You may want to check the rest of the vacuum system out first. Sometimes those black elbows perish and leak. Also check the check valve at the booster where the pipe enters. Air should be allowed out but not in. Washing them out with warm water can help if they leak a bit. If you have vacuum present, tugging the check valve out of the booster should give you a good hiss.
I don't know how the tic model is set up but the mid 80's that we have in this country don't have a vacuum reservoir other than the brake booster itself.
A test you can do is: 1, apply brakes several times with the engine off to make sure there is no residual vacuum. Pedal should be hard and heavy.
Then 2, with your foot on the brake pedal, start up the engine.
You should feel the pedal go down as the assist comes on (vacuum being created). This should give you an idea if the pump is working or not.
Those pumps can be pricey but usually last a very long time.
Steve
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