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Anonymous posted an answer for this 1997 Volkswagen Jetta:
"Look for screw (starred? HEX?) on back side which loosens or tightens the center piston...."
"It is a four digit number in a removable front page of one of the thin user manuals. If..."
"If Orange, ok, if flashing Orange, still OK to drive. If flashing RED, better not drive..."
967 people helped