FJR1300 ABS Test Harness - Page 3 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #21 of 48 (permalink) Old 02-13-2019, 05:14 PM
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Got one. Thanks Ray.
This makes me wonder if all ABS systems function similarly and lock away brake fluid inside their valves. I was about to flush my trucks system and now im wondering !
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post #22 of 48 (permalink) Old 02-13-2019, 05:23 PM Thread Starter
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It depends on your vehicle's system. Some cars automatically cycle at ignition on, some don't. FJR does not.

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post #23 of 48 (permalink) Old 02-13-2019, 09:27 PM
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You are talking about a self check at ignition on, I think. I wonder if flushing the brakes with ignition on then will get the fluid changed in the ABS system, in these vehicles that do that check? Probably a question for individual manufacturers.
My old BMW RT1100 did a self check before I got to 2nd gear that was a little disconcerting. Im sure a lot of you experienced that. The first time freaked me out !
My Fjr doesn't do that, but surely runs a system check of some kind ?
In either case, is it actually moving fluid though ?

Kiwi
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post #24 of 48 (permalink) Old 02-13-2019, 10:21 PM Thread Starter
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The FJR does an electronics self check only, i.e., you see the ABS light on at start up, but it does not cycle the pump, thus does not purge any fluid.

Ray
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post #25 of 48 (permalink) Old 02-14-2019, 06:35 AM
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Quote:
Originally Posted by Kiwiaudio View Post
Got one. Thanks Ray.
This makes me wonder if all ABS systems function similarly and lock away brake fluid inside their valves. I was about to flush my trucks system and now im wondering !
I've wondered the same thing about my truck but surely Findley, OH gets enough ice and snow that you can exercise your ABS a couple of times every year. That's all we do on the FJR and it seems to work fine.

Russ
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post #26 of 48 (permalink) Old 02-14-2019, 08:21 AM
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I've wondered the same thing about my truck but surely Findley, OH gets enough ice and snow that you can exercise your ABS a couple of times every year. That's all we do on the FJR and it seems to work fine.
You are right about that Russ. Im making my trucks ABS work quite often, just today in fact. My interest was more about changing the brake fluid and if in doing so, would the fluid in the abs system get changed too. But im going to ask in a RAM forum which is where i should have gone with this. Sorry OP

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post #27 of 48 (permalink) Old 02-14-2019, 11:05 AM
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Can I cycle the abs system after fluid change by locking up the brakes in a parking lot on preferably on a rainy/wet surface?

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post #28 of 48 (permalink) Old 02-14-2019, 11:24 AM
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Can I cycle the abs system after fluid change by locking up the brakes in a parking lot on preferably on a rainy/wet surface?
Read the manuals, somewhere in one of them is a description of how the system works including a speed threshold. If you "lock up" the brakes you aren't going fast enough for the ABS to function. Which is exactly why many of us use the ABS test connection- no movement of the bike is required to cycle the ABS, no risk of dropping. What I do (probably overkill but I don't care) in the comfort of my carport once per year:

Cycle ABS via test connection and Test Method #2 per the FSM. Replace all brake and clutch fluids. Cycle ABS again. Replace brake fluids again.

Why so much? I ride in wet weather a lot. As in at least twice per week commuting and every other weekend. When not riding in the wet, I am often exploring dusty dirt road destinations. It often feels like I abuse the brakes on this bike more than any other street bike I've ever owned so I've moved to the "somewhat overkill" on some maintenance items. Plus I want to use up the qt of new fluid I bought.
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post #29 of 48 (permalink) Old 02-14-2019, 11:38 AM
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I have been locking the brakes on my 2013 since I got it. I live off a short gravel road with a steep down hill section. When returning home I will alternate between locking the front and the rear. Yes, it is very important to be over the threshold speed to activate the ABS. On my bike I can feel the front starting to slide to the left just as the ABS kicks in. Without ABS using the front brake on the FJR while in gravel would require great care. I got the test harness from Ray a month or so ago and may no longer use my gravel technique.

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post #30 of 48 (permalink) Old 02-14-2019, 07:48 PM Thread Starter
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I had issues on my '07 with the speed threshold and gave up. Sure you can do it that way, but I'm no longer a fan of trying to skid the wheels. Now I just pop the battery cover off and it's right there while I have all the fluid stuff out, don't have to go out and come back. On '07 and earlier, due to the ABS design then, you really want to activate per Russ's two time method to ensure the ABS fluid circuits are purged. '08 and later likely once is enough. If you do it annually, you should have no worries whatsoever.... preventative maintenance.
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