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"K13GT" Technical Q&A K1300GT- Technical Questions/Answers

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  #1  
Old 02-05-2018, 05:48 PM
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ABS Brake Bleed...Help needed

Looking through the factory maintenance DVD, I was surprised that the brake bleed procedure covers only a standard bleed of the front and rear calipers with no mention of the ABS unit. I have a GS911 device but have not used the ABS bleed function. A search reveals no information specific to the later model K bike that includes the ABS bleeding procedure, although there are YouTube videos showing the procedure on later model RGS models. Maybe the procedure is the same for the K bikes. Before I tackle the job, I thought some members might have experience on the K1300GT they would be willing to share.
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  #2  
Old 02-05-2018, 06:15 PM
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Re: ABS Brake Bleed...Help needed

Bleeding or flushing?
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  #3  
Old 02-05-2018, 06:19 PM
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Re: ABS Brake Bleed...Help needed

Sorry...flushing as called for in the maintenance guide every two years
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Old 02-05-2018, 07:28 PM
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Re: ABS Brake Bleed...Help needed

Quote:
Originally Posted by dlong0609
Looking through the factory maintenance DVD, I was surprised that the brake bleed procedure covers only a standard bleed of the front and rear calipers with no mention of the ABS unit. I have a GS911 device but have not used the ABS bleed function. A search reveals no information specific to the later model K bike that includes the ABS bleeding procedure, although there are YouTube videos showing the procedure on later model RGS models. Maybe the procedure is the same for the K bikes. Before I tackle the job, I thought some members might have experience on the K1300GT they would be willing to share.

Its pretty straight forward and the GS911 web app on the iphone tells you the order of what you need to do, I can't remember for sure but I think the order is bleed all calipers run the test tool which activates the ABS pump and then bleed again. You can do it as many times as you want all it is doing is moving the fluid from the ABD pump out into the lines so you can flush it. Its a 20min job if you have a pneumatic bleeder which I highly recommend.
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Old 02-06-2018, 01:18 AM
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Re: ABS Brake Bleed...Help needed

That is pretty much it. The GS911 just activates the ABS and you bleed again to see if there was air trapped in the ABS unit. Never seen it in many bleeds. But if you suck air in very possible. My only addition is to clean your puck sides with isopropyl alcohol and swabs. I use a CRC isopropyl spray, and a soft air gun to carefully dry things. Don't want to drive any alcohol past the piston seals.
https://www.amazon.com/Swan-Percent-...pyl+alcohol+90
let dry really well, then push back the pads all the way. Then bleed. You either need a pad expander or some wedges. You will see why, the fill line fitting is part of the bleed nipple and all you do is circulate fluid in and out, not into the caliper body. Object is to expel the fluid in the body and flush it out.
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Old 02-06-2018, 12:45 PM
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Re: ABS Brake Bleed...Help needed

It seems that it would be necessary to activate the ABS pumps with the fluid reservoirs uncapped and not entirely filled to allow fluid to be moved through the system and into the reservoir. If the system is closed, there would be no flow out of the ABS module even when the system is pressurized by the pump and activation of the brake levers. Some YT videos show the procedure done with the reservoir caps in place. Is my understanding correct?
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Old 02-06-2018, 07:57 PM
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Re: ABS Brake Bleed...Help needed

Quote:
Originally Posted by dlong0609
It seems that it would be necessary to activate the ABS pumps with the fluid reservoirs uncapped and not entirely filled to allow fluid to be moved through the system and into the reservoir. If the system is closed, there would be no flow out of the ABS module even when the system is pressurized by the pump and activation of the brake levers. Some YT videos show the procedure done with the reservoir caps in place. Is my understanding correct?

I have never heard this before and it would seem to me if you activated the ABS pump with its reservoirs open that would increase the chances of introducing air into the system. The purpose of the ABS activation is to move any old fluid / air from the ABS pump where it can be bleed out of the calipers.
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  #8  
Old 02-06-2018, 10:27 PM
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Re: ABS Brake Bleed...Help needed

As long as there is fluid in the reservoir, air should not get into the system. If I had a better understanding of how the ABS module is plumbed into the system, maybe I wouldn't be so confused.

I have seen the procedure performed in YT videos with both open and closed reservoirs. The GS911 on screen instructions don't appear to address my question. To those who use the GS911 for brake flushing: caps on or off?

Thanks to Beech for the good advice to take the opportunity to clean the pucks, and to all who have taken the time to respond.
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  #9  
Old 02-07-2018, 01:25 AM
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Re: ABS Brake Bleed...Help needed

When I do the ABS activation via GS911 I generally have the caps off so I can monitor the fluid level. I have also done with on but makes no sense because after you do the ABS activation you need to bleed again. That is what makes the job that much longer. All said and done, takes me about an hour on a non servo brake bike (the 20-06 bikes) take 2 or 3 hours including all the removal needed to get to the ABS unit.
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  #10  
Old 02-08-2018, 04:52 PM
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Re: ABS Brake Bleed...Help needed

Thanks Beech. I will follow your method.
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Old 02-14-2018, 05:39 AM
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Re: ABS Brake Bleed...Help needed

On my 1300GT I also had to bleed using the small nippel next to the reservoir on handlebar. Used to do this at the final stage. Bleeding the smaller nipple is a pain to bleed (due to smaller size) but not bleeding it gave a mushy feel in the brakelever.
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Old 02-16-2018, 01:11 AM
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Re: ABS Brake Bleed...Help needed

Quote:
Originally Posted by knutk
On my 1300GT I also had to bleed using the small nippel next to the reservoir on handlebar. Used to do this at the final stage. Bleeding the smaller nipple is a pain to bleed (due to smaller size) but not bleeding it gave a mushy feel in the brakelever.

You are supposed to bleed it last. You only need to bleed a very small amount of fluid out of this nipple.... just enough to flush out a small bubble of air that can get lodged between the nipple and the brake master (which is what causes the mushy feel you are noticing).
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