The valve only has a couple nuts that hold it on, maybe just pull it off and clean it out as best as you can. If you have access to a vacuum tester like the one linked below you can actually open the valve and clean the whole inside out as well as see if it is sticking at all when being activated/opened.

http://www.harborfreight.com/brake-b...kit-92474.html

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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama)

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X5 pics

RIP 4.6is.....

2003 4.6is