I recently purchased a 2006 FJR1300 for what I thought was a very good price. It has a weak front brake that I thought would be an easy fix. Just rebuild the master cylinder.
I was quite incorrect on my estimation.
For a quick check, I swapped the master cylinder off a 2007 FJR that I have also. The brakes on that bike work well.
That master cylinder swap gve me the same results. I bled the front brakes several times with no improvement, before learning of the ABS test/flush procedure required to do a proper system bleed.
I bled/flushed the system sevaral times using over a quart of fluid. During the test, the front brake pressure increased dramatically pushing the lever all the way out to the stop against my force. After the test cycled through each time, the front brake lever looses all pressure rapidly and pulls right back to the handle bar. Pumping it several times it gains pressure, then as I hold it, it slowly creeps back to the bar.
Reviewing the brake system schematic, I see that there is a check valve between the front brake mastercylinder and the ABS hydraulic pump. I suspect that check valve has failed.
These units are apparently not rebuildable and cost over $1,600 new. I found a used one on ebay, and am hoping that one works.
My ABS test jumper. #12-10 wire gauge female terminal end.
It required some slight reshaping and squeezing, but works perfectly.
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I was quite incorrect on my estimation.
For a quick check, I swapped the master cylinder off a 2007 FJR that I have also. The brakes on that bike work well.
That master cylinder swap gve me the same results. I bled the front brakes several times with no improvement, before learning of the ABS test/flush procedure required to do a proper system bleed.
I bled/flushed the system sevaral times using over a quart of fluid. During the test, the front brake pressure increased dramatically pushing the lever all the way out to the stop against my force. After the test cycled through each time, the front brake lever looses all pressure rapidly and pulls right back to the handle bar. Pumping it several times it gains pressure, then as I hold it, it slowly creeps back to the bar.
Reviewing the brake system schematic, I see that there is a check valve between the front brake mastercylinder and the ABS hydraulic pump. I suspect that check valve has failed.
These units are apparently not rebuildable and cost over $1,600 new. I found a used one on ebay, and am hoping that one works.
My ABS test jumper. #12-10 wire gauge female terminal end.
It required some slight reshaping and squeezing, but works perfectly.
