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Old 07-27-2016, 07:40 AM   #1
Dmansrod
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Failed ABS HCU

So long story short my rear brake pedal was really stiff ( like pushing against a wall). I took the bike to the stealership and they said the ABS hydraulic control unit was the problem. Is this a common failure? The front brakes still work perfectly.
A new one is $350 plus install cost. I'm confident I can install it myself but are there any parts of the install that has to be done by HD.

Does anyone have one they can sell?
Can just the rear portion of this be bypassed?
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Old 07-27-2016, 10:11 AM   #2
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Quote:
Originally Posted by Dmansrod View Post
So long story short my rear brake pedal was really stiff ( like pushing against a wall). I took the bike to the stealership and they said the ABS hydraulic control unit was the problem. Is this a common failure? The front brakes still work perfectly.
A new one is $350 plus install cost. I'm confident I can install it myself but are there any parts of the install that has to be done by HD.

Does anyone have one they can sell?
Can just the rear portion of this be bypassed?
How about reminding the dealer there's a law suit happening right now about those ABS units. Make a call to the NHTSA and add fuel to the fire. Last damn thing I'd do is buy another defective POS that will eventually fail also. If should be free. Don't buy into that bs about not changing fluids every two years either. The module is built without a bypass. Normally if the module fails , braking should revert to normal braking, not have one or other fail.
Ron
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Old 07-27-2016, 03:25 PM   #3
Dmansrod
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Thanks for the info, I contacted the NHTSA and was advised to fill out a complaint which I did. I didn't realize the HCU failure was involved in ongoing litigation with HD.
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Old 07-27-2016, 04:44 PM   #4
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It's a common failure.I have seen it frequently,normaly on the front brake.You can bypassed the rear brake linking the two rear brake hoses with a brake line junction,
otherwise the rear brake will remain stiff.If you have skills and tools you can change the hydraulic unit by yourself,the only boring thing is the bleeding proccess,it will take you some time.
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Old 07-27-2016, 05:03 PM   #5
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so when will this abs brake failure turn into a landslide of claims ?so happy i chose not to have this time bomb on my bikes .
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Old 07-27-2016, 05:31 PM   #6
Dmansrod
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If I bypass it using a junction block will it operate like a normal brake without ABS? Or will it still be very difficult to push?
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Old 07-27-2016, 06:55 PM   #7
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It will works like a conventional brake system.The brake pedal will be normal (no stiff anymore) but if you push it hard the wheel will lock (normal brake no Abs)
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Old 07-27-2016, 07:07 PM   #8
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Awesome, thank you for the advice. That's definitely what I'm going to do.
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Old 07-28-2016, 09:58 AM   #9
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Originally Posted by Dmansrod View Post
Thanks for the info, I contacted the NHTSA and was advised to fill out a complaint which I did. I didn't realize the HCU failure was involved in ongoing litigation with HD.
Cool and thanks. I hate these damn corps trying to weasel out of safety obligations. The more reports that show up the more chance to get it resolved, on their dime, not ours. Hope there's no real serious accidents in the mean time.
Ron
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Old 06-13-2017, 04:58 PM   #10
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were you able to figure out how to bypass? or was there some other solution?
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Old 06-14-2017, 01:42 AM   #11
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My '09 has the ABS unit but the whole thing has been bypassed. The front and rear brake lines have been replaced with one from a non-ABS bike.
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Old 06-14-2017, 07:14 AM   #12
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Quote:
Originally Posted by dagenius01 View Post
were you able to figure out how to bypass? or was there some other solution?
If you want to by pass the module without change the lines ,you just need a brake fitting and follow the drawing.
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Old 06-14-2017, 01:18 PM   #13
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abs

Quote:
Originally Posted by Dmansrod View Post
So long story short my rear brake pedal was really stiff ( like pushing against a wall). I took the bike to the stealership and they said the ABS hydraulic control unit was the problem. Is this a common failure? The front brakes still work perfectly.
A new one is $350 plus install cost. I'm confident I can install it myself but are there any parts of the install that has to be done by HD.

Does anyone have one they can sell?
Can just the rear portion of this be bypassed?
I believe its pretty hard to bleed it yourself(ABS)if not impossible. You have to take it to Harley so they can use that digital tech tool. I received a letter concerning my brake system yesterday. It was stating that I had never been in to have fluid changed and it went on to explain what happens to dot 4. Well I do change my fluid. I guess it must be due to the problems Ron was speaking of.
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Old 06-14-2017, 01:54 PM   #14
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You can bleed the ABS system in the traditional way with no problem,it just take you some more time to finish.The Digital Tech just make things faster.
When you bypass the ABS module the brake will works in a conventional way and the bleeding proccess will be faster.
I usually bleed the brakes, take a ride on the bike to warm up the system, and then I bleed them again to avoid any air bubbles remaining.
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Old 02-25-2018, 08:14 PM   #15
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ABS Failure = Brake Failure

I thought I would jump in on this conversation.

My ABS went out and like the rear brake issue, I had the front brake fail. The handle would not pull in and I was left with only the rear brakes. I do a lot of engine braking, so was not that serious. Could have been worse.

I replaced all of the brake lines with custom lines. I am tired of HD prices and wait times. I used Venhill and was very happy with the lines. I am currently in the process of removing all of the wiring involving the ABS since the failure caused a failure in the ABS Diodes as well. This means no brake lights. Hopefully this will reduce future problems.

Overall, it would have been easier to get a double banjo bolt and bypass the ABS module with two lines, but I wanted to make the bike more serviceable for the future if I had problems.

If you change lines out, the rear brakes use a pressure sensor for the brake lights. I bought an aftermarket banjo bolt sensor to alleviate more line connections and everything lined up great.
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