15-08-17, 09:59 PM
I had this problem after fitting a pair of new looking second hand front brake discs. There was 1.25mm runout on one of the discs which caused the calliper pistons to be pushed back a tiny amount when the wheel was turned.Multiply 'a tiny amount' by 4 pistons and it was enough to lose the front brake altogether, until it was pumped back up at a standstill. Totally cured by brand new EBC discs.