How Does Demco Vacuum Tee Fitting for Factory Brake Booster Sensor Port Install

Updated 11/03/2025 | Published 01/29/2025

Question:

When installing the Demco 6257 vaccuum tee adapter, since there are only three connections on the hose assembly. One goes into the brake booster to replace the sensor, one to plug the sensor in, and the tee to the control unit, does that mean I only use the check valve going to the control unit? Soooo…. I’ll have a check valve left over?

asked by: Gary M

Expert Reply:

Hey Gary, the Demco Vacuum Tee Fitting for Factory Brake Booster Sensor Port # DM6257 installs inline with the brake booster vacuum line of the truck and then the center barb is what runs to the braking system. Does that make sense?

expert reply by: Jameson C

Jameson C.

11/3/2025

Hey Gary, did the setup with the Demco vacuum tee fitting make more sense once you connected it inline with the brake booster line? Your feedback could really help others sorting out the same check valve question.