When truck stops and go to accelerate I have a release of energy ?

[truckin 79]

I just ordered all 3 brake hoses and a new master cylinder so will report once I get these put on. The best part is Rockauto is delivering in my area again so it only cost me 70 dollars for all 4 items.
On a side note I tried doing a panic stop at about 30 mph the other day and brakes did not lock up and truck stopped but took longer then I thought it should. Hopefully soon I will have working AC and good/better working brakes