(3) ABS Portion - Seek Advise, as I am still studying the ABS Harness & 993 RS Piping differences, between the Electro-Hydraulic 964 C4 / 993 C4 / 993 RS
ABS Control Unit (Electro-Hydraulic): 964 C4 to 993 RS
964 RS/C4: 964.618.126.01
993 RS/C4: 993.618.127.00
Question 1 (Wire Harness): What 964 / 993 variants, can interchange?
-> Would 964 C4 or 993 C4S harness work.
-> or 993 RS use a C2, due to G50 (maybe not, due to vacuum & hydraulic.).
ABS Booster Pump (Electro-Hydraulic): 964 C4 to 993 RS
964 RS/C4: 964.355.053.52 (964 have power boost ratio: 4.8)
993 RS/C4: 993.355.053.50, 993.355.953.02 (993 have power boost ratio: 3.6)
Note 1 (interchange): Interchangeable for 964 & 993 C4/C4S/TT (supersede).
ABS Hydraulic Pump (4 Channel): 964 C4 to 993 RS
964 RS/C4: 964.355.955.00
993 RS/C4: 993.355.955.50
Question 1 (Wire Harness): What 964 / 993 variants, can interchange?
-> Would 964 C4 or 993 C4S harness work.
-> or 993 RS use a C2, due to G50 (maybe not, due to vacuum & hydraulic.).
Question 2 (Pipings/Brake Lines): Is the 964 C4 the same as 993 C4S and 993 RS (for both the above Part Numbers)?
ABS Master Cylinder (25.4mm): 964 C4 to 993 RS
964 RS/C4: 964.355.025.52 (20.6mm).
993 RS/C4S/TT: 993.355.903.00 (25.4mm).
Question 1 (Wire Harness): Are there any Harness needed (I assume it’s fully mechanical & no Harness needed)?
Question 2 (Pipings/Brake Lines): Could the 993 C4S and 993 RS Piping, be identical (assuming 964 C4 is totally different, in both Pipe Size and Piping Layout)?
Brake Calipers (996 C4/TT): 964 C4 to 993 RS
I’ve temporarily re-used the 996 set (matched bias ratio), that the previous owner installed.
This Axial/Radial mount-type, did not affect the rear parking brakes issues.
I’ll study more on how factory 993 RS works, but I’m guessing it uses a smaller rotor.
*Do note of some differences in supersede part numbers, and variations from early/late 964C4, hence please do your due diligence to check.
I learnt from many expensive mistakes, such as not adjusting my 964 C4’s Side Member, before cutting my GT2 Tie-Rod to fit…
**This 964 rear suspension’s top-mount was modified to 993, by previous owner and works great till date (I’ve read some online research, that many have also done this forward date, from 964 Semi-Trailing Arm, to 993 Multi-Link Design).
Hope to seek your kind advise and apologies on the long posting.
Really hope to seek any advise at all, as I hope to replace to factory 993 RS ABS Harness and 993 RS Pipings (as a 1 make 993 3.8 RS setup).