How many cycles to flush ABS HCU?
#1
How many cycles to flush ABS HCU?
I just replaced the brake fluid on my 15 Limited. I know the dealer uses the Digitial Tech thingy or whatever it's called to flush out the HCU. Since I am doing this myself, I am asking how many times should I activate the ABS to get the new fluid in and old fluid out of the HCU? I am planning on changing the brake fluid again after the HCU is flushed out. I sleep a lot better when I can avoid going to the dealer for anything.
#2
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smitty901 (08-13-2017)
#3
#4
The only way to be sure it's done right is to educate yourself and do it yourself. I am not overly impressed with the quality of work done by most auto/motorcycle "professionals" these days. The OP is on the right track IMO.
#5
I just replaced the brake fluid on my 15 Limited. I know the dealer uses the Digitial Tech thingy or whatever it's called to flush out the HCU. Since I am doing this myself, I am asking how many times should I activate the ABS to get the new fluid in and old fluid out of the HCU? I am planning on changing the brake fluid again after the HCU is flushed out. I sleep a lot better when I can avoid going to the dealer for anything.
#6
Join Date: Jun 2007
Location: People's Republic of Boulder Colorado
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Ya got that right!
No confidence at all in dealership "techs", especially where the MOCO's concerned!
I believe that there's a hand-held gadget available online that's the same as the one the dealerships use.
Last edited by jpooch00; 08-09-2017 at 07:05 AM.
#7
I just replaced the brake fluid on my 15 Limited. I know the dealer uses the Digitial Tech thingy or whatever it's called to flush out the HCU. Since I am doing this myself, I am asking how many times should I activate the ABS to get the new fluid in and old fluid out of the HCU? I am planning on changing the brake fluid again after the HCU is flushed out. I sleep a lot better when I can avoid going to the dealer for anything.
I just saw this and am wondering if it would work to cycle the module or if its just a code reader which to me would be useless and expensive.
Would be nice if someone would make a knock off tool, I too don't trust dealer bike washers to work on my bike ( or wash it either )
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#8
#9
If you insist on doing this.....................
Attack the problem from the other end. Once your old fluid is flushed and changed, refill the master cylinder and bleed as much as you can the old fashioned way from the right hand caliper side.
Then, use a 2Ml syringe or larger, fill the syringe with brake fluid. Insert the end of the syringe into the bleeder nipple and slightly loosen the bleeder valve.
Now squeeze the brake fluid from the syringe into the bleeder valve while someone up top watches the air bubbles come up to the master cylinder. Repeat this cycle until no more air is rising up through the master cylinder. You may have to suction excess brake fluid out of the MC depending on how many cycles it takes to get all the air out.
Of course there are two simpler methods;
1. Take it to the dealer after you've done the initial flush, refill and bleed and let them hook it up to the DT and properly cycle and bleed the ABS module.
2. While you're changing your brake fluid make sure that you never let the master cylinder brake fluid level drain down to the point that the system is sucking air.
Attack the problem from the other end. Once your old fluid is flushed and changed, refill the master cylinder and bleed as much as you can the old fashioned way from the right hand caliper side.
Then, use a 2Ml syringe or larger, fill the syringe with brake fluid. Insert the end of the syringe into the bleeder nipple and slightly loosen the bleeder valve.
Now squeeze the brake fluid from the syringe into the bleeder valve while someone up top watches the air bubbles come up to the master cylinder. Repeat this cycle until no more air is rising up through the master cylinder. You may have to suction excess brake fluid out of the MC depending on how many cycles it takes to get all the air out.
Of course there are two simpler methods;
1. Take it to the dealer after you've done the initial flush, refill and bleed and let them hook it up to the DT and properly cycle and bleed the ABS module.
2. While you're changing your brake fluid make sure that you never let the master cylinder brake fluid level drain down to the point that the system is sucking air.
#10
Ok. This may sound stupid. But wondering if it would work. Put bike on jack. Flush system like normal. Now take about 30 feet of string place it taped onto center of rear tire rolling tire and wind up backwards taping every so often to keep it centered to make it like a pull (recoil start like) from bottom of tire. Turn ignition on. Get someone to press front brake as you open bleeder. Get a kid to run straight back pulling the string and spinning the rear tire. The system recognizes the rear tire spinning and front not spinning then abs kicks in pumping. Wondering if this would work.
Last edited by K Melancon; 08-10-2017 at 03:54 PM.
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OldMike (08-11-2017)