What happens when a Porsche Cayenne Brake Booster fails?
A failing brake booster usually will result in a brake pedal that takes more effort to push and also to slow the vehicle. Typically, if there is a problem with the brake booster, the vehicle will trigger a fault code indicating a problem. This does not always mean that the brake booster has failed.
What causes a soft pedal on a Porsche Cayenne?
If the fluid level is low, check for leaking brake fluid under the car and also at each brake caliper. If the fluid level is fine, try bleeding the system. A soft pedal can be caused by air in the brake lines. See our article on Bleeding Brakes for more information.
Why does my Porsche Cayenne make a hissing noise?
You’ll want to check if the brake pedal goes to the floor with the engine off. If it doesn’t, you have a problem with the system. Usually, this is accompanied with a hissing noise as there will be a leak in the system, either at the brake booster diaphragm or the air line to the vacuum pump.
Are there any mechanical problems with my Porsche Cayenne?
Listed below are Porsche Cayenne common mechanical problems with their likely resolutions. These are the most frequent Cayenne problems diagnosed by our repair shops over the years. An accurate diagnosis of an issue by a Porsche mechanic typically saves you time and money – see our guide to local independent Porsche repair shops that can help.
A failing brake booster usually will result in a brake pedal that takes more effort to push and also to slow the vehicle. Typically, if there is a problem with the brake booster, the vehicle will trigger a fault code indicating a problem. This does not always mean that the brake booster has failed.
If the fluid level is low, check for leaking brake fluid under the car and also at each brake caliper. If the fluid level is fine, try bleeding the system. A soft pedal can be caused by air in the brake lines. See our article on Bleeding Brakes for more information.
You’ll want to check if the brake pedal goes to the floor with the engine off. If it doesn’t, you have a problem with the system. Usually, this is accompanied with a hissing noise as there will be a leak in the system, either at the brake booster diaphragm or the air line to the vacuum pump.
When to replace master cylinder in Porsche Cayenne?
If the brake lines have been bled and there is no obvious change in the brake fluid level, it is probably a good bet that the check valve in the master cylinder has failed and it is time to replace it. A failing master cylinder can cause a few different symptoms.
Where is the master cylinder reservoir on a Porsche Cayenne?
Shown here is both the master cylinder reservoir (green arrow) and brake booster (yellow arrow) on the Porsche Cayenne. Removing the plastic cover at the rear of the engine bay helps gaining access to the vacuum line from the pump to the brake booster.
Shown here is both the master cylinder reservoir (green arrow) and brake booster (yellow arrow) on the Porsche Cayenne. Removing the plastic cover at the rear of the engine bay helps gaining access to the vacuum line from the pump to the brake booster.