Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Brake Assist System (HBA)

BRAKE ASSIST SYSTEM (HBA)

The Brake Assist System (HBA) analyzes how hard and fast the driver wants to brake. It monitors the brake pressure via a pressure sensor. The passenger car brake assist system uses a vacuum booster solenoid. The Sprinter uses the hydraulic control unit to develop the brake pressure.