718

Cayenne

2017-2018 718 Boxster – Manual

2017-2018 718 Boxster – Manual

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Page: 68

Footbrake

Vehicles without Porsche Ceramic Composite Brake (PCCB)
Even though the brake disks consist of alloyed gray cast iron, they will unavoidably start to corrode if the car is parked for an extended period. The brakes will tend to “rub” as a result.

The nature, extent and effects of corrosion depend on the amount of time the vehicle was parked, whether road salt or grit was spread and whether grease-dissolving agents were used in car washes.

If the braking comfort is noticeably impaired, it is recommended having the brake system checked by experts at an authorized Porsche dealer.

Brake system function
Porsche sports cars are equipped with a power assisted hydraulic dual circuit brake system with disk brakes at the front and rear.

Both circuits function independently. One brake circuit operates the front left and rear right wheel and the other operates the front right and rear left wheel.

If one brake circuit has failed, the other will still operate. However, you will notice an increased pedal travel when you apply the brakes. Failure of one brake circuit will cause the stopping distance to increase.

Responding to warning symbols
The functionality of the brake system warning light can be checked by switching the ignition to the “On” position (position 1) and verifying that the warning light illuminates.

Brake warning light USA

Brake warning light Canada

The warning light in the instrument panel lights up. A message will be displayed on the multi-function display of the instrument panel if the brake fluid level is too low, or (if the brake pedal travel has increased) one of the two brake circuits has failed.

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


Brake components

Brake pedal and brake booster

Obstructed pedals
Unsuitable or incorrectly secured floor mats and other objects can restrict the movement of the pedals or interfere with operation of the pedals.

  • Ensure the floor mats or other objects do not interfere with the movement of the pedals.

Absence of brake power assistance
The brake booster is only operative when the engine is running. Consequently, much greater force needs to be applied to the pedal during braking when the engine is switched off or in the event of a faulty brake booster.

  • Vehicles with defective brakes must not be towed.
  1. Please see chapter "Towing and Tow-Starting" on page 257.

Water film on the brake disk
In heavy rain, while driving through water or after leaving a car wash, the braking action may be delayed and increased pressure may be required.

  • Allow a greater braking distance from the vehicle in front and "brake" the brakes dry at intervals. Always ensure that this does not affect the traffic behind.

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