I need to replace the front brake disks but am having difficulty removing the caliper mounting bracket. I managed to get the top bolt out after a bit of a struggle but the bottom one refuses to move. Any ideas on how I can proceed, do I need to take the hub off and drill out the bolt??

From the drivers seat. The AAV looks like an aluminium tube, about 4 inches long with a feed from the air intake and then around to the inlet manifolds. It is reasonably easy to remove from the engine but be careful if it is hot as removing the AAV leaves an open hole into the coolant flow. If you p...

I had a similar problem on my v12 XJS. It was caused by the aux air valve (rear of the left hand bank) not operating correctly. This is a wax filled item which allows extra air into the system when cold and should shut off this flow once the engine has reached running temperature. Over time these ca...