Rear Brake Brutale 800 - MVAgusta.net
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post #1 of 11 (permalink) Old 10-14-2017, 09:41 AM Thread Starter
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Rear Brake Brutale 800

Hi guys I have seen lots of different posts about the rear brake on different models so not sure of similarities but I am having an isssue where I have no rear brake reservoir full . I have bled the system got some bubble out at the ABS unit then nice and clear at caliper make sure the res is topped up and after a few miles the pedal goes spongy and works if pumped then a few miles later nothing no resistance at all .
Any suggestions I have been bleeding it by doing all the take caliper off hold at this angle business just doesnt seem happy .
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post #2 of 11 (permalink) Old 10-14-2017, 10:12 AM
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Check the side runout on the rear disc. A warped rotor could be pushing the brake pads so far apart that it needs a few pumps to move the pads against the rotor
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post #3 of 11 (permalink) Old 10-15-2017, 01:28 AM
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Dealer once told me you had to take it off and turn it upside down and then bleed.

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post #4 of 11 (permalink) Old 10-15-2017, 07:41 AM
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@Jont252: The problem is that you are not getting all of the air out of the system. There is a technical bulletin that describes the process, but tenacity is your friend when bleeding the rear brake system. It takes very little air to cause a spongy feel. Removing the rear caliper and tipping so the bleed nipple is up allows air to rise to the nipple for easier release.

Another method, which I use, is to employ an air driven vacuum bleeder. It creates a vacuum that moves volumes of fluid in a way that rids the system of air.

Here is the Tech Bulletin: http://www.mvagusta.net/forum/attach...0&d=1498806106

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post #5 of 11 (permalink) Old 10-15-2017, 10:30 AM Thread Starter
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Thanks for all of the info guys looks like a job for when I have more time to have a good look at it the Technical Bulletin is really useful thanks for this @silentservice703
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post #6 of 11 (permalink) Old 10-21-2017, 09:11 AM Thread Starter
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OK guys still looking for some help here is an update.
Borrowed a Mityvac off a friend at work and got a ton of air out the system got it to a nice clear air free run of fluid closed belled nipple topped up res and tried the brake couple of pumps nice firm feeling I was like yep all done. Released the brake pedal tried again and it was all spongy pumped a bit got some feedback released pedal and it's all gone. I now suspect I am pulling air into the system when I release the brake question is where could it be coming from.
So open to suggestions here guys my thoughts are bleed nipple in calliper isn't sealing, the connections to the ABS are letting air in or the master cylinder has an issue.
Just to note there are no visible leaks.
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post #7 of 11 (permalink) Old 10-21-2017, 09:25 AM
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Did you bleed at the ABS pump per the Tech Bulletin?

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post #8 of 11 (permalink) Old 10-21-2017, 10:19 AM Thread Starter
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Yep got some air out at the R disconnect none at the MC2 one though haven't looked since I tried the brake I honestly think there is an air leak somewhere that I just can't see
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post #9 of 11 (permalink) Old 10-21-2017, 03:53 PM
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Following, with interest! Mine went from being very responsive after servicing by MV dealer to spongy nada in about 4-500km.. and I donít use it much!


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post #10 of 11 (permalink) Old 10-27-2017, 06:58 AM Thread Starter
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OK I think I have found one thing causing me an issue with the rear brake . I have a lower fairing fitted and looking at the tube feed from the reservoir it's got a little squashed so I have re-routed it and am now wondering if its worth getting a new one to fit .
Any suggestions on what to use for replacement or just general brake hose will do it ??
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