Cold Weather make me have to pump brakes

Hey Guys, and gals,
So I have a 95 Rodeo 4x4. When it's cold (below 30 degrees) I have to pump the brakes to soften them up. Otherwise, it feels like I have
no power brakes at all. It takes about 3 pumps to get them going. Has anyone else had this experience? I'm wondering if it is the check valve.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.