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Some have stripped the heads and had to get new ones from the dealer. There are lots of options to replace at the hardware store.
I did some measurements:
The threads are 6mm, 1.0mm thread pitch. the screw is 14mm length overall. The head is 3.5 mm thick, leaving 10.5mm of threads. The drive is #30 torx.
I looked at what was available at the harware store. Lots! There are similar metric screws with the large heads. Some phillips, some hex, some slotted, some stainless etc, some black and some plated. So there are lots of things to choose from.
Someone suggested hex head cap screws. These are very strong and hard. I think that the existing screws are deliberately made soft to allow for these to be drilled out when they are rust bound and stripped beyond salvage. So perhaps the black hex head screws that look like the originals, should not be used. -- too hard --
The web section of the rotor is 5mm thick. The minor ID of the taper is 7.5mm and leaves 1mm of bore that is not tapered out.
My idea of a better solution is to drill out the rotor screw hole to 10mm when the rotor is off for renewal or PM of the P-brake. Then a hex head cap screw can be put into the hub and never removed. It will stand a bit proud of the rotor web when installed, but the wheels have pockets at that location which are 10 to 14mm deep on my snow tire wheels and Aero wheels respectively. The 6mm cap screws have 10mm heads. So to remove the rotor, remove the caliper then just take the rotor off. Never have to remove the cap screw! It becomes an indexing pin. As I have posted before, the screw that comes from the factory seems to have little need to retain the rotor on the hub after vehicle assembly. After that one only needs something there that will index the rotor to the line up the holes.
If installing a substitute screw, if the threads are longer, after installing, while still on the jack(s), release the P-brake and rotate the hub by hand to see if any excess thread length interferes with the drum brake internals. Or trim the length.
Again the major message is lots of ant sieze paste and tighen quite lightly.
posted by 207.43.195...
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