2009-2011 911 – Manual

2009-2011 911 – Manual

Page: 49

Brake system warning light
You can check the functionality of the brake system warning light by switching the ignition to the "On" position and verifying that the warning light illuminates.

Brake warning light USA
Brake warning light Canada

If the warning lights in the instrument panel and onboard computer go on while driving, the brake fluid level may be too low, or (if the brake pedal travel has increased) one of the two brake circuits may have failed.

A greater braking pressure will be required, stopping distances will be longer and the braking behavior will change, particularly in curves.

With correctly adjusted brakes, and a correctly working brake system, the pedal travel to the point of brake actuation should be 1-3/16 in. to 1-9/16 in. or 30 to 40 mm.

Whenever the brake pedal travel exceeds this distance, have the brake system checked.

Brake pedal

Obstruction of Brake Pedal

Unsuitable or incorrectly fixed floor mats or objects can reduce the travel of the brake pedal or prevent you applying the brake pedal.

Any obstruction of the brake pedal could increase the stopping distance.

  • Always check the movement of the brake pedal before driving and make sure that it is not obstructed by a floor mat or any other object.
  • Secure the floor mat to prevent it from sliding into positions that could interfere with the safe operation of your vehicle.
    Your Porsche dealer will be glad to offer you nonskid floor mats of the correct size including a securing possibility.

In case one of the two brake circuits fails, increased pedal travel is required to bring your vehicle to a full stop.

Riding the Brakes

  • Before descending a steep grade, reduce speed and shift the transmission into a lower gear or driving position to control speed.
  • Do not "ride the brakes" by resting your foot on the pedal when not intending to apply brake pressure.
  • Do not hold the pedal down too long or too often. This could cause the brakes to get hot and not function properly.

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