Table 1 shows one common service brakes related problems of the 2010 Volvo S80.
| Problem Category | Number of Problems |
|---|---|
| Service Brakes problems |
Volvo brake vacuum pump is leaking oil on the 3. 2 liter motors. Volvo has finally recognized the issue with this leak and has come up with a Volvo brake vacuum pump repair kit (Volvo 31401556 repair kit). Along with the know excessive oil consumption of the 3. 2 liter motor this could cause loss of brake power.
Driving on city street at about 30-35 mph. As I approached intersection I took foot off accelerator pedal and stepped on brake pedal to slow down and stop at intersection. As I stepped on brake pedal, I could hear engine start accelerating and car wouldn't stop. I noticed tach reading between 4 and 5. Although engine was accelerating and vehicle was moving forward it was not moving at excessive speed. I pressed harder on brake pedal and while car slowed somewhat it would not stop. So I decided that the only way to stop vehicle was to move gear shift lever to park and then turn off engine. I then restarted car and it functioned normally. My experience might be an example of what has been called "sudden, unintended acceleration".