That is usually a sign that the vaccuum pump diaphragm has a tear in it, allowing engine oil to enter the vacuum system.

If the pump was rebuilt by some one else, that means they did not take the time to clean the lines. Engine oil in the vac system will cause all sorts of problems, including ruining a brake booster.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K