I have tried search and I didn't find anything. I can't find where the tube from the brake booster hooks on to the firewall, goes across, then down to a rubber hose. I don't know where this goes to. I think it is suppose to go to the engine, but I can't find where it goes to. I have searched the manuals and have come up with nothing. I have an 86 GXL with an 87 turbo II motor. Any help would be appreciated. Thanks.

 

I dunno about the chassis, but the turbo 13BT has a large (1/2"?) fitting on the backside of the plenum on the upper intake manifold...



-Ted