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Old 07-13-2008, 07:23 PM   #1
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1997 SL
Dazed Bleeding clutch hydraulic system

I know, you aren't supposed to, AND there's a how-to somewhere, here is what I did today. This required about a quart of DOT 3. Most of it is wasted.

Clamp the M/C somehow so it won't move and is a few inches above the workbench surface. I put it in my bench vise (don't clamp it) and used bungee cords to secure it.

Remove the roll pin at the slave cylinder.

Put the slave in a qt. casserole dish or loaf pan.
Fill with brake fluid to submerge it.
Pull the line from the slave cylinder. Keep it submerged.
Bleed the lines by pushing the clutch rod into the MC.
When you retract the clutch rod, hold your finger over the end of the line.

Keep the MC full of brake fluid! So you don't introduce more air.

When you are satisfied that air is out of the lines:
Pump the slave (submerged) to work air out of it.
Reconnect the line to the slave cylinder (under brake fluid, so no air can get in)
Replace the roll pin, replace MC cap, reinstall in vehicle.

It seems that there is no way air can get into the system this way.

I think people do the same thing by removing the "clip" and piston from the slave, but that is difficult to do while holding it submerged.

97 SL. Born 6/5/97, bought 7/7/97
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02 Haro MTB- can't kill it, still trying though

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Old 07-13-2008, 07:25 PM   #2
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Default Re: Bleeding clutch hydraulic system

sooo...brake fluid is the secret ingredient in your casseroles and loaves? Brilliant!
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Old 06-03-2009, 01:43 PM   #3
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1996 SL2
Default Re: Bleeding clutch hydraulic system

Bleed Sealed master/slave in-car with no mess!

Originally Posted by 00 SLow View Post
I just finished going through hell chasing clutch problems after blowing a hole in the side of my bellhousing. After seeing lots of useful info about clutch related issues in the forum, I thought posting the directions that came with my new hydro assembly would be a be a useful addition. It's clean, dry, and doesn't require disassembling the slave.

I found it easier to bleed with the whole thing installed, with the slave hanging off the trans.

--- Twist the slave cylinder off the transmission, and point it vertically, with the pushrod facing the ground. With the cap off the reservoir, SLOWLY depress pushrod into the cylinder about an inch while watching the reservoir for bubbles. Repeat process until air bubbles no longer appear, usually about 10 to 15 strokes. With the cap still off, slowly press the pushrod in far enough to reconnect the bands on the retaining strap, if not already broken. Reinstall slave and replace the cap. Using short quick strokes, press the clutch pedal 20 to 30 times or until pedal is firm. Under normal usage, small anounts of air remaining will purge itself from the system. ---
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