Posted by JohnD [172.69.62.133] on Monday, December 11, 2017 at 06:35:54 :
In Reply to: 47 Powerwagon posted by Dlar688 [172.68.132.8] on Sunday, December 10, 2017 at 21:20:17 :
If your truck has vaccuum assist brakes, check for a bad vaccuum leak.
Your description of the problem has brake use as a common denominator.
Heres a cut and paste test
How do you know if you have a bad brake booster?
Start the engine and let it idle. 7. Now, push down the brake pedal and turn off the engine, but hold the pedal depressed for about 30 seconds after shutting off the engine. The pedal should hold its position, if not, there's a leak in the brake booster, valve, vacuum hose or intake manifold.