CT4 brake pads - 2 part numbers

[Dalyons03]

GM has two part numbers for CT4. I don’t know what the difference is between them and does it matter which one I pick? Only one is available at the moment.

85115921
Fits your vehicle

85528936

 

[Kawman]

Interesting! It looks to me like 85528936 is the original part and 85115921 is perhaps a longer wearing alternative. The only difference between the two pads appears to be that 85528939 has 9.15mm of friction material and weigh 7.14 lbs, while 85115921 have 13.65mm of friction material and weigh 9.01 lbs.

 

[Dalyons03]

Installing 921, let’s see how they perform

 

[schernov]

85115921 Is the factory pad without Chamfers.

85528936 Is low noise version with Chamfers.