Help I'm now on my 4th brake power booster in just over a mo. They start sticky then get harder to apply over a few days. My mechanic has change the power steering pump, flushed the whole system. Picked the truck up yesterday and it starting again, what is going on , help! 2005 2500 just over 100000 miles

 

Are you using the correct fluid? I don't know what an 05 should use, but I have read that some people put ATF in 2nd gens by mistake.