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Rubber Mount Sportster Motorcycle Talk (2004-2006) This area is to discuss issues, problems and anything else unique to the 2004 and above Sportster motorcycles

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  #1  
Old 14th July 2021
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Question Pressure at Front brake lever

Hi Guys,

I am seeing a buildup of what feels like pressure at the front brake lever. I Recently saw a bluish tinge to the front brake rotor.

A few years ago I upgraded the front Caliper with a Performance Machine part and braided lines as well as a Galfer style floating rotor.

See Photo. I believe I should do a complete brake fluid bleed/exchange? It has been the same fluid since 2005...

Thanks for any opinions and inputs...

Slick (aka Hans).
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File Type: jpg front brake.jpg (39.2 KB, 14 views)
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Old 14th July 2021
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Quote:
Originally Posted by XL_1200C View Post
...I believe I should do a complete brake fluid bleed/exchange? It has been the same fluid since 2005...
That's where I'd start. And spread the pads, pushing the pistons in to make sure they will retract.

That blue you see is heat from the pads dragging on the disc. Not good.
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  #3  
Old 15th July 2021
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make sure brake handle is releasing all the way.if not it wont uncover relief port in master cyl. and with heat will build its own pressure.
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Old 15th July 2021
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Often you build up a contamination ring on the outside of the piston, perhaps extending the piston to check and clean as necessary?
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  #5  
Old 17th July 2021
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Thanks Guys, I'll use this info to check out my bike! Always get good advice here..

Slick
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Old 18th July 2021
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Quote:
It has been the same fluid since 2005...
That's a start. I believe the fluid is supposed to be flushed ever few years, so it's overdue. Get a MityVac kit. It makes a huge difference. On my '05, the specification is DOT5 fluid. Make sure that you have the correct fluid.



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Old 18th July 2021
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https://www.youtube.com/watch?v=fzIjtyLaZNk

https://www.youtube.com/watch?v=PdtHUHi0_-Y
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Old 18th July 2021
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How did you change the lines without changing the fluid? That would be hard I think.
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Old 18th July 2021
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Good grief. The fluid in the braking system should be changed every two years.

For the disc to blue as pointed out has been overheated. It wouldn't be at all a surprise to find the master cylinder , caliper or both are semi seized due to a lack of maintenance.

I think you ought to do a complete refurb on both and possibly a new disc as well.

Because I have a "friend" I can bleed the braking system with a short piece of pipe and a jam jar.
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Old 18th July 2021
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Quote:
Originally Posted by Jcolleyoh View Post
How did you change the lines without changing the fluid? That would be hard I think.

Hi , Yes I simply topped it up after the new lines were installed. That was 10 years ago...so I guess its time to bleed!

Thanks
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