any help would be great.got an 09 brake pedal going to floor and making hissing type noise
thinkin possible hydro-boost.anybody ever have this concern.

 

sounds like that may be your prob maybe

 

more info on brakes.was wrong with info,pedal takes more effort to push and slow to return.thinking possible hydro-boost and/or restrictor in return line dislodged.had one before with dislodged restrictor but had high steering effort.no steering issues with this truck. any suggestions.thanx.

 

fyi was able to finally look into brak problem on friends truck.found restrictor dislodged from i nside of what i beleive is a pressure line from bottom of p/s pump to hydro-boost.have seen this issue before,if condition occurs you will hear a loud hissing noise,high brake pedal effort and possible grabbing braks,thought would just pass on info to help anybody.