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New MC - Need to bleed

  • Thread starter Thread starter CCM911
  • Start date Start date
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CCM911

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I just picked up a used front Master Cylinder for my 1983 GS1100ED. So I took off the grungy, leaking old one, and replaced it with the "new" one. So I thought I could do a gravity bleed at the banjo bolt, in order to ascertain the condition of the new MC, to be followed by a fluid flush at a later date.

Problem is that no fluid is going through. When I did my Ducati Clutch master/slave, I was able to do a gravity bleed.

Why can't I do the same on my GS1100?

Thanks so much for reading.
 
Use a mighty vac if available and ever so slightly wiggle the lever. Wiggling will let little air bubbls escape out them fluid return hole.

Some auto parts places with tool rentals will have the brake bleeders.
 
If you're pumping and no fluid is moving out of the reservoir and into the line, the MC needs to be primed first. See this: http://members.dslextreme.com/users/bikecliff/images/brakes_odds-n-ends.html#A04

In theory, you should be able to bleed the system just by pumping the brake lever and manipulating the bleeder screw as necessary. In reality, this sometimes doesn't get all of the air out and you need a source of vacuum to draw the fluid through the system faster than it can be moved by pumping the lever.

Chuck mentioned the mighty vac but if you're cheap like I am, you may be able to get the job done with a $1 large medical syringe: http://www.thegsresources.com/_forum/showthread.php?t=205846
 
The BEST bleeder I have used is one I bought at Harbor Freight Tools. It requires an air compressor but it really sucks any air and fluid fast.It's about $30 and functions exactly like the $150 one we used at the shop.
 
Lets say you put on new master and the lever had no tension at all. Does that mean i put it together wrong?
 
You gotta prime it first.

Sometimes the process is also called "bench bleeding".
 
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