Vacuum booster not holding vacuum - I could tell mine was bad because when I shut the car off and put my ear near the booster there was a distinct hissing of air rushing into the booster can.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car