Brake problem on Astra

I have a 1994 Astra 1.4i. It needed a new flex hose leading to the o/s
rear brake to get the MOT. When I picked it up and drove it home I
notice that with light pressure on the brake pedal occasionally it
would sink down a few inches with little resistance. I took it back to
the garage and he took off all the wheels and bled each wheel brake
while I was there but when driving home again the pedal was still
sinking down. He had given it a road test but he said it didn't do it
for him. I think he was braking harder than I was. The servo check
seemed ok. Can anyone tell me what the next step is.

 

Take it for MoT. if it fails on brakes, go back to the garage and play f**k
with them.

Mike

 

Definitely not bled properly I would say