While I am there... replacing the starter I decided to replace the slave cylinder as well....

Two questions:

1. Do I need to use the hammer to bleed this? Or using my power bleeder should do the trick? I ask because my car is a C4 and for bleeding the brakes the hammer is needed to open the valves. I am guessing this is a separate system that just feeds from the same reservoir... but wanted to ask just to make sure.

2. PET gives me part no. 950.116.237.12 as the replacement part for the slave cylinder.... but when I got it from the dealer it is not the same as the one installed in my car... the one I have in the car has the hydraulic feed line going in the back and the new one its on the side... I will not be able to use the hard lines without bending them... Anyone has faced the same challenge?

Thanks in advanced for any help with this.

 

Dear Jaime,
You only need the power bleeder to bleed the clutch circuit.
What is the part number of the new unit they sent you? Cannot help you unless we find out what the new one is for. You may well have to replace the hydraulic line as well. A professional pipe bender can fix the pipe or you replace it with a high pressure flexible pipe or you find an adapter which would be my choice. Run a 90 degree connection off the new slave cylinder.
Ciao,
Adrian
964C4

 

Adrian, the part no. 950.116.237.12... that is what they gave me and that is what appears in the PET application... The weird thing is that it is just different from the slave cylinder installed in my car... I will have to see what this implies in terms of trying to use the existing line...

Thanks for your help.

 

Are you sure that the line going into the slave cylinder is a hard line? I'm pretty sure the line attached to the slave cylinder is a soft (flexible) line. It may be long enough to reach the different attachment point.
-Eric
90 C2
NER/PCA

 

Nope... it is a hard line that in turns attaches to a rubber line. I have been trying to find it in the PET diagrams to see if, along with the new slave cylinder, I can find the correct line and just buy it from Porsche.

I will post photos tonight.

 

Jamie, you have the wrong part!

The replacement sent to you should have the same connection for the flexible rubber line and a bleed screw mid-body.

Do NOT re-configure your hydraulic lines!

I replaced mine last Spring, no issues whatsoever with hydraulic line configuration/fitment. Used my pressure bleeder and bled unit along with all calipers...just for sport.

I got my replacement from Vertex if I remember correctly, give them a call and return that other slave cyl.

 

Jaime, your setup differs from that on my stock '90 C2.

I replaced my factory original slave cylinder earlier this year with a new one. I kept the original (which was identical to the new), and pulled it out after reading your initial post. It has the bleed nipple extending off the end opposite the piston/plunger, and the hydraulic feed comes in from the side, just like the one you purchased. The hydraulic feed line was flexible rubber with a threaded fitting, no hard line. Note that the 993's use the exact same slave cylinder as the 964's, which I offer as a datapoint to indicate that Porsche did not change the design.

Seems like you might have a non-standard setup? Whether a quirk from the factory or installed post purchase I don't know... Do your maintenance records indicate if the slave cylinder was ever replaced?

Good luck
-Dave

 

Dave, my point exactly. I went over the PET looking as far back as I could where hydraulic slave cylinders were used... nothing looked like what I have... and there is no record of the slave cylinder being replaced... Everything looks original... wonder if the car being a import from Sweeden has anything to do with it...

Let me go out and take a few photos...

 

Well... I am not crazy. Here is what my car has:



It is the same slave cylinder shown in the workshop manual... let me scan that photo...

 

Here is the photo from the workshop manual:



Soooo... along the way Porsche changed this part.

 

and for reference.. here is the new one:

 

Hmmmmmm, that explains my confusion. The slave cylinder us C2 people are talking about is the Clutch slave cylinder, it goes directly across from the starter along the top of the gearbox case........

The slave cylinder you are showing is for the 4 wheel drive "stuff", it is listed as the "lock control" operating cylinder on my PET, and has a 928.332.775.12 number...... (the C2 gearbox, has a blank off over that mount)

-Eric

 

Dear Jaime,
It helps when you post to exactly identify what you are changing. The use of the word "slave cylinder" is normally used for the clutch slave cylinder.
The differential lock slave cylinders should be identified as such.
Now please tell us which slave cylinder you are changing and which one you are looking at.
The clutch slave is a 950 part number.
The lateral lock slave cylinder as shown in the diagram above is a 928 part number and the longitudinal lock which is exclusive to the 964 C4 is a 964 part number.
From what I can decode from your post is that you are trying to change the lateral diff lock slave cylinder with a clutch slave cylinder and that will not work.
Ciao,
Adrian
964C4

PS: If you are replacing a diff lock slave cylinder then you need the Bosch hammer to bleed them.

 

Yup, I'll admit, I reviewed the new threads last night before going to bed...and I gotta say, I was thrown for a loop!

Now it all makes sense, I was in a "C2 frame of mind" and assumed you were talking CLUTCH slave cylinder!

Good luck in whatever unit you decide to change! I would keep the clutch slave cylinder that you apparently have on hand...and change that, power bleed the system and be done with it.

WHY are you changing out your diff. lock slave cyl.??

 

Because I had no clue it was the diff. lock slave cyl....

I will not be changing that...

Best to start looking on the other side of the car for that CLUTCH slave cylinder

Please pardon the confusion... live and learn...