rear brake problem w204 c220

[gary3170]

hi all my wifes 220d 2010
last week i had a warning pads low (rear)
bought new pads fitted them and low and behold (empty brake fliud pops up?)
car up on my mates lift 2 brake lines left side corroded,replaced top up fluid
brakes not working rear and pedal very spongy??
anyone any ideas
cylinder maybe?
thanks in advance
gary

[gary3170]

Bled them again, got a tip to raise rear of Car first, problem solved
Ta mate