struggling with disc pads

[madcyclist09]

I am replacing my disc pads, I got them out ok, but I can't seem to be able get the new one back in, the piston are pushed in.
Any advice would be appreciated

 

[Alex321]

If you can't get the new ones in, then the pistons almost certainly aren't fully pushed in.

It is surprising how much force it takes to push them right back in when they have become extended due to old pads being worn right down. If you can see ANY piston sticking out, then they are not fully in, they should be completely level with the surrounding surface.

 

[Gwylan]

I am replacing my disc pads, I got them out ok, but I can't seem to be able get the new one back in, the piston are pushed in.
Any advice would be appreciated

Are you sure the pistons are fully pushed back?
Are the pads the right ones?

 

[Moodyman]

What brake calipers are they?

Some pads needs a bit of a wiggle to sit in their slot properly - ie Avid BB7.