it is large ,but to be honest it really could be a multitude of things ,plus you could do another brake test and the imbalance could drop ...i have taken trailers for a voluntary brake test before the main test ,passed the voluntary then failed the test ,and that's doing the MOT straight after the voluntary and on the same lane and same brake tester!!!,and to top up all it wasexcellent reading when it passed ..so without going anywhere and 30 mins after the voluntary a fail
norb, November 2011