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Old 07-04-2003, 04:46 PM
LarryBible
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The most common cause of the problem you describe is knocking vacuum lines loose when changing the oil filter.

Since you said you've checked the lines, then it's now time to check the source. Remove one of the vacuum lines that connect to one of the tees on the main vac line that goes from the pump to the brake booster. Start the car and put your finger over the tee to see if there is plenty of vacuum. If not, then it's time to put a diaphragm in the vacuum pump.

If you do rebuild the pump, make sure to check the roller in the pump. If it breaks it can get down into the engine and destroy it.

Good luck,
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