seattle620

thanks everyone for the responses! much appreciated!

Hi, New to the Ratsun board! I have a 1973 Datsun 620 pickup. I had the brakes done about 6 years ago, but drive the truck under 500 miles a year. The brakes work well except the when i am on an upward incline, when it rolls backwards, it hard to stop. I have to pump the brakes and keep the pedal down to the floor in order to keep rolling backwards. Going forward and stopping has never been a issue, it's just when it's rolling backwards. Any suggestions on what may be the issue? thanks! Jay