My parents have a 01 GMC Sierra 2500HD that they want me to seafoam before I change the plugs. I want to use the brake power booster vacuum line but cant find the brake power booster on the drivers side firewall. On my sunfire it is a big bell looking thing but I don't see anything that resembles that on the truck. Could someone with a similar model please take a picture of it with an arrow pointing out the vacuum like that connects to the brake power booster or desribe where I should be looking. Thanks a lot.

 

it probably has hydroboost brakes there wouldn't be a vacuum line to the brakes

 

seems like a good On Topic post for the GM General Discussion area.


+1 on Hydroboost. HD trucks don't use vacuum brakes. Too unreliable when towing. You'll have a Hydroboost setup that runs off of the power steering.

 

suck it in through the PCV hose. It's the hose that goes from the back driver's side valve cover to the top of the intake manifold.