bled up the whole system, new booster, master(bench bled), new wheel cylinders. It had a good firm pedal, after a few pumps with car running brake light comes on pedal sinks to floor. So we swap a second hand dist block in to it and also notice right hand bleeder is sitting very close to stub axle and may be weeping brake fluid, we think this is the problem. New wheel cylinders have such small bleeders that tightening them can be a problem..... left hand side bleeder you can get a socket on to it.So we tighten it up best as possible and re-bleed brake system, so far so good, although brake pedal dose seem close to the floor when car is running and no more brake light on....