1990 Lincoln Town Car air pump

Suspension problem
1990 Lincoln Town Car Two Wheel Drive Automatic 120000 miles

I have a 90 town car. The compressor doesnt turn on. I also have a broken brake line. 1st, id the brake line related to the compressor turn on?
With the engine running, I can add air at the valve on top of the pump, the suspension rises and maintains until the key is turned off. What conditiona must be met for tha compressor to turn on?
Is the compressor not turning on related to the brake hydralic fluid?
where is the air bag switch located in the trunk?
HELP