Master cylinder bleed

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Scrimhorse
Posts: 20
Joined: Fri Oct 22, 2004 3:34 pm
Location: Hertfordshire UK.

Master cylinder bleed

#1

Post by Scrimhorse » Tue Jun 29, 2010 9:14 pm

Hi it has been a while.
Restoration of 1965 Electra Glide is going well.At the moment i am having trouble bleeding the master cylinder after fitting new repair kit.I have tried two repair kits but got the same result.it will not pump fluid.Can any one help??????.



NightShift
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Re: Master cylinder bleed

#2

Post by NightShift » Tue Jun 29, 2010 11:03 pm

Dear Scrimhorse,
Did your kit have a little check valve that looks like a little aluminum hard hat in it? Kits for late models dont.
If it did and its a good one maybe, then sometimes getting the bubbles out is easiest with a pumper oil can with a tube to push fluid in from the wheel backwards until the bubbles come out the front.
BRAKPUMP.jpg
Whatever works,
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PanPal
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Re: Master cylinder bleed

#3

Post by PanPal » Wed Jun 30, 2010 12:49 am

Sometimes you can just bungy cord the pedal in the depressed position overnight and it will bleed the bubbles out also. Not sure how well this will work with the rear cylinder but I have done a few of the handle bar mounted brake cylinders this way with good results.

socalrider
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Re: Master cylinder bleed

#4

Post by socalrider » Wed Jun 30, 2010 2:18 am

rig up a piece of old brake line.fill the resevoir and bleed the master cylinder into a container with brake fluid in it, making sure the end of the brake line is in the jar with the brake fluid and into the fluid. this forces fluid into the master cylinder when you release after depressing to bleed.do the pump, release cycle enough times that bubbles stop coming out of the brake line . this method has always worked for me on both disk and drum brakes.
arnulfo

4pans1man
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Re: Master cylinder bleed

#5

Post by 4pans1man » Wed Jun 30, 2010 2:52 am

Horse,

I've found that over the years of use on those old master cylinders, that they get "egg" shaped from wear. No matter how many rebuild kits you install, the brake fluid still bleeds around the piston cup. I have about 2 dozen of them that won't pump up or bleed. I'd look for a "nos" or remake and call it a day. The chrome cover will hide it anyway.

Best of luck, Tony.

Scrimhorse
Posts: 20
Joined: Fri Oct 22, 2004 3:34 pm
Location: Hertfordshire UK.

Re: Master cylinder bleed

#6

Post by Scrimhorse » Sat Jul 03, 2010 8:30 pm

Thanks All.
I have taken all your information on board and will try it all untill something works.
Will keep you posted. Meanwhile back at the Ranch,looking forward to our Bikes & Barges custom bike show 4th July V Twin/Harley,it is our second year. It takes place in one of our small seaside towns in the county of Essex, Maldon in fact,the Mayor will be there again & i hope will enjoy himself. It is in a good cause for local charity.Check us out. Not sure if i can post our web site so i wont. We are not selling anything, just a bunch of guys & gals having a good time.
Regards Scrimhorse.

NightShift
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Re: Master cylinder bleed

#7

Post by NightShift » Sat Jul 03, 2010 10:05 pm

Dear Scrimhorse,
We in the USA are very honored that you would observe our Independence holiday,

Time heals all huh!

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