I changed my plugs and cops and now my brake pedal is hard to push and get my truck stopped. Has this happened to anyone else before and also what do you do to fix it?

 

You probably disconnected or knocked off the large vacuum line to the brake booster. Does it make a hissing sound?

 

there is a hissing but sounds more like top of motor somewhere but the big hose is connected...

 

Re-double check the vac line to the booster, it is either not connected or broken. 99% sure that is where the problem is at.

 

X2

its definitely a problem with your vacuum line

 

Yep, X3

 

I played with the lines yesterday for a few hours still couldnt get it right maybe theres a clogged line but I took to the shop to let them sweat it out..lol I will let you know what they find Maybe when I took the throttle body off and cleaned it I have the wrong hose connected to something not really sure.

 

it appears it was a crack in the hose mechanic fixed it for free .