I've got an annoying problem with my new Z. It’s a very high-pitched squeak that only occurs at certain speeds. It doesn't start until like 30mph, and goes away at around 55-60 (or at least I can't hear it anymore, I can't be sure it is gone). When I apply a very slight pressure to the breaks (so little the car doesn't even begin to slow) it goes away, and if I press the brakes right it will go away on one side before the other (it happens on both sides). Any idea what this is? Is it something that needs to be replaced, or just something I can adjust? Sorry I don't have more specifics, it’s only been happening for about a week (but happens consistently). Thanks for any suggestions.

Sounds like a brake problem, either with a warped rotor perhaps or the anti-squeal shims behind the front brake pads...

Could also just be the type of brake pad you are using...

See this thread for more info on the problem.

http://www.classiczcars.com/forums/showthread.php?s=&threadid=5064&highlight=brake+squeal