Break problem Porsche Cayenne Turbo 08

Asked by Apr 30, 2017 at 11:07 PM about the 2008 Porsche Cayenne Turbo AWD

Question type: Maintenance & Repair

I tried to drive my Porsche cayenne today and i had
a problem in the break
When its in the parking position i can feel the air in
the break when i press the pad and its normal
But when i put it in the drive mood its hard to stop
the car i need to press my foot on the pad hard to
stop it its like loosing air when i put it in the drive
mood
Plus i have no alarm no nothing
Can the experts help me in this and see whats
might the issue and what is the solution ? Thanks

4 Answers

175

I would guess something to do with the brake booster from your description of a hard vs soft pedal. The reasoning behind it isn't crystal clear however. Also, it does make sense that there'd be no lights or alarms as most brake boosters are entirely vacuum controlled, and because of the variance in vacuum in a typical drive cycle, I'm sure most manufacturers wouldn't want false alarms. Do you have ANY type of check engine light on or anything that would indicate a vacuum leak? If not, it could also be as simple as the booster check valve being bad. This also goes on the assumption that you aren't hearing any hissing noises that are abnormal. Be sure not to drive the vehicle until this is repaired/solved. Your Cayenne is a VERY heavy vehicle and you absolutely can not reasonably muster enough force on the brake pedal to stop in an emergency situation with a malfunctioning brake booster or other brake system problem.

There is no check engine and no alarm

175

So, you need to have a mechanic inspect the brake system, probably focusing on the brake booster and/or the engine's vacuum system. Again, be sure the vehicle is towed to where ever you plan to have it repaired.

81,995

The brake booster is bad. Having to step hard on the brake pedal is a good indication of a bad brake booster.

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