If you are still having problems with the vac pump take it apart and use some motor oil to slick the sides of the cylinder. Just take off the front and wipe it down. Also check the check valve on top, the one that didn't come with the kit. I did mine like that and it started working like it was suppose to.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon