Home Technical Discussions Porsche 964

Porsche 964 Traction control and brake light on.


Permlink Replies: 6 - Pages: 1
Last Post: Apr 12, 2012 12:43 PM Last Post By: HighSpeedTraction
ken379

Posts: 2
Registered: 09/01/04
Traction control and brake light on.
Posted: Sep 1, 2004 9:00 AM
  Click to reply to this thread Reply
In my 91' C4 the brake light and Traction control light have come on along with the warning horn that sounds about 20 seconds after start. I have checked the hydro pump(no sounds of over heating) looked at the pressure switch(no sign of leaking) and there is plenty of fluid. When I first start the car the Pump does run and build up pressure, and the brakes seem to work fine (the pedal is easy to push) The only item that seems not to be working correctly is the traction control, it does not seem to want to engage. Any help would be appreciated.

Ken
Adrian

Posts: 15
Registered: 07/13/04
Re: Traction control and brake light on.
Posted: Sep 1, 2004 9:20 AM   in response to: ken379 in response to: ken379
  Click to reply to this thread Reply
Dear Ken,
This is quite a complicated system and no amount of emails is really going to help you unless you completely understand the system and are able to recognise what is going on.
Your owners manual provides some information but it is not written well.
Important to remember that you MUST make sure the brake boost hydraulic pump is working correctly at all times. If this fial you will have brake problems, serious ones.
The combination of lights you have is saying you have a brake fluid pressure problem.
It is normal for these lights to be on at first start up of the day and stay on for up to 60 seconds and they go off. If they are staying on do not drive the C4.
The system will hold pressure for 4 hours or so after the engine is shut off.
I strongly recommend you puchase my book on the 964 called Porsche 911 Enthusiasts Companion, from Bentley.
The entire system is explained, how to troubleshoot it what to look for etc etc.
Even checking the brake fluid level requires more than just looking at the fluid tank and saying, oh it is okay.
Ciao,
Adrian
Switzerland.
ken379

Posts: 2
Registered: 09/01/04
Re: Traction control and brake light on.
Posted: Sep 1, 2004 4:41 PM   in response to: Adrian in response to: Adrian
  Click to reply to this thread Reply
Thanks for the quick response, I have already bought your book and have pretty much read it cover to cover. My thought is to take it to a tech to have it looked at, because brakes are pretty important. Thanks again!!

Ken
Adrian

Posts: 15
Registered: 07/13/04
Re: Traction control and brake light on.
Posted: Sep 1, 2004 5:04 PM   in response to: ken379 in response to: ken379
  Click to reply to this thread Reply
Dear Ken,
I would tend to agree because most likely the problem is the pressure switch. Because the warn horn is coming on this tells me it is a pressure problem.
I would advise that you check the electrical system, battery voltage and the battery capacity. 964s eat batteries and if there is insufficient capacity in the battery this can cause the problem.
You do not actually say the exact circumstances of the two warn lights coming on and if they go out.
The traction control warn is telling you that there is insufficient pressure to guarantee operation.
Ciao,
Adrian
Switzerland.
batterycharger

Posts: 1
Registered: 11/15/09
Re: Traction control and brake light on.
Posted: Nov 15, 2009 9:53 PM   in response to: ken379 in response to: ken379
  Click to reply to this thread Reply
I have the some problem but mine is very intermittent. I only happens once in a while. If I stop and restart the engine the lights go out. Do you think it is the pressure switch?.
amandak695

Posts: 1
Registered: 08/23/10
Re: Traction control and brake light on.
Posted: Aug 23, 2010 3:38 AM   in response to: Adrian in response to: Adrian
  Click to reply to this thread Reply
Thanks you for the post.
__________________
watch free movies online
HighSpeedTraction

Posts: 1
Registered: 04/12/12
Re: Traction control and brake light on.
Posted: Apr 12, 2012 12:43 PM   in response to: ken379 in response to: ken379
  Click to reply to this thread Reply
I have a slightly different issue with my 964. Lights are off but the differentials feel like they remain locked. Very evident in sharp turns where there is a groaning sound. Could it be the battery? Other ideas?
PS. I did pop a fuse in the system when changing batteries but after replacing the 15 amp fude all warning lights were normal.
Thanks

Point your RSS reader here for a feed of the latest messages in all forums

Popular Discussions:
No popular dicussions.
Popular Tags