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Rear brake problem - RD400F

Started by SoCal250, October 05, 2020, 11:55:03 PM

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Hardy

#30
October 25, 2020, 02:41:10 AM
Thinking simple still, perhaps your new line has been over crimped? Only way to test would be to remove and push air through it...

Hardy

SoCal250

#31
October 25, 2020, 10:30:37 PM
Quote from: Hardy on October 25, 2020, 02:41:10 AM
Thinking simple still, perhaps your new line has been over crimped? Only way to test would be to remove and push air through it...

The brake hose is not new. It's the same braided SS one that has been on the bike since I have owned it, and the brake was working fine with this hose prior to rebuilding.
75 Yamaha RD125B   75 Yamaha RD125B (project)
75 Yamaha RD250B   75 Yamaha RD200B (project)
73 Yamaha RD350     77 Yamaha RD400D   79 Yamaha RD400F  
91 Yamaha TZR250R  89 Yamaha FZR400   05 Yamaha FZ6   
05 Yamaha XT225TC  82 Honda MB5  02 Aprilia RS250 Cup (sold)

forexer

#32
October 26, 2020, 01:52:35 AM
since you're not sure what the problem is I would do exactly what you did and troubleshoot one component at a time.

after re- reading - the only thing that hasn't been checked is the brake line itself and although you say it's good I would definitely check it and verify that it is in fact good so you can rule it out or if it's found bad change it.

Good Luck!
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