Vaccum line fell off rear end not sure where it belongs

for the whole car, wow. tall order that.
surely we can focus on an area,
under hood

1. gas tank EVAP parts? rear of truck.
2. Evaporative emission canister purge valve on engine
3. HVAC vac parts?
4. brake booster..
5. EGR vac, reg solenoid.
6. Throttle body leak vacuum or gummed up throttle valve.
7. IAC , stuck, a vacuum + elect, part for idle controls
8. PCV valve leaking or hose to it cracked, is Vaccum.

engine problems? no hint as to what's up doc.
Scanning PCM shows DTC errors , ??
fails smog for evap or egr? both?
brake problems?
HVAC problems?
there is a sticker under the hood for engine hose routing, (lost?)

the service manual covers all that ( we have none)
https://eautorepair.net/Marketing/Default.asp

is this a vac hose fell off question
or how to test vacuum related parts>

best of all is post photos of things wrong under hood
like hose not connected then tell or show where the other end goes?

It goes to the front of the car either to the proportioning valve or directly to the master cylinder.

The proportioning valve simply ensures that the front brakes are applied before the rear brakes are, to prevent sideways skids from loss of rear traction. The valve also serves as a warning light when one end, either front or rear, of the system has deficient line pressure. Inside the valve is a cylinder, and a piston that belongs in the center of the valve cylinder (when fluid pressure on each side is equal). When one side of the valve (front or rear brake system) loses pressure (like from a leaking brake line), the piston gets pushed to the low pressure end and makes contact with a switch terminal that turns the light on.The trick to turning the light off is to figure out which end, front or rear brakes, the piston is on, and then bleed the other end to center the piston and turn the light off. Too much pressure on the brake pedal will cause the piston to go past center to the opposite end, and a close watch on the brake warning light will reveal that as the lamp will flicker once while the piston passes center.
Gently depress the brake pedal (requires an assistant) with a bleeder open and close the bleeder as soon as the assistant (brake pumper) sees the light go out. If he sees the light flicker once bleed the other end of the vehicle to go back towards center.

Replace the rubber brake hose that goes to the Brass Block

Try Auto Parts Store first ,then a Dealer

Other end of hose comes from steel brake tubing
from front

Brake parts specialty store. Not regular parts store.

The TEE is also a vent line for the rear axel.

Not part of brakes.....a clean pass through as a vent

It's probably the breather for the rear differential. Leave it be.

Hi there. If you have determined that the brake system doesnt have any leaks in the lines or at the calipers or brake cylinders, I would start by checking for vaccum to the brake booster first. There should be a large vaccum hose going from the power booster down to the top back of the engine. If this got unhooked or broken, your brakes will feel like old manual brakes rather than power. Make sure you have good suction by unhooking one end of this line with the engine running and place your hand over it to see if it has suction. GT would be the sporty version of the car and usualy has an emblem either on the fender or rear bumper saying GT. If you dont see this you probably have the L series.

Dist should go to rear of carb base but can also go to intake. large fitting at rear goes to brake booster. There should also be another large one for pcv valve.There other ports that supply vacuum to accessories options. Some ports on that carb are above throttle plate and only give vacuum at times when throttle is open. anything that needs full time supply should not be connected there.Block off all unused ports.

I'm not sure what you are looking for. Are you looking for brake line diagram? Diagram of brake assemblies? Vacumm diagram? Here's a couple, if they don't help, let me know exactly what you need.