Join Date: Apr 2007
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Not sure on lag's, but on most vehicles I've owned there will be a nylon washer between the arm fixes to the a-frame. I know this can disintegrate over time, and will cause a cracking sound.
Someone on here should be able to tell if there should be one.
If it's a gonna then should only cost around 30 pence for a new washer and 10 minutes of your time to fix.
Hope this helps!