Brake Servo Non Return Valve STC780 RRC D1

The Brake Servo Non-Return Valve STC780 is used in the brake booster vacuum system on Range Rover Classic and Discovery I models. This valve maintains vacuum within the brake booster, ensuring consistent brake assist and reliable braking performance.

The non-return valve prevents vacuum loss by allowing airflow in one direction only. When the valve fails, symptoms may include a hard brake pedal, reduced braking assist, or inconsistent brake feel. Replacing the valve restores proper vacuum retention and brake servo function.

Vehicle Fitment

Discovery

• Discovery I | 1994–1999

Range Rover

• Range Rover Classic | 1987–1995

Supersession Part Numbers

No supersessions found.

FAQ

What does the non-return valve do?
It maintains vacuum in the brake booster, allowing consistent brake assist.

What symptoms indicate a faulty valve?
Common signs include hard brake pedal, reduced brake assist, or inconsistent braking feel.

Where does this valve install?
It installs in the brake booster vacuum line between the intake manifold and servo.

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Part Number: STC780

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