BlackGMC

iTrader: (31)

I am getting a DIC message saying "Service Brake Booster". Do i need to add a check valve inline to the booster?

AgFormula02

iTrader: (9)

What year is your truck?
I had this issue and had to get my cluster reprogrammed. (04 model)
But it was not related to the blower. It was a software issue.

I believe the brake boosters have a built in check valve.

BlackGMC

iTrader: (31)

2004 and it has that weird thing attached to the booster.

03sierraslt

iTrader: (22)

Yes, you are putting pressure in that line if not.

TrickTurbo

iTrader: (12)

Is that electric assit if the engine dies.?

TIM Z

iTrader: (12)

I was told it had nitrogen in it for emergency use. Not 100% though.

Ferocity02

iTrader: (59)

It should already have a check valve which lets air out of the booster but not in. It's the 90 deg black plastic piece that connects the hose right to the booster. Thats what it look like on mine at least ('01 5.3L).

03sierraslt

iTrader: (22)

His booster is different then yours, his is like mine and has that canister attached that the vac. line hooks to. I am not exactly sure what it does either. Rick that sounds legit...Who knows.

charcold-bowtie

iTrader: (10)

Yeah, if the truck dies while moving that little thing runs like a vac pump I think to help with the brakes.