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Sportster Motorcycle Tires, Wheels, and Brakes Discuss issues with Sportster motorcycle tires, wheels and brakes.

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  #1  
Old 25th May 2018
Jowniofownio Jowniofownio is offline
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Default Front brake won't bleed 1989 sportster

I have had the master cylinder in pieces and re sealed it the way it came out. I am now trying to bleed the brake and cannot get any fluid to leave the reservoir. Both holes are clear, the seals look good and I'm pretty sure it's built up as it sprang apart.

I would have thought that if the res was filled up and the hose off the master cylinder, fluid should slowly drain out through the small hole onto the floor. I'm not having any fluid leave the res. If I try bleeding it, nothing leaves the res. If I have it all connected up with fluid in re res and prime the piston and master, if I push back on the brake pads, the level of the res doesn't raise?

I'm very confused as never had issues bleeding brakes before

Any ideas?
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  #2  
Old 26th May 2018
decman decman is offline
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Fluid doesn't drain anywere when it is needed.

Put fluid in and "pump" the lever (Hand or foot) "a lot" before trying
anything else.
When you finally feel some resistance to the pumping 'then and only then'
do you resort to the normal bleeding process.
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  #3  
Old 4th June 2018
Jowniofownio Jowniofownio is offline
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Default

Right, used a vacuum bleeding tool to pull the fluid through. The front brake works a bit but if you hold the brake down, it goes hard then slowly pulls in towards the grip and I loose all braking whitch was a bit dodgy heading to the junction! Does this sound like air still in the system or passing seal? The seal looks good but may be old.

The rear brake, I'm having no luck getting a brake at all.

Any ideas?
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  #4  
Old 4th June 2018
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You put in a rebuild kit and did not change the seal. This rebuild sounds a bit dodgy to me.

I'd start over and do it right. This posted by a dude who who just did front and rear brakes on a 1980.
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  #5  
Old 4th June 2018
Jowniofownio Jowniofownio is offline
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Quote:
Originally Posted by rokytnji View Post
You put in a rebuild kit and did not change the seal. This rebuild sounds a bit dodgy to me.

I'd start over and do it right. This posted by a dude who who just did front and rear brakes on a 1980.
I didn't fit a new kit. Just stripped it and noticed the o ring was broken and replaced this. The cup seal hasn't been changed as looks ok. I have rebuilt it about 5 times now and this is the closest I have got it to working now.
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  #6  
Old 4th June 2018
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Uh huh.

Quote:
I have rebuilt it about 5 times now and this is the closest I have got it to working now.
Cool that it almost working. No details though on honing. Parts used. Etc.....

So I expect loosey goosey. Hell. I even cheated on mine. But I was not afeared to go into detail on what I did, and what I did not do. But I got broad shoulders and dgaf on what others think of my repair methods.
Since it is a personal thing < parts available, budget > for me out here in the wild west.
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  #7  
Old 4th June 2018
Jowniofownio Jowniofownio is offline
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Right, got a decent front brake now. Kept bleeding and finally got there. Now onto the rear....

I can't get anything there. Been bleeding for hours and nothing. Using the vacuum thing and it pulls fluid through but not building pressure. No obvious leaks and everything seems tight?
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  #8  
Old 21st June 2018
Jowniofownio Jowniofownio is offline
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right, I no longer have a front brake now!! If I give the brake leaver long hard pumps it stays solid and doesn't loose pressure. But if I give it soft slow pumps, and let out a bit then pump again, the leaver keeps coming in until it is at the grip and I don't have a brake! Could someone confirm that this is the master cylinder seals? Which could cause this as I have replaced the O rings just not the cup seal as that looks good. Or could it be a problem with the slide pins on the front brake caliper?
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  #9  
Old 22nd June 2018
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Quote:
Originally Posted by Jowniofownio View Post
right, I no longer have a front brake now!! If I give the brake leaver long hard pumps it stays solid and doesn't loose pressure. But if I give it soft slow pumps, and let out a bit then pump again, the leaver keeps coming in until it is at the grip and I don't have a brake! Could someone confirm that this is the master cylinder seals? Which could cause this as I have replaced the O rings just not the cup seal as that looks good. Or could it be a problem with the slide pins on the front brake caliper?
I Can't evaluate the pressure performance of a cup seal by eye, how can you? Cup seals can lose rigidity and/or elasticity which won't register by feel or by vision. The symptoms you are describing match a worn or degraded cup seal-- change it. If it doesn't fix your problem, it eliminates a suspect.
Just my $0.02 worth,
Joe
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