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Registered User
Join Date: Jul 2012
Posts: 1
Porsche Crest active Brake booster 814

Hi wondering if anyone can offer assistance
have a 2003 cayenne Turbo. PSM light came on (Yellow) and also a red warning, (WARNING BRAKE PROPORTIONING)
Purchased durametric software and Read fault codes,
had a code for brake pedal distance sensor and active brake booster.
Replaced distance sensor. That code cleared and did not return.
Code 814 still in system. (Durametric software does not tell me what it is other than Active Brake booster)
I have no booster fault codes.
There are no leaks to the booster and it holds vacuum, the pipes all look good.
Does any know what a code 814 is?
Does anyone know what active brake booster means in Porsche language?
Does anyone have any experience in this particular area?
I will give full feed back if I get some assistance.
many thanks
Old 07-30-2012, 11:55 PM
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jrumiano's Avatar
Join Date: Sep 2007
Location: Bucks County, PA
Posts: 138
This might help.

Good luck,
1985 3.2 911
Old 07-31-2012, 01:47 PM
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It'll be legen-waitforit
stealthn's Avatar
Join Date: Jan 2002
Location: Calgary, Canada
Posts: 4,301
How often do you change your brake fluid?

Peppers need it way too often, not sure what the cost of an ABS module is but I bet it's not cheap

Bob James
Bob James
'79 911SC Targa - Sold
06 Cayman S
Old 08-01-2012, 04:59 PM
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Registered User
Join Date: Apr 2016
Posts: 1
Sorry to bump this, but I am having the same exact problem that the op was having.

Scanned with durametric, and came up with a code 814. Would not clear, so replaced the brake distance sensor. Code still will not clear.
Ran an output test on durametric, and it all checked out ok in the psm module. Checked signal on both pressure sensor and distance sensor, and they both ramped up perfectly together.
I have zero vacuum leaks. Checked all of the lines visually, and with a vacuum pump.

Has anyone successfully solved the culprit to this code? Thanks in advance for helpful replies.
Old 04-05-2016, 06:32 PM
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