There have been many forum posts about smoke testing for vacuum leaks, few have reported positive results from doing so.

If this were my Cayenne I would do nothing more but run a diagnostic scan periodically. If you don't already have a scan tool spend the quid to acquire your own.

When the fault becomes persistent it will be easier to sort out.

Be aware that a vacuum leak can be flagged which is actually low vacuum from a weak pump.

 

Zero. No beeps, no nada. It's quite liberating, to know I can defer this repair for the next year!

 

Wheres the location? Tkss

 

Mine is better too !!

 

I tried unplugging mine shortly after you posted this and started getting warnings every time I started the car up. They have not gone away. I think I like the brakes and pedal feel more without the booster running as well! It might really depend on what pads you are running. It tames down the softer pads that have a lot of initial bite.

 

yeah but the faulty displaying is annoying, how can we stop it

 

Better than the Italians.

I have brake booster warnings now as well. Already replaced one line. May be headed for the smoke test soon. Subscribed.

 

Hi,

Does anyone know where these pipes are on a 4.8 GTS please?
I seem to only get the alarm sometimes when its cold in the mornings.

 

Today i found the cracked hose.. Shame on Porsche!! used garden hose and It worked Fine!!

 

Thank you so much!! Helped a Lot!!

 

Cracked hose

 

With no cracks in the line the brakes seems much more responsible

 

my brake booster vacuum line cracked today, and my brakes do not work well at all now
mine is cracked like the ones in the pictures above , its the line that goes under through the fire wall

Im trying to buy a new line, but cant find the name or part number of this specific line

can anyone tell me what line that is and how hard it is to disconnect it at the other end, I assume its goes to manifold?

please help, I do want to do this myself, Im trying to do all maintenance work on this car to keep it reasonable.

 

i think this should help:

https://www.ebay.com/itm/For-Porsche...sAAOSw-wJaHnWz

This listing includes:
One x 955 355 579 51 Brake Vacuum Hose Pump to Booster Line
One x 955-355-577-51 Brake Booster Vacuum Line-Booster to Connecting Hose -Note: Includes pressure sensor.

 

It's only better.... until you need to panic stop, on the freeway. Traffic suddenly came to a halt and the pedal felt wooden, with massive brake fade. Good thing the fast lane has a small shoulder....whew.