Hi there 
I’ve got a Mk4 ND with a sticking front brake calliper piston … can anyone confirm the diameter of the piston before i buy a repair kit please 
51 mm dia. I bought a piston and seal kit from Frentech braking £25.95 for my 1.5 ND with the standard brakes. A straightforward repair.
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51mm as stated.
I know others who’ve used the repair kit from Bigg Red successfully:
https://www.ebay.co.uk/itm/315486367156
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