Weak brake after rear subframe replaced

[Sally86]

Hi,

I had my subframe replaced a few days ago after hitting the kerb! But now, the brake pedal is so weak, literally need to press to the floor. The garage people said that it’s normal and takes a while to go back to normal. 
 

I’m just wondering if this is normal.. or they’ve fixed one problem and created another. I paid £700 to replace the subframe. 
 

Thanks

[Trevor]

No, that is not the case, the pedal should be up the top and firm not at the bottom of its travel.
Sounds like they have not set up the brake compensator (if fitted) and this is affecting the brake pressure.

Alternatively, there may be air trapped in the system and needs bleeding out