Tech Question: Clutch

Reply Subscribe

Thread Tools

Search this Thread

Sep 24, 2014 | 09:00 PM

johnodrake

Thread Starter

Moderator

Joined: Dec 2002

Posts: 40,891

Likes: 4,345

From: Lakewood Ranch, FL

Tech Question: Clutch

In my 06C6 GS Clone, the clutch pedal will bleed down after sitting a while and release the clutch just off the floor. It will also do this while driving. I can pump the pedal and it will return to normal for a time then bleed down again.

It is not the same thing as the clutch pedal staying on the floor after a shift. I have been routinely changing the fluid (Motul RBF600) using the "Ranger Method" for years now and doing this fluid change has seemingly no affect on the problem. I am thinking a leaking seal in either the master or the slave cylinder.

There is no fluid leaking out anywhere and the fluid level in the reservoir remains constant.

The master and the slave cylinders are OEM stock but the Clutch is an RPS dual friction.

Any thoughts?

Sep 24, 2014 | 11:21 PM

dev1360

Burning Brakes

Joined: Jul 2013

Posts: 823

Likes: 7

From: Rosewood Heights IL

Bad Master. Replace with stock, or Tick if you desire, but stock is more than adequate.

If you had fluid loss I would say the slave. But no fluid loss is the master.

Sep 25, 2014 | 07:06 AM

high9s

Instructor

Joined: Sep 2007

Posts: 237

Likes: 7

You have an RPS clutch, protect it with a Tick master. It moves 5 times more fluid than stock, (I bled mine in 5 pumps) Its just my opinion, but go with the tick master, you will be glad you did.

Sep 25, 2014 | 07:40 AM

dev1360

Burning Brakes

Joined: Jul 2013

Posts: 823

Likes: 7

From: Rosewood Heights IL

McLeod warns against the Tick because of over-extension of the pressure plate.

If everything is spaced and working properly, "moving five times more fluid" doesn't do anything.

Sep 25, 2014 | 08:15 AM

high9s

Instructor

Joined: Sep 2007

Posts: 237

Likes: 7

Quote:

Originally Posted by dev1360

McLeod warns against the Tick because of over-extension of the pressure plate.

If everything is spaced and working properly, "moving five times more fluid" doesn't do anything.

I am running a Mcleod RXT clutch With a Tick master. If you talk to Mcleod your quote only pertains to people running Mcleod throw out bearings with a Tick Master cylinder.

I am using a stock GM throwout bearing.

If everything was spaced and working properly the OP wouldn't have a problem.

Sep 25, 2014 | 02:02 PM

johnodrake

Thread Starter

Moderator

Joined: Dec 2002

Posts: 40,891

Likes: 4,345

From: Lakewood Ranch, FL

Thanks for the input guys. 'Preciatet it

Sep 25, 2014 | 07:56 PM

cclive

Team Owner

Joined: Mar 2008

Posts: 21,502

Likes: 461

From: Southern Utah

I agree with dev1360 that it is likely the master cylinder...worn but not gone....but soon to go. Conceivably it could be the slave, but since the master is more likely and less (much) expensive and easy to replace, do that first. If done carefully, bleeding will not even be necessary.

Sep 25, 2014 | 11:10 PM

Dano523

Race Director

Joined: Dec 2013

Posts: 12,502

Likes: 3,629

After install bleeding for the master cylinder, no since the system will purge small air bubbles as you are driving it.

But you still want to bench bleed the master cylinder before you install it.