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Bleeding Clutch - Master Cylinder Cap o-ring busted

 
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Old 01-06-2014, 03:31 PM
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Bleeding Clutch - Master Cylinder Cap o-ring busted

So I have a 91 si 5 speed, b21 engine.

My Slave cylinder was leaking so I replaced that but I can't get any pressure in the line. I've tried bleeding it but it seems like no fluid is getting to the slave cylinder.

I just purchased the master cylinder and I'm going to replace that tonight. I'm not seeing any leaking at the master but it doesn't seem to be doing its job so I figured I would give this a shot.

One thing though...the o-ring on the master cylinder cap for the reservoir is broken. It is missing about 1/4th of the ring around the seal. Does this have to be air tight? Is this why I'm not able to get fluid to the slave? My thinking is that as long as the reservoir is full it's creating the vacuum even with the leak at the o-ring. I've tried creating a seal by putting a rubber glove in between the cap and the reservoir.

What do you think the problem is?
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Old 01-06-2014, 05:35 PM
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Re: Bleeding Clutch - Master Cylinder Cap o-ring busted

It takes a lot of pumping the pedal to get the air out of the system. Just keep at it. The first time I did that I thought the same thing as you. I had to pull the pedal off the floor for what seemed like forever. But I finally started to feel a little pedal, and gradually it got better and better.

The o-ring doesn't have anything to do with the operation of the clutch. It will work with the lid off in fact. It's purpose is to keep moisture out of the clutch (brake) fluid. Brake fluid pulls moisture out of the atmosphere and into the fluid. Once you get enough moisture in the fluid it will start to rust things in the system. Which will cause the parts to fail prematurely. This is why brake systems (and hydraulic clutch systems) should be bled every two years or so. It's also why you shouldn't use brake fluid from an unsealed bottle that's been sitting for a couple of years.
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Old 01-06-2014, 06:01 PM
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Re: Bleeding Clutch - Master Cylinder Cap o-ring busted

Luzer,
When you were bleeding your lines and in the beginning when you weren't getting any pressure did you still see air coming out the bleed valve on the slave? I have a tube set up on the bleeder valve and I expected to see some air come out at least but it's like nothing is pumping when I pump the clutch.
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Old 01-06-2014, 06:53 PM
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Re: Bleeding Clutch - Master Cylinder Cap o-ring busted

mine was the master cylinder that went bad and no fluid. My clutch disk also had a spring that shot out in the tranny tooooo but well
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Old 01-06-2014, 07:33 PM
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Re: Bleeding Clutch - Master Cylinder Cap o-ring busted

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Originally Posted by Ngionti1 View Post
Luzer,
When you were bleeding your lines and in the beginning when you weren't getting any pressure did you still see air coming out the bleed valve on the slave? I have a tube set up on the bleeder valve and I expected to see some air come out at least but it's like nothing is pumping when I pump the clutch.
I honestly can't say. I just had a piece of tubing on the bleeder which was running to a drain pan. It wasn't submerged so I couldn't see any bubbles. But I would expect to see air coming out even at the beginning. Otherwise it would be a waste of time.

You could always try to gravity bleed it. I've been wanting to try that since I first read about it, but I haven't needed to bleed my clutch since reading about it. Here's a link for how to do that...
DIY: Clutch Bleed (Gravity Method) - S2KI Honda S2000 Forums
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Old 01-06-2014, 08:29 PM
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Re: Bleeding Clutch - Master Cylinder Cap o-ring busted

Most master cylinders say to bench bleed first before hooking the lines up to it. Otherwise you'll be pumping that pedal for a while and the air will still be in the lines. I just pumped it about 100 times slowly before grabbing my daughter to help while I started bleeding it at the slave cylinder.
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Old 01-07-2014, 07:21 PM
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Re: Bleeding Clutch - Master Cylinder Cap o-ring busted

Well it turns out bleeding the lines takes longer than expected. Just kept at it and finally got pressure built up. No need to replace the master cylinder. So newb advice...just keep at it if you're having trouble bleeding. It'll get there.
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Old 01-09-2014, 11:41 PM
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Re: Bleeding Clutch - Master Cylinder Cap o-ring busted

les paul is right you have to bench bleed the new master cylinders' i had the same thing happen to me.... i had it all installed and together which is a pain in the butt if you've tried to put that metal line back on the bottom.... had to take it back apart and bench bleed it and once i did that... it worked perfectly.... but i think i need a new clutch... it's not as strong as it should be.... lol
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Old 01-10-2014, 11:06 AM
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Re: Bleeding Clutch - Master Cylinder Cap o-ring busted

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Originally Posted by andrewlude88 View Post
les paul is right you have to bench bleed the new master cylinders' i had the same thing happen to me.... i had it all installed and together which is a pain in the butt if you've tried to put that metal line back on the bottom.... had to take it back apart and bench bleed it and once i did that... it worked perfectly.... but i think i need a new clutch... it's not as strong as it should be.... lol
It's not required to bench bleed a new master cylinder. Mine works perfectly fine and I didn't bench bleed it. And now it sounds like the OP has his working too without bench bleeding. It's fine to recommend to people that they do that before installing the thing, but please don't make it sound like you have to remove and bench bleed it if someone didn't first do that before they installed their master cylinders. It does take a lot more pumping if you don't, but it will work just as well after all the pumping.
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Re: Bleeding Clutch - Master Cylinder Cap o-ring busted

I just got my clutch working after replacing the slave and master cylinders. I didn't bench bleed the master cylinder. I simply got a wet vac and made me a fitting and taped it to the end of the hose on the wet vac. Then I put it on the bleeder valve on the slave cylinder then I turned the wet vac on and then I loosen the bleeder valve and then after about 10 minutes of it running I pumped the pedal about 4-5 times real fast and then it made like burping sound and the clutch reservoir instantly went empty so I filled it back up and tighten the bleeder valve up and unhooked the wet vac and got in the car and pumped it another 10 more times and the clutch is perfectly fine now. It sure beats the crap out of doing all manually pumping.
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