Hydroboost leak

[gave20]

I'm starting to get a leak on the left side of the master cylinder, I think this is the hydroboost or power assist unit. Do you know what the part number is and if it's a hard install. It looks like I pull the lines remove some bolts and slide the new one in. '04 GMC 2500LD

[GM-Tech]

I'd make sure which is leaking before replacing anything. The hydroboost is a real bear to get off because of the way the rod from the hydroboost mounts to the brake pedal. It looks like it just slips off once the clip is removed, but there's no play whatsoever and darn near impossible to get the rod disconnected. It can be done of course, but prepare for a battle.

[gave20]

I thought the hydroboost was bolted immediately behind the master cylinder; the piece I'm talking about has the power steering lines and brake lines going into it. If it's not, then was is it because that's what I suspect is leaking.

[GM-Tech]

That is the hydroboost. But what do you think connects all that stuff to the brake pedal? There's a rod that comes out of the back of hydroboost. On a non-hydroboost, the rod is part of the vacuum booster.

[pm26]

Which trucks have the hydroboost? I have vacuum brake booster on my '06 Z71.

[gave20]

2500 and up.