Vibration While Braking

[Brian Pleet <bpleet@domain.elided>]

When I slow down using the brakes (as opposed to downshifting) my Spider 
vibrates noticeably from 20 MPH thru 0. Since I replaced the master 
cylinder and brake pads, and had the rotors turned about 5,000 miles ago, I 
removed each wheel to examine the brake conditions and found nothing wrong. 
I did have minor play in one front wheel bearing, so I re torqued  that 
side. Still no change, and the vibration seems to get louder over the past 
week. There is no vibration in the brake pedal and feels is good and the 
car stops straight.

When the rear end was on stands, I noticed that when you rotated one rear 
wheel, it took a little before the other side and the drive shaft moved. 
Then there was a small "thunk" as they moved. I checked the clutch and 
differential fluid levels 5000 miles ago. Could this be related?

Also, at 2800 RPM I am now hearing (and feeling) a sympathetic vibration 
from the engine compartment, even if the car is stopped. I can't find the 
cause, and the car is otherwise running perfectly.

Any suggestions on what to look for?



Brian Pleet
82 Spider 
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