Operation CHARM: Car repair manuals for everyone.

Pressure Build Up/Hold (ASC+T Regulation)





If the ASC control module detects a spinning wheel (or wheels), and the control module determines that braking action is required to restore traction, a control phase is activated.

Pressure is built up in the rear brake circuit by:

1. The Separator valve closing.
2. The return pump switching ON.
3. Inlet valve remaining open.
4. Outlet valve remaining closed.





Pressure in the brake caliper is now held (or maintained).

1. The inlet valve is closed.
2. The outlet valve remains closed.
3. The separator valve remains closed.
4. The Return pump continues to run.