alain-964c2

How is a slave cylinder failure detected? Is it dramatic? Gradual? Is the car still drivable?

I assume if the master cylinde fails, the clutch become inoperative.

Alain

Dave R.

You might try searching the archives on the 993 list. There've been a few exchanges on this issue there, and the 993 and the 964 use the same clutch slave cylinder.

Adrian

Dear Alain,
The master cylinder is under your foot. It is connected to the clutch pedal. These things very rarely fail and if they do you will know it because brake fluid will be pouring out of it normally. The seals fail. The slave cylinder is activated by the pressure fluid you provide from the master cylinder. A failing slave cylinder will cause problems with your gear changes. The slave cylinder actuating arm is what moves the clutch fork and moves the clutch into the flywheel or off the flywheel.
If the master or slave fail the car is either stuck in one gear or you cannot select a gear. One makes it partially driveable the other undriveable. If you are stuck in 1st and on the highway you are undriveable.
Ciao,
Adrian
964C4

Jeff Curtis

If you are referring to the brake master cyl. - then no.

The clutch master cylinder is located right at your clutch pedal and then a line runs to your slave cylinder, located on the left-hand side of your trans. bellhousing.

It is relatively easy to change out, easier if you disconnect trans. linkage and lower trans. via the mount - don't undo your motor mounts!

This will provide a considerable amount of clearance over attempting to change it without doing so.

The slave cylinder starts leaking and might work better if you bleed it, via the braking system reservoir located in your front compartment...it usually isn't obvious that it is in need of attention and most guys just "Easter Egg" it - meaning you change it out, hoping it fixes your issue...I have done the same.

I use a pressure bleeder, hook it up to the reservoir, clamp off the overflow line and pressurize...I then go around to all calipers and the clutch slave cylinder and bleed with a sports bottle that has a hose attached to it to catch the "mess".

More often than not, when an OPC/Dealership bleeds a C2 braking system, they skip bleeding the clutch slave cylinder - which annoys the HELL out of me!

Bluey964

I had my slave cylinder replaced about 3 months ago and it has made a very noticable difference to changing gear. The symptoms I was encountering were that it was particularly difficult to get the car into 1st gear, especially when warm. Reverse and 2nd were also "sticky". After having had the slave (and connecting pipe) changed, and the gearbox oil flushed and replaced the difference is night and day. It is a gradual thing, not a dramatic change.

It is now like a rifle bolt when changing gear - much as it left the factory I think (and the car has 83k on the clock!). In fact, it would go as far as saying it's now as smooth as a babies bottom.... :-)

i.

alain-964c2

Thanks everyone for the replys.

My car is 93 with 64k miles. The dealer said that changing the slave miight fix the hanging clutch pedal issue.

Any ideas on parts cost and how much time it require?

Alain

Kismet

ahhhhhhh Hanging clutch pedal issue !!!

Do a search on here first, there can be many reasons for that. If your dealer is a 964 specialist, he may know them and be able to inteligently fault find. Otherwise he may keep changing bits at your expense until he stumbles on the real cause.