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Practical Goat
Newbie


Joined: 17 Jun 2019
Posts: 4



PostPosted: Tue Jun 25, 2019 1:48 pm    Post subject: 2006 Carrera 4S crap brakes Reply with quote

We've had a Porsche 997 in over the last few weeks which originally came in for a faulty roof - we traced this back to a water filled module under the seat for the rear electrics but have been unable to code it with our diagnostic gear. The customer has now given us job no.2 which is to sort a really rubbish brake pedal (over-servo assisted and spongy). It nearly goes to the floor and barely holds the car when in drive.

The brakes have been bled (pumped via brake pedal).

Is there a known issue? Special way to bleed these?

Thanks.
 
  
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jl-c
Monza


Joined: 22 Jul 2013
Posts: 244
Location: Shropshire


PostPosted: Tue Jun 25, 2019 1:54 pm    Post subject: Reply with quote

If you have got air in the ABS circuit you need to run the ABS pump bleed process. This can be done with Durametric but probably easier to use an indy unless you intend to buy a Durametric anyway.
https://www.hickleys.com/pdf/durametric_matrix.pdf
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We all do silly things/make mistakes, it's how we deal with them that sets us apart from animals and Americans.
 
  
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Practical Goat
Newbie


Joined: 17 Jun 2019
Posts: 4



PostPosted: Tue Jun 25, 2019 2:03 pm    Post subject: Reply with quote

Our Launch tool can communicate with the ABS pump - this may be the best option here. Thank you.
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7593
Location: Brighton


PostPosted: Tue Jun 25, 2019 6:48 pm    Post subject: Reply with quote

Unless there is a leak or work has previously been done on the brakes then air in the brakes would seem to be a bit unusual .

From your previous post i thought this was a hard pedal with almost no servo assistance so this is somewhat different to what i posted on that thread .

We use a pressure bleeder but the old fashioned way will work just as well although the poor person continually depressing the brake pedal might not feel like it lol .

Spongy brakes .. possibly air in the system .. so has the car had any work that would indicate that or are there any leaks ... if an abs unit has been replaced then you DO need a tester to operate it to bleed the system .

A brake flexi pipe ballooning .

A master cyl fault .

Try clamping each caliper in turn to see if a single caliper makes any difference .

Can't think of anything obvious regards to the servo .. if water ingress then i would expect more of a hard pedal to be honest .

The servo vacuum is generated via a tandem pump o/s/r but i'm struggling to see an over vacuum causing any kind of issue at all .

Fault code read out and if you can a drive link test of the abs system .. never seen an abs unit fail like this though .. water under the seat won't have any impact on an abs as that's under the bonnet .
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