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Volvo XC90 FWD L6-3.2L VIN 98 B6324S (2007)07 · Brakes and Traction Control
07 · Brakes

Vacuum Brake Booster: Testing and Inspection

Make
Volvo
Model
XC90 FWD
Engine
L6-3.2L VIN 98 B6324S
Year
2007
Section
Power Brake Assist › Vacuum Brake Booster › Testing and Inspection
Brakes and Traction ControlTesting and Inspection · page 1 of 15
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Vacuum Brake Booster: Testing and Inspection

Checking the vacuum pump

Fault-tracing information

The vacuum pump raises the power brake booster efficiency when the negative pressure of the engine is too low, e.g. when the engine is switched off
(ignition on).
Operating difficulties may make the brake pedal stiff.

Reasons for the vacuum pump not working can include:

-

Open-circuit, short-circuit in the wiring to the vacuum pump

-

Defective vacuum pump switch

-

Defective vacuum pump.

Reasons for the vacuum pump operating constantly can include:

-

Short-circuit to supply voltage in the cable to the vacuum pump

-

Defective vacuum pump switch

-

Defective hoses to the vacuum pump.

Continue - Check the function of the vacuum pump

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Check the function of the vacuum pump

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Parts & tools for this job For 2007 Volvo XC90 3.2L

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