Clutch Hydraulic Failure?

[dlipka]

Hi - I was driving my 2001 TT the other day and on a second to third shift, I pressed the clutch pedal down and it stayed stuck to the floor, but the clutch did not disengage. I slowed and the engine eventually stalled and I came to stop (car in third gear, clutch pedal 'locked' to the floor). It felt as if the gear lever was locked in gear, but with a good yank, it popped into neutral and and all gates appear to be there (and car rolls). By hand, I pulled the clutch pedal off the floor and now it is in the normal position, but rock hard - I can't push it down at all.

Any suggestions?

Thanks,

Derek

[wross996TT]

First question is fluid level? Then my guess is clutch Slave & Accumulator.

[dlipka]

First question is fluid level? Then my guess is clutch Slave & Accumulator.

Fluid level is fine (full) - I guess that surprised me a little bit.... What does the accumulator do?

[jpflip]

Accumulator consist of a reservoir with a rubber membrane that divide the reservoir in two sections. On one side there is pressurized air and on the other side clutch fluid. (Pentosin) When you start the car the steering pump pressurized the fluid inside the accumulator and provide you with extra clutch application in case of drop of pressure. This is done by the air under pressure on the other side of the membrane. I guess Porsche engineers installed these accumulators to backup the steering pump when engine idling...

[jpflip]

There is a test as per Repair Manual for the accumulator:

1. Checking accumulator

1. Cold start engine (accumulator temperature approx. 20°C) and let run for approx. 20 seconds

(accumulator is full).

2. With the engine switched off, depress the clutch pedal repeatedly until an abrupt rise in pedal resistance

against your foot can be felt (accumulator is empty). While doing this, count the number of depressions

carried out up to the point of the rise in pedal pressure!

3. If the number of times the pedal was depressed is over 35, the accumulator is faulty and must be

replaced!

Accumulator part# 996 314 166 00 price about $120.00

Clutch slave cylinder part# 996 116 237 52 price about $430.00

I also made a DIY Clutch slave cylinder and accumulator replacement