First off, I have a 2007 GL1800 with ABS. Last week I took off the rear wheel and changed out the 90 degree OEM stem with the FOBO T-Valve. Next up is the front wheel...my question is do I have to remove the calipers or not? I watched Fred's DVD on removing the front wheel and he removes the calipers, but doesn't really explain why it is necessary. Could someone please tell me the ramifications of not removing them....