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post #1 of 35 Old 09-28-2018, 08:59 PM Thread Starter
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Need help to cure front brake

Need help to cure front brake.

So this happened two days in a row: I lost front brake on a bumpy steepish downhill. Lever would go down to the bars without braking.. pumping up would help but only somewhat. Brake would get back to "normal" once we got back to road sections, though lever would feel spongy like there's air in the system. The loss would be gradual and could have been counted by constantly pumping lever. First time it happened I ended up running wide into ditch (my fault got distracted by turkey.. but not having front brake didn't help)

No visible leaks, brakes were bled 4 times (last time removing brakes and hanging them high). Probably bled 32oz bottle through.

Have a couple theories:
- air in abs unit which would get released only when abs engaged and it did buzz on occasions
- failing master cylinder
- there's a leak somewhere

If anyone knows a way to bleed abs unit pls let me know!

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post #2 of 35 Old 09-28-2018, 09:07 PM
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Id pull the abs fuse and try that hill again. More testing is in order.

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post #3 of 35 Old 09-28-2018, 10:04 PM
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There was a recent discussion here regarding ABS brakes where the posters agreed that the ABS system does sometimes cause an issue with the front brake.
The cure that they agreed on was that you should find a straight piece of deserted road and repeatedly induce the ABS to operate - until all seems good again.

A similar thread here:
https://www.v-strom.co.uk/smf/index.php?topic=26095.0

Otherwise:
https://www.stromtrooper.com/dl650-d...akes-k9-2.html
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File Type: jpg Brake stroke DL650.JPG (23.0 KB, 15 views)
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post #4 of 35 Old 09-29-2018, 12:57 AM
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I had a car that did the same thing on bumpy roads.
It was caused by air in the ABS which was bled out by a brake specialist.
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post #5 of 35 Old 09-29-2018, 02:53 AM
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Yup, that's the cause a speck of crap in the ABS valve. Be warned it may take some effort to move it, I have a large grassy back yard and picked a rainy day.

Up to 30-40kph, hit the front hard, skid 10m or so, pull up, turn around repeat. It took a lot of passes but it did fix the problem but I was covered in sweat at the end - far end of my yard either way has quite a big drop .

You may get lucky, but plan on twenty or so passes.
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post #6 of 35 Old 09-29-2018, 12:53 PM Thread Starter
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Thanks for replying guys!

I will bleed front brake to see if there's any air there if is it must have come from abs.

I wish there was a way to bleed abs unit itself.. BMW used to put bleeders on servo pump was pain but at least you could do it right.
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post #7 of 35 Old 09-29-2018, 02:08 PM
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Not a biggie activating it on gravel, that's what worked for me. I like the bumpy hill idea. I'm not sure how the factory does it. Maybe there is a remote abs controller to cycle the valves.

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post #8 of 35 Old 09-29-2018, 09:05 PM Thread Starter
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Quote:
Originally Posted by Hatchi View Post
Not a biggie activating it on gravel, that's what worked for me. I like the bumpy hill idea.
You really don't.. ran wide at one of the switchbacks and ended up in the ditch

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post #9 of 35 Old 09-29-2018, 09:25 PM
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Ha, okay a straight bumpy hill with no traffic.

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post #10 of 35 Old 09-29-2018, 10:03 PM Thread Starter
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Quote:
Originally Posted by Hatchi View Post
Ha, okay a straight bumpy hill with no traffic.

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There was a turkey and a deer not much traffic otherwise
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