I have a1984 Lincoln town car and the cruise control works fine on a flat highway but as soon as you start up a hill it cancels out like if you touch the brake, you can manually accelerate back up to the preset speed and press the resume button and it will stay on but the next hill it cancels out again, if you press the resume button to make it accelerate back up to the preset speed it will start to accelerate then cancels out again. but every time it remembers the preset speed and will hold it tell the next hill. the vacume lines are good the diaphragm in the unit is good, the linkage on the carb is connected ok. I've checked the brake switch its ok what could be causing it to cancel out when it tries to accelerate to maintain its preset speed?
Fixing Faulty Cruise Control - Popular Mechanics
www.popularmechanics.com/cars/how-to/a116/1272586/
So you tap the brakes and disengage the cruise control to avoid conversation ...holding to a legal speed on both the uphill and downhill sections of the interstate. ...Actually, it will normally drop out if the engine has to work too hard, mainly ... But, it may well propel your new economy car to blatantly illegal velocities unless ...
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It seems the wire plug that connects to the cruise control unit under the hood must have had some corrosion on the contacts, I tried to disconnect it to inspect it but could not get the lower plug lock to unlock so was going to wait tell I got the right tool but when I got back on the highway I turned it on and it works fine.
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