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

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brake, brake line, master cylinder

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  #1  
Old 21st June 2019
T_worth T_worth is offline
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Default Front master cylinder wiper leaking

I had an issue with my brake switch, I thought maybe something was wrong with the piston. So I popped it out and put a new set in. I’ve tried to push the new wiper in the outlet gap of the master cylinder. I used a extended socket the same diameter and brake fluid to push in. I checked to make sure it’s seated all the way.

When I try to bleed my brakes, I don’t get any pressure with 100 pumps, I see tiny air bubbles coming out of the reservoir with the bleed screws tight. And the obvious sign is with a flashlight, I can see the leak from the ID of the wiper gasket along the piston cap.

What am I doing wrong??? How is the socket damaging the Wiper ID?
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  #2  
Old 22nd June 2019
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Toejam503 Toejam503 is offline
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Try cracking the banjo joint at the MC, that is where all the trapped air goes. Make sure you cover your tank, etc., it likes to squirt everywhere!
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  #3  
Old 23rd June 2019
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time to change piston cup and backup o-ring
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