80Q Clutch slave cylinder

Hoyle · 03-12-10, 10:33 AM

I'm having a few issues with the 80q which i think are down to the slave cylinder.

Hopefully someone could advise on what to look for and where to source a new cylinder.

The issue I've had was over 24 hours the top half of the clutch pedal got lighter and lighter until the only resistance was right at the bottom of the pedal and I could no longer select gears (as if air had got into the system).

I checked the fluid reservoir for the clutch and it was empty, suggesting a leak, so I've topped this up anyway.

There doesn't seem to be any visible leaks around the footwell (don't want to rule out master cyl yet) nor are there any visible leaks around the bellhousing (could be internal).

Is it worth attempting to pressure bleed the system anyway to see if i get a pedal back?

Also where's best to purchase either cylinder from? I've found a slave at GSF, £23.50 plus vat & postage, but I've no idea on the quality or brand.

Any tips for looking or checking at all? Or even tips of how best to go about swapping the cylinder? I've read Phil Payne's guide and it seems straight forward, but fiddly/awkward!

Hoyle.

Hoyle · 05-12-10, 12:06 AM

Anyone info would be greatly appreciated.

Hoyle · 05-12-10, 07:33 PM

Update: Pressure bled the system today and it seems to be ok now, perhaps it took a little air in? I don't know.

The fluid level hasn't dropped yet so i may be lucky for now. Slave cyl ordered and will remain on standby!

urS6 · 06-12-10, 06:01 PM

I went through two master cylinders on my 80q, but it was still on the original slave when I scrapped it at after 120k miles of ownership. I remember lying on my back in the driver's footwell wrestling with some wretched washer at the end of a pliers trying to get it on to a shaft. I think I swore quite a bit - didn't seem to help. I was covered in brake fluid - even my hair.

Check (run your fingers over the bottom of the master cylinder) for leakages.

The slave is a bit of a bugger to get to as well, as I think that's where the bleed nipple is.

BIGGYIN · 06-12-10, 06:57 PM

Can you still get repair kits,for both cylinders?If so,where?
Thanks.

urS6 · 06-12-10, 11:38 PM

Both master and slave cylinders (non OEM) used to be pretty cheap, and even the OEM ones were affordable. Also, on the 80q, the walls of the master cylinder were a bit pitted - could possibly have been honed, but probably not worth the effort.

In the case of the S6s, I think I've done four master cylinder replacements in about 200k of ownership - one was leaking hydraulics, and three were bent or snapped rod problems.

Paul

05-12-10, 12:06 AM	#2
Hoyle 80q addict Classic Audi Club Member Join Date: Nov 2010 Location: North Wales Posts: 840	Anyone info would be greatly appreciated. __________________ My 80 Quattro thread

05-12-10, 07:33 PM	#3
Hoyle 80q addict Classic Audi Club Member Join Date: Nov 2010 Location: North Wales Posts: 840	Update: Pressure bled the system today and it seems to be ok now, perhaps it took a little air in? I don't know. The fluid level hasn't dropped yet so i may be lucky for now. Slave cyl ordered and will remain on standby! __________________ My 80 Quattro thread

06-12-10, 06:57 PM	#5
BIGGYIN 4 ring whore! Classic Audi Club Member Join Date: Mar 2009 Location: Merseyside Posts: 7,976	Got one years ago. Can you still get repair kits,for both cylinders?If so,where? Thanks. __________________ q90 B2 Type 85 - q90 B2 Type 85-PROJECT-ABY 20vt KARL. Injection is nice but I'd rather be blown

06-12-10, 06:01 PM	#4
urS6 Grown up member Join Date: May 2010 Location: Worcestershire Posts: 115	I went through two master cylinders on my 80q, but it was still on the original slave when I scrapped it at after 120k miles of ownership. I remember lying on my back in the driver's footwell wrestling with some wretched washer at the end of a pliers trying to get it on to a shaft. I think I swore quite a bit - didn't seem to help. I was covered in brake fluid - even my hair. Check (run your fingers over the bottom of the master cylinder) for leakages. The slave is a bit of a bugger to get to as well, as I think that's where the bleed nipple is.

06-12-10, 11:38 PM	#6
urS6 Grown up member Join Date: May 2010 Location: Worcestershire Posts: 115	Both master and slave cylinders (non OEM) used to be pretty cheap, and even the OEM ones were affordable. Also, on the 80q, the walls of the master cylinder were a bit pitted - could possibly have been honed, but probably not worth the effort. In the case of the S6s, I think I've done four master cylinder replacements in about 200k of ownership - one was leaking hydraulics, and three were bent or snapped rod problems. Paul