Vacuum leak coming from under the dashboard?

1986 OLDSMOBILE DELTA 88
111,000 MILES • 6 CYL • 2WD • AUTOMATIC
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I have a vacuum leak coming from under my dashboard. Where my brake goes through the firewall into the booster. What could be causing the loss in pressure when I apply my brakes?
Nov 8, 2010 at 9:56 PM
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The problem you described is probably caused by a power brake booster diaphragm that has ruptured. Your power brake booster needs to be replaced.
Nov 8, 2010 at 9:58 PM