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Cayenne

2017-2018 Macan – Manual

2017-2018 Macan – Manual

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Page: 74

Brake system function
Porsche 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 288.

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.

Reduced braking action
Following a long drive over salted or gritted roads, a coating may form on the brake disks and pads that significantly reduces friction and therefore the effectiveness of the brakes.

The brake disks will inevitably begin to corrode if your vehicle is parked for an extended period, resulting in a tendency for the brakes to "judder".

  • To prevent corrosion on the brake disks, the brakes should be "braked dry" before parking the vehicle (this does not apply to vehicles with Porsche Ceramic Composite Brakes).
  • If braking comfort is noticeably impaired, we recommend having the brake system checked by experts at an authorized Porsche dealer.
    Visit a qualified specialist workshop. Porsche recommends an authorized Porsche dealer, as they have trained technicians and the necessary parts and tools.
  • To relieve the brake system on steep slopes, remember to shift to a lower gear in good time (engine braking effect).
    If the engine braking effect on slopes is not sufficient, use the footbrake at intervals.
    Continuous braking can cause the brakes to overheat, impairing their effectiveness.

For Information on brake fluid and checking the brake fluid level:

  • Please see chapter "Brake Fluid" on page 72.

With correctly adjusted brakes and a correctly working brake system, the pedal travel to the point of brake application (start of brake pressure build-up) should not be longer than 10 mm.

  • Whenever the brake pedal travel exceeds this value, have the brake system checked. Visit a qualified specialist workshop. Porsche recommends an authorized Porsche dealer, as they have trained technicians and the necessary parts and tools.
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