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Trouble-Shooting: Weird 'hiccup' with front brake

2345 Views 2 Replies 3 Participants Last post by  Rolex
I've experienced a strange braking sensation maybe 3-4 times over the last month. Maybe someone else has run into the same and can provide some insight into what's going on.

Before I describe the symptoms, I will say in advance that the ABS on my 2012 DL650 has been, for the most part, non-functional for the better part of the last 3 riding seasons. My winter maintenance goal this year is to finally resolve that. It perhaps bears mentioning that the ABS has 'fixed itself' temporarily on a few rides over the last few weeks -- I discovered this when my rear ABS suprisingly activated under braking on my morning commute a few times.

Here's what happens with the front brake:

I approach a stop and downshift to slow down before applying brakes. Once at a slow enough speed, I begin to apply both front and rear brakes. The front brake will unexpectedly tighten up maybe 4 or 5 times. I feel this in both the brake lever and the momentum of the bike. This isn't like the even flutter of normal ABS application; it's uneven and intermittent. Every time this has happened, it's only happened during one stop. After that, all works normally (without ABS). When it happens, it's always at a slow enough speed that shouldn't trigger a normal ABS response. Also, it doesn't completely lock up the brake.

To hazard a guess, I'd say that maybe whatever has been plaguing my ABS system is deteriorating further and causing other issues. Maybe resolving the ABS problem will solve this as well. But I'm open to other things to check, since I'll be tearing into the system when the snow starts flying.

FWIW, I try to do a good job on my non-ABS brake maintenance -- the fluid gets replaced every year, the pads (front & back) are good quality and have plenty of material, the disks don't have any obvious mars or glazing and are within spec.

Another item that may or may not be noteworthy: Both the short-lived ABS correction as well as the front brake issue both occurred within the same time period (last month or so), and both seem to occurr during morning commutes when the temps have been in the 30s or 40s. I'm unsure if temperature has anything to do with this.
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I recently experienced something that may be similar. The front ABS would start pumping violently when I used the brakes at walking speeds but would work normally at any speed above walking speed. The ABS diagnostics showed a C35 code. After following the test procedures in the service manual, I found that terminals 3 and 4 at the ABS wire connector were not getting power. The 2 terminals on the ECM that supply power to terminals 3 and 4 showed light surface corrosion. I cleaned the terminals on the ECM and tested the voltage at the ABS module wire terminals. Voltage was at spec. after cleaning and the ABS has worked normally since.
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Do you get the same issue if you don't apply the rear brakes at the same time ?

I'm wondering if you are getting pressure from the rear brake into the front system because of the ABS problem,
feeling the front lever pressure while standing on the rear pedal may give you the answer
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