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Old Feb 2nd 2018, 02:54 AM   #1
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I Ride: Panigale V4S, 749R, Aprilia RSV4, Husky FC-450
V4 Brake Failure!

Attention all V4 owners!!!

I think there is a brake fault on the V4's.
I suffered brake failure on mine today coming back from a ride, under light to medium braking from 120kph ish for no reason the brakes let off for about half a second then reapplied, then let off again then reapplied, during all this there was no change to the actual brake leaver just a constant pressure from me.

It very nearly caused me to come off the bike....

The issue feels like an electronic ABS fault because the road surface was clean, the tyres were warm and I was able to replicate the problem about 30% of the time on differant roads to make sure it wasn't me.

I dont know if this is related but the brake fluid resivour has also leaked fluid all over the screen and instrument panel, eating into the plastic(see pictures below).

The white spots on the screen are where it has eaten into the plastic, and it has done the same to the instrument panel.

Ohh and the quick shifter has now stopped working as well.

I really should have stayed in bed this morning. I don't know if mine is an isolated problem or if it will effect more bikes over time. I have had mine since Jan 2nd and have just gone over 2800km.

Please guys be super careful I don't want anyone to have an accident or get hurt.

Feel free to DM me if you have any advice or queries


I will update with photos as soon as I get on to my laptop this evening.
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Last edited by Bradoshi; Feb 2nd 2018 at 02:56 AM.
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Old Feb 2nd 2018, 03:31 AM   #2
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Originally Posted by Bradoshi View Post
Attention all V4 owners!!!

I think there is a brake fault on the V4's.
I suffered brake failure on mine today coming back from a ride, under light to medium braking from 120kph ish for no reason the brakes let off for about half a second then reapplied, then let off again then reapplied, during all this there was no change to the actual brake leaver just a constant pressure from me.

It very nearly caused me to come off the bike....

The issue feels like an electronic ABS fault because the road surface was clean, the tyres were warm and I was able to replicate the problem about 30% of the time on differant roads to make sure it wasn't me.

I dont know if this is related but the brake fluid resivour has also leaked fluid all over the screen and instrument panel, eating into the plastic(see pictures below).

The white spots on the screen are where it has eaten into the plastic, and it has done the same to the instrument panel.

Ohh and the quick shifter has now stopped working as well.

I really should have stayed in bed this morning. I don't know if mine is an isolated problem or if it will effect more bikes over time. I have had mine since Jan 2nd and have just gone over 2800km.

Please guys be super careful I don't want anyone to have an accident or get hurt.

Feel free to DM me if you have any advice or queries


I will update with photos as soon as I get on to my laptop this evening.
Oh wow please keep us posted and if you experience this again. And you're sure it wasn't normal ABS sensation of "grab and release, grab and release" rapidly ?
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Old Feb 2nd 2018, 04:49 AM   #3
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It's like ABS but very slow. While holding a constant pressure on the brake lever the bike dips as per normal and the brakes just release, but they release long enough for the front of the bike to ride back up to normal level and then they come back on again causing the bike to dip, and then off again etc etc

It's like super slow motion ABS, and I tried it on a few different roads to make sure it wasn't me or the ABS.
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Old Feb 2nd 2018, 05:18 AM   #4
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this could definitely be related to the leaking fluid. I think It most likely is- I can think of a few scenarios where this is due to a person assembling the bike screwed up and a few where components failed . more than likely it is an assembly or pre-assembly (in Italia) mistake.
I would highly doubt this is a wide spread problem. don't ride it anymore and get it all covered under warranty including the screen make sure you inspect the plastic painted areas for damage due to brake fluid corrosion get it into the dealership asap

Sucks you went through this with your brand new bike

on a positive note its more than likely an easy fix, you've got the hottest bike on the street and you didn't get hurt.
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Old Feb 2nd 2018, 05:45 AM   #5
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Folded disk?
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Old Feb 4th 2018, 03:52 AM   #6
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Bradoshi has posted elsewhere that it was an abs sensor wire came loose
I'll be checking the brackets that hold mine on. That could've ended badly.
Hope you get her fully sorted asap Brad.


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Old Feb 5th 2018, 07:58 AM   #7
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And so it begins....
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Old Feb 5th 2018, 08:08 AM   #8
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Hey guys,

Sorry for the delay uploading these for you....

*UPDATE*

I have just had a call from the dealer. The issue is the front ABS sensor. The sensor wire has come loose from under the front mud guard, dropped down and rubbed through on the tyre causing it to get false readings.

Below are a few pictures of the fluid leak and damage to the screen (I dont have any of the damaged display), and also the ABS sensor wire itself.

I hope this is an isolated incident and that I'm just unlucky, but please get yours checked or look yourself just to be 100% safe


**I cant seem to get the decent quality images to show sorry, I will add as an attachment below**








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Last edited by Bradoshi; Feb 5th 2018 at 08:29 AM.
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Old Feb 5th 2018, 08:15 AM   #9
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Pictures

Photos attached
Attached Images
File Type: jpg 20180202_131552.jpg (29.0 KB, 93 views)
File Type: jpg 20180202_131606.jpg (40.5 KB, 84 views)
File Type: jpg 20180204_132952.jpg (27.3 KB, 82 views)
File Type: jpg 20180204_132956.jpg (30.4 KB, 83 views)
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Old Feb 5th 2018, 07:00 PM   #10
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Glad you're all right and getting it all sorted out, Brad. Thanks for sharing and updating us. I agree with what Macattack said above. You should get your dealer to replace the damaged screen and display, too, if they aren't already. Cheers
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