Looking for a vacuum line off the manifold on a 1990 ford tbird for a brake booster.

Question edited for clarity, spelling and add maker.
Question moved to model category.

Help in the link, plus link to specialty forums.

https://www.google.com/search?q=1966+galaxie+500xl+vacuum+diagram

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The vacuum lines on a 2003 Ford Explorer 4.0 are connected to the intake manifold, the brake booster, the EGR valve, the PCV valve, the air intake, and the fuel pressure regulator. The exact routing of the lines will depend on the specific model and engine configuration.

there is a tear in the vacume hose look closer

Your power brake booster went out or the one way check valve in the vacuum line going to the booster from the intake manifold

This is a vacuum line. It produces vacuum to the brake booster which in turn makes it easier for you to press the brake pedal to stop.

Toyota93 man,
I have the same problem with my 97 f-250 right now, same engine. I just replaced the booster and it didn't solve the problem. Obviously we are losing the vacuum somewhere. Check your vacuum lines for cracks as that is the cheapest. also the check valve on the booster itself. The vacuum line from the booster goes to a "vacuum tree" "vacuum solenoid"? I dont know, no one can tell me. Not even the ford dealership. but its mounted on top of the wheel well and it has 4 vacuum hoses coming off of it. The largest hose then goes to a vacuum pump on top of the power steering pump. That is my next change. I'll let you know if that fixes it. Let me know if you get an answer.
mike

Booster line will attach to back side (firewall side ) of booster chamber.

Should find a metal elbow coming out of the booster chamber that the vacuum line will slip over.

When you look at the booster chamber from the front, the location of the line should be at approx. 9 o'clock (as if looking at a clock dial)

Make sure you have a secure vacuum line from intake manifold to booster. Hard brake pedal is a lack of vacuum to booster or a leaky diaphragm in booster.

make sure the vac line is connected to the intake if so replace one way valve at booster

This is the power brake booster vacuum line, the little round thing is a vapor separator to keep gas from entering the brake booster and destroying the rubber diaphragm, the line goes to the intake manifold near the rear of the manifold, the length of the vacuum line is a good guide to where it hooks up, if you run the engine you will hear a very loud vacuum leak to say the least.