Why does the brake dash warning light come on when engine is idling and go out when engine speeds up.

Asked by Mar 01, 2015 at 10:45 AM about the 2010 Jeep Liberty Sport 4WD

Question type: Maintenance & Repair

This seems to happen only when engine is cold. Stop at stop light -light comes on, leave
stop light - light goes out?

2 Answers

36,925

It could be something as simple as vacuum loss to the brake booster. When you are driving you are creating more vacuum. When you are at idle, you create less. If there is a small leak in a vacuum line, it will be noticeable when at idle and negligible when driving at speed.

2 people found this helpful.
80,375

Also check the fluid level in the master cylinder. It could be low. HTH. -Jim

1 people found this helpful.

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