Last week the brakes on my XC90 started to squeal and grind something awful, which told me that the shop that did the inspection didn’t take a good look at the pads and the dealer who sold me it didn’t put new brakes on it before the sale. No biggie, though, I can get new rotors and pads and learn this new-to-me setup. It’s got disc brakes on all four corners, how much harder than on the Miata can they be? *ominous noises*
First stop, RockAuto. They show three different front rotor sizes for my car, a 3.2 AWD: 316 mm, 328 mm, and 336 mm. Well, shit, how do I know which one I have? Check FCP Euro, IPD, Amazon: same story. More digging, this time in forums, where the consensus says to pull the wheel and measure directly, or pour chicken blood on a Ouija board and hope for an answer. Thanks! So I raised the front passenger corner and measured with my trusty measuring tape 13 inches across, so 330 mm. It’s closer to 328 than 336, right? Right, so muzzle-load the parts cannon and light the fuze. *louder ominous noises*
Most parts arrived on Wednesday but I didn’t have time until today to dick around with it. So I dutifully started to remove the caliper and wonder how to remove the anti-rattle clip, which came off after a little bit of futzing and some edumacations from the interwebtubes. But wait, what’s this in the video I’m watching? Oh. Oh no.
Coño, did I order the wrong size? I pressed on, pressed the caliper piston in, removed the bracket, pulled the rotor, and sat it on top one of the new ones. It’s larger than the new one. And the pads are completely different too. HIJUEPUTA.
Now I get to test RockAuto’s RMA process to return the front rotors, pads, and hardware and order new ones. At least the rear brakes don’t differ, so I can work on those while waiting for the rectification to my mistake to arrive.