Convert 3-channel ABS to 4-channel ABS Parts Question.

[Hobbes]

History:  Converting 2000 ABS 5.3 (3-channel) to 2002 ABS 5.7 (4-channel).

 

I have questions regarding brake line parts converting a 3-chanel ABS 5.3 to a 4-channel ABS 5.7.  I have looked through the PET catalog and identified the parts I believe I will need and I am looking for confirmation.  I do not want to not order a part due to an oversight or order incorrect parts. 

 

Graphic 1:

#7  99635532605  - brake line.  This part number supersedes 99635532604

#8  99635565027 - Intermediate piece.

 

Graphic 2:

#(18) 99635517711 - brake line.  This part number supersedes 99635517707

#(21) 99635576031 - connecting piece fourfold.  This will split the rear brakes, but allow me to run a second brake line from the rear to the front of the car - the 4th channel.

#(22) 99635557107  - vacuum line.  I am not sure if I need this part and that it already exists on a 2000 C2.  Can someone please confirm this or will I need this?

 

Graphic 3:

#(1) 99635518907 - brake line.  This part number supersedes 99635518906.

#(8) 99635519056 - brake line.  This part number supersedes 99635519052.

#(14) 99635557506 - vacuum line.   am not sure if I need this part and that it already exists on a 2000 C2.  Can someone please confirm this or will I need this?

Thanks

[Loren]

Have you reviewed the two diagrams (3 channel ABS vs 4 channel ABS) in the service manual.

If not, let me know and I will get those to you.

[Hobbes]

I did look at and compare the two diagrams.  In the 3-channel system, there is a "T" splitting the rear hydraulic lines compared to a the fourfold connector in the 4-channel system.  My assumption is the fourfold allows two brake lines from the hydraulic unit to come into a 'splitter' box that then runs to each of the rear brakes. 

 

One thing I do not see in either diagram is the vacuum line.  My attention was drawn to this due to the PET diagram and being associated with the intermediate piece.  I firmly believe the vacuum lines are already there based on PET and the service manuals, but I am not 100% sure this is the case.

[Best-Gear]

Hi

 

I have researched this too, and hope to get it all installed on my 986 this weekend... dont think its been done before.

[Hobbes]

I sent you a PM.

[The Radium King]

hi - any update? the mechanical swap seems straight forward, but wondering about the electronic side of things - the 2002 controller is canbus and the wheel speed sensors are different as well, so wondering if the 5.7 controller will even work with a 7.2 dme?

[Hobbes]

When I did my update, I converted my 2000 5.2 DME to the 7.2 DME.  Along with this conversion, I also changed out my ABS 5.3 to the ABS 5.7 Control Module.  This was primarily because when I converted my 2000 engine to the 2002 engine, I had to change out a number of things, the instrument cluster, DME and essentially all the electronics that go with the 2002 to include the ABS 5.7, wheel speed sensors, rear wiring harness, etc.  I did have to buy the car side electrical connector that fits into the 5.7 controller which required me to splice the wires from the car side into the new connector because I did not upgrade the front wiring harness.  This was problematic because the front wheel speed sensors connectors are different between the 2000 and 2002 as you said above.  Ideally, the front wiring harness that has the newer type connectors (staggered) is the way to go.  The rear wheel sensors are what's needed to register the speed on the instrument cluster.  All four sensors receive signals from each wheel for the ABS to work correctly and the ABS control module applies the appropriate level of 'breaking' to maintain control of the 911 in adverse driving conditions, aggressive driving, etc.

 

I hope this helps.  If you have more questions, let me know.

[The Radium King]

ok, so you changed the dme when you changed the abs controller. wonder if it is possible to just do the abs conversion.