They all break promises, it's what they do. That's why I would rather limit their power as much as possible.
That's why the Peers should be added via a process independant of the Government.
personally, i would only pay them after they have kept the promises they made. it would focus their minds wonderfully. maybe keep half their salaries until the end of parliment. then have an independent committee decide if they have done enough to get the rest.
I think Cuba's political system is pretty cool.