Nubira bleeding problems

[Nubira_in_UK]

I recently changed some brake pipes and then started to bleed the system. I started from the master cylinder, throught the ABS block, and then onto the furthest wheel from the fluid reservoir working forward. Things seemed ok with the engine off but when I started the car and pushed the pedal it just went to the floor with no pressure at all. Have i missed something or is the master cylinder knackered?

Thanks in advance for any advice

[Daniel]

Hi,
Well, if you have done a "manual" bleeding I hope you didn't have floored brake pedal in the process as MC seals damage can be done with this method.

[Nubira_in_UK]

Thanks for getting back to me on this. The bad news is that i did floor the brake pedal. Does this always mean a knackered cylinder Anyway i have spent long enough on something that should have taken an hour or so, at least i have learnt something new from talking to you guys, thanks.

[Daniel]

This does not always mean a knackered cylinder. But internal seals have travelled to places they never visited before and maybe dislodging some sludge damaging cup seals. You may try a new full purge procedure but I wouldn't trust anymore on such MC unless it is rebuild with new parts. This is quite well described in the service manual.

Hope it helps,