Rear brake issue on new build

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monkeywrench202
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Rear brake issue on new build

Post by monkeywrench202 » Sun Mar 25, 2012 12:54 pm

loss of brake pressure
Hey guys,

I am having an issue I have never had before. I have bleed 100's of systems thru the years, but this one just makes no sense.

Rear line, 4 piston Wilwood caliper, standard HD softail Master cylinder, pressure switch for brake line inline.

No matter how much I bleed this thing, I cannot keep pressure. if you spike the pedal, it has great pressure and grabbbing power, but if you gently push the pedal, it sink to the bottom w/ zero resistance. If spiked, it will hold also, no bleed down/ sink.

Light works when spiked, but not when pushed slowly?

Any ideas?

I have bleed and bleed, no air is coming thru, it solid clean fluid.

Been considering a Pheonix tool bleeder, but never needed one B4?

Thanks

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yona
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Re: Rear brake issue on new build

Post by yona » Sun Mar 25, 2012 3:10 pm

Look to the MC....something is letting fluid bleed past the seals .... do these Mc's have a bypass built in ..... ???
I.D.G.A.F.H.T.D.I.A.O.C.C.

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curt
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Re: Rear brake issue on new build

Post by curt » Sun Mar 25, 2012 7:38 pm

ive had that problem on the front useing the small master 9/16 switched to 11/16 was fine but i have noticed sometimes useing harley brake parts with aftermarket can sometimes do that might think about switchin to a better master let us kno what u find
ever notice when you hit somethin or someone with a hammer you feel instantly better

monkeywrench202
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SELF INTRODUCTION: I was a memeber on the old site, but couldnt log in here. I have a small shop where I do resto/ mods, build complete bikes (6 to date) ground ups. Been working @ Drive train specialists since 02 building custom automotive axles.

Re: Rear brake issue on new build

Post by monkeywrench202 » Sun Mar 25, 2012 9:05 pm

Do you have a recommended MC that fits FLST floorboard mounts? 1996 style floorboards?

Russ
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Re: Rear brake issue on new build

Post by Russ » Mon Mar 26, 2012 3:26 pm

Might be the seals. It's not unknown for 'soft' seals to get past quality control.

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curt
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Re: Rear brake issue on new build

Post by curt » Mon Mar 26, 2012 7:10 pm

im not sure floorbords are a definate pain in the ass cause your locked in to the master that attaches to the frame unless u make a custom bracket then you can run about anything you want
ever notice when you hit somethin or someone with a hammer you feel instantly better

monkeywrench202
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Joined: Wed Oct 26, 2011 8:44 pm
SELF INTRODUCTION: I was a memeber on the old site, but couldnt log in here. I have a small shop where I do resto/ mods, build complete bikes (6 to date) ground ups. Been working @ Drive train specialists since 02 building custom automotive axles.

Re: Rear brake issue on new build

Post by monkeywrench202 » Sun Apr 01, 2012 8:57 pm

Must have been a Monday or Friday MC. fragments of crap in it. Rebuilt the MC and got the best brakes I have ever had on a scoot.

Thanks guys!!!

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curt
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SELF INTRODUCTION: hi everyone its me from the old bord hopeing to see everyone come here and all the newcomers . lets make this as good as the old one or even better . lookin foreward to seeing everyones projects continue and ill be continueing mine too
Location: utica new york

Re: Rear brake issue on new build

Post by curt » Sun Apr 01, 2012 9:47 pm

cool glad ya got it going
ever notice when you hit somethin or someone with a hammer you feel instantly better

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