Pneumatic toilet flush is difficult to push

[mxo123]

I’ve installed a Geberit concealed toilet cistern. It has a pneumatic dual-flush button. The flush button is very difficult to push, once pushed it does flush but it requires a lot of effort.

Is this normal for a pneumatic flush button, can anything be done to make it easier to push?

 

[ShaunCorbs]

Yep this is normal

 

[mxo123]

Yep this is normal

Can it easily be replaced with a non-pneumatic or what are the options?