brakes soft vacum leak between master @ booster?

 

We need a little bit more info than that.

But spray starter fluid on it with the engine running if there's a leak it'll die a little bit.

 

x2 more info. Prob either need an adj., or there are worn parts. If its not pulling or making funny noise or doing anything erratic when on the breaks, then, like I said it could be just a quick adj... It's got sufficient fluid, right?