I've discovered that both sides on the rear of my '05 MCS Convertible are missing the brake rotor to wheel hub retaining bolt. I'm hoping this is the cause of an annoying intermittent squeal I've noticed from the rear of the car, most often while rounding sweeping curves (as opposed to hard/sharp turns).

I've also discovered that the holes in the rotors don't line up with the holes in the hub! With the rotor lined up with the threads for the wheel bolts, there is no hole for the retaining bolt. And vice versa - with the retaining bolt hole lined up with the corresponding threaded hole on the hub, there are no holes for the wheel bolts.

I considered swapping the rotors side-to-side, but a tracing/rub of the driver side rotor laid atop the passenger rotor shows I'd still have the same problem.

Do I have the wrong rotors, put on by some careless/clueless/sloppy shop (or the used car dealership I recently bought the car from)? Parts diagrams I've found online show the retaining bolt hole clockwise relative to the closest wheel bolt hole, while on mine (see attached photo), the retaining bolt hole is counter-clockwise relative to the closest wheel bolt hole.

Thinking it through more as I've written this post, I think this is probably the case. If anyone out there can confirm that, or correct me and point me in the right direction, I'd greatly appreciate it.

aTdHvAaNnKcSe

regards,

Zach

 

That photo shows one of 4 places it might work. I am assuming you have turned it all the way around 360 degrees.

One of mine has snapped off, it does nothing except make it easier to get the tire on. If indeed, after checking all four positions you can't find the proper placement, just note the position of one hole, and with a bolt in hand, line up and put the wheel on with the bolt ready. Not too much harder than normal, but if you don't get it easily, stop and try again. Put a hole exactly at 12 o'clock so you can do it easily.

 

The purpose of the bolt is pretty much just to hold the rotor onto the hub until the wheel's installed. Having it broken or missing isn't going to cause your squeal. If you were getting enough motion between the rotor and hub to cause a squeal, you'd have bigger problems (like broken lug bolts).

Do you have an aftermarket sway bar in the rear? Could it need lubricated?

 

I want to add I had my tire off and you are correct, my 5th hole is to the right of the pattern. I have no idea what the disc goes to , but if that is the only thing, it should be fine.

 

There is no need for that bolt. For your squealing, resurface rotors & sand down your pads. Also, add anti-seize to the back of the pad, behind the shim.