Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Vacuum Sensor 7/160
GENERAL
Type
Vacuum pressure sensor: Double piezo-resistive sensors
The sensor measures the pressure change between the vacuum chamber and the work chamber. The signal ratio between the chambers should correspond.
characteristic
Vacuum chamber (1): Voltage between terminals #30 (#A30) and #40 (#A40) should be similar to diagram 1 below.
Work chamber (2): Voltage between terminals 41 (A#41) and #40 (#A40) should be similar to diagram 2 below.
PEDAL PRESSURE SENSOR/CHECK VALVE (SAME CONNECTOR)
Type
Pedal pressure sensor: Two-pin, quickshifter located within the brake servo on the brake servo pushrod
Check valve: Electric coil with magnet core and valve
Characteristic pedal pressure sensor
Resistance between terminals #1 and #5 should be infinite when the brake pedal is not actuated and 0 Ω when the brake pedal is depressed
Resistance between terminals #2 and #5 should be 0 Ω when the brake pedal is not actuated and infinite when the brake pedal is depressed
Characteristic, check valve
Resistance between terminals #3 and #4 should be approx. 3 Ω.
Check, pedal pressure sensor
Prerequisites (unless otherwise specified):
Check
- Breakout box connected
- Sensor connected
- Ignition switch position II
Check 1, pedal pressure sensor
Voltage between terminals #21 (#A21) and #23 (#A23) should be 0 V when the brake pedal is not actuated and 12 V when the brake pedal is depressed.
Voltage between terminals #21 (#A21) and #24 (#A24) should be 12 V when the brake pedal is not actuated and 0 V when the brake pedal is depressed.
Check 1, check valve
Voltage between terminals #17 (A#17) and #31 (#A31) should be 12 V.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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