Ok so a month ago my flexible hosing burst and I got the garage to mend it costing 77 quid. Then my brakes started leaking again so tool it back and they said it was a corroded brake line bolt and had to sand the caliper down and refit with new bolt , this cost another 151 quid which I was not happy about! My brakes now feel really soft and spoungy, why is this? Are they ok