5x114.3 mm some Acura's have:








If I check that bolt pattern with the rear replacement rotors that I got, I find that (as I noted above since they don't fit), it is different:






If I open up the caliper until I approximate the actual bolt pattern on the replacement rotors, it comes to about 4.75" inches approximately, which matches the 5x120 mm that some Acura cars have:






Per what I can find out, I expected the rear bolt pattern to be 5x120mm, not 5x114.3mm. What is going on? Anyone else has that happen in their cars?


Will

 

Ah, and of course, I should have mentioned, the bolt pattern on front is also 4.5", since I have rotated tires front <-> back for 2 years now every 4-5K miles. So both the front and rear bolt pattern is 5x114.3mm.

So the kit I got had front rotors what where 5x114.3mm and rear rotors that were 5x120mm.

I just need replacement rear rotors with the 5x114.3mm so that I can complete the brake job.

Thanks much,
Will