How to bench bleed??
Thread Starter
Racer
Joined: Jan 2007
Posts: 253
Likes: 0
From: Winter Haven Florida
How to bench bleed??
Hey Guys,
Sorry for the easy question, but all my searches turned up squat. Every thread I got talked about bench bleeding, but the poster already knew how. I'm really lost here. Is there a thread or write-up on HOW to bench bleed a MC??
TIA,
Josh
Sorry for the easy question, but all my searches turned up squat. Every thread I got talked about bench bleeding, but the poster already knew how. I'm really lost here. Is there a thread or write-up on HOW to bench bleed a MC??
TIA,
Josh
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
run a plastic hose from each m/c outlet so that it loops into the fluid resevoir, and slowly push the piston several times until there are no more bubbles. just keep the end of the plastic hoses submerged in the fluid. you should have gotten a kit with your m/c.
Thread Starter
Racer
Joined: Jan 2007
Posts: 253
Likes: 0
From: Winter Haven Florida
I didn't get it new and installed. I was stupid and paid a shop to do it. Now I've had to go back and redo everything else and I drained the MC. I cleaned it out and painted it, so it's now empty.
I can find the tubes and understand how it will work now. I only have one question. When you say the piston, do you mean the shaft that is coming out the back into the booster? I just pump that in and out until no air bubbles? What keeps the fluid from going into the brake lines.
Sorry I'm very green at this...
Josh
I can find the tubes and understand how it will work now. I only have one question. When you say the piston, do you mean the shaft that is coming out the back into the booster? I just pump that in and out until no air bubbles? What keeps the fluid from going into the brake lines.
Sorry I'm very green at this...
Josh
Drifting
Joined: Apr 2002
Posts: 1,716
Likes: 4
From: New Baden Illinois
You want to fluid to go into the lines. You have to attach the tubes to the brake line outlets on the side of the M/C. Then take the other end of the tubes and put them in the top of the M/C. Fill the M/C with fluid. Making sure that the ends of the tubes stay submerged, you need to take a rod and pump the M/C. You will see bubbles coming out of the tubes back into the fluid. You need to continue this until you cannot see any hint of air coming out of the tubes back into the brake fluid. Once that is achieved, mount it on the car.
This is best done if you can put the M/C in a vise.
This is best done if you can put the M/C in a vise.
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
josh
that's what the plastic hoses are for. you disconnect the main brake lines and insert the plastic hoses where the main lines were screwed in. when you disconnect the main lines, you will introduce air inthe the main lines, so you'll have to rebleed everything. your best bet is to get a motive pressure bleeder and bleed the m/c and lines at the same time. just did mine this way, and it took only about 15 minutes.
that's what the plastic hoses are for. you disconnect the main brake lines and insert the plastic hoses where the main lines were screwed in. when you disconnect the main lines, you will introduce air inthe the main lines, so you'll have to rebleed everything. your best bet is to get a motive pressure bleeder and bleed the m/c and lines at the same time. just did mine this way, and it took only about 15 minutes.
Melting Slicks
Joined: Jul 2005
Posts: 2,060
Likes: 46
From: winter haven florida
St. Jude Donor '12
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Instructor
Joined: Jan 2007
Posts: 219
Likes: 0
From: Wilmington NC
I have been told to use the eraser of a pencil to bench bleed the MC, not a screwdriver. Something about the pencil is softer and you stand less of a chance of damaging the MC. Don't know if this really matters or not, but that is what I did.
-Shark Mann
-Shark Mann
Burning Brakes
Joined: May 2005
Posts: 1,145
Likes: 5
From: South of London, Engerland
I'll be bench bleeding a new master cylinder in the next couple of weeks, and I think I understand the process. I have one question though:
When I install the freshly-bled m/c in the car, I have to unscrew the bleeding pipes and fit the pipes for the car's brake circuits. When I unscrew the bleed pipes, what stops nasty brake fluid from running out all over my car?
When I install the freshly-bled m/c in the car, I have to unscrew the bleeding pipes and fit the pipes for the car's brake circuits. When I unscrew the bleed pipes, what stops nasty brake fluid from running out all over my car?
Le Mans Master
Joined: Apr 2004
Posts: 7,106
Likes: 38
From: Newark DE
nothing should come out of the line connectors as long as you don't push the piston in. You MAY get a dribble of a drop or two of fluid but that should be about all.
Just cover the fender and everything else nearby with towels, etc as you move the MC onto the car since brake fluid will take paint off faster than you can blink.
Just cover the fender and everything else nearby with towels, etc as you move the MC onto the car since brake fluid will take paint off faster than you can blink.
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
nothing should come out of the line connectors as long as you don't push the piston in. You MAY get a dribble of a drop or two of fluid but that should be about all.
Just cover the fender and everything else nearby with towels, etc as you move the MC onto the car since brake fluid will take paint off faster than you can blink.
Just cover the fender and everything else nearby with towels, etc as you move the MC onto the car since brake fluid will take paint off faster than you can blink.
