401 rear drums

[innellan House]

Because of a recent axle oil leak, I had new brake linings made - these were ground to fit the existing rear drums. Following a recent 3500km journey.....and upon inspection of the linings, it appears only that of the leading shoe (on both sides) has bedded in and the lining of the trailing shoe has not contacted the drum at all. Thus it appears that the shoes are not centralising for some obscure reason. I have checked that the brake cylinder is free to slide, the piston works and all retaining springs are in good order. Any insights would be much appreciated.