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Discussion Starter · #1 · (Edited)
Main information: 2006 volvo s40 2.4i nonturbo. Vacuum pump comes on everytime brake pedal is pressed and brakes gently sink. Brakes are normal with car off.

Other information No CEL. Doesn't happen when I fast idle the car (or at least, takes longer to happen). Slight press of gas pedal causes engine rpms to lower to near stall (~600 rpms) but anything past beginning push is fine. Obvious vacuum issue there...

Seems to me like the check valve, but VIDA is :thumbdown: when it comes to diagrams/diagnostics regarding it.

Anyone have any ideas? I've exhausted my search for any relays/fuses related (aside from fuse #33 in the engine compartment).
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