problem with new master cylinder


Information and questions on GL1000 Goldwings (1975-1979)
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lpwing
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

Postby lpwing » Mon Mar 14, 2016 6:30 pm



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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virgilmobile
Posts: 7659
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: problem with new master cylinder

Postby virgilmobile » Tue Mar 15, 2016 8:07 am

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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