problem with new master cylinder

Information and questions on GL1000 Goldwings (1975-1979)
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Posts: 4
Joined: Mon Mar 14, 2016 6:11 pm
Location: echo,mn
Motorcycle: 1979 gl1000, 1988 gl1500, 2001 gl1800, 1984 shadow 700, 1984 magna vf700c

problem with new master cylinder

Post by lpwing »

Hi guys. I'm new to the forum, and have a question about my front brakes on my 1979 GL1000. I bought a brand new front master cylinder for my bike off ebay since the original was shot. I get brake fluid to both calipers, but my brake lever feels soft compared to the original before it went bad. Any ideas please help

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Re: problem with new master cylinder

Post by virgilmobile »

2 possible things.
First bleed the air from the master cylinder at the banjo connection... then the furthest caliper then the closest one.Completely flushing all the old fluid out of the system.
If all the air bubbles are positively gone (use a mity vac if necessary),the brake lines may be deteriorating.
Under pressure,they may not be holding there diameter(bulging) accounting for a soft lever action.
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