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A friend of mine has a 1500.I believe it is a 1999 .He called me with a problem with his brakes.He says the front brake lever pulls all the way to the grip.It has been in the garage for a couple of weeks without being used..The last time he used it,the brakes were fine....There is no evidence of fluid leakage.After questioning He believes the fluid has never been changed.I told him to flush both systems with brake fluid.I seem to remember Honda using a fish oil base brake fluid which breaks down in time and leaves a sludge in the reservoirs and system.Does anyone here have any more advise I can relay to him?....I have an 1800 since 03 and my memory is a little fuzzy on the 1500s......Thanks in advance....Jim:?
 

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Pretty much any fluid breaks down with time. I never heard of fish oil brake fluid but there are still a few things to learn. He should use DOT4 fluid and it should be flushed at least every 2 years.
 

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Let us know how your friend gets on with this Jim, the GL1500 can be tricky to bleed if you let the fluid drop too low.
 

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This is only a guess. But I'd have him check the master cylinder. Based on what you describe, my guess is that the master cylinder blew a seal and allows brake fluid to transfer to both sides of the piston thus not being able to pressurize the system.
Even though brake fluid all deteriorates, bad fluid shouldn't do what you describe since no fluid can be compressed.
As I said, just a guess.
 

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Thats usualy what happens as Wingrider44 said above. Seal leak between transfering fluid. Instead of making pressure.
 

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always amazes me that one of the things people think never needing to change is brake fluid. it both breaks down over time, and it is designed to actually absord moisture. this second quality is to prevent water from ending up at the bottom of your brake cylinders which would cause two things, corrosion and worse yet, boiling under hard breaking applications
 
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