Rear brakes issue 15’ Monster 821

[Monster722]

Hi guys!

There’s another issue with my monster(( For some reason rear brakes not working. I went to service and had it bleed few times, but after 1 week all the same. The brakes gradually disappears.
I’ve already changed master cylinder (62540201A). Nothing changed though.

To make it clear the caliper was positioned upwards during bleed and brakes were working fine right after the service.

I’ve been in 4 different services nobody knows the reason. Even official Ducati dealers says they have no idea what is the cause of problem. Everyone says it’s normal for Ducati. I would agree with it and don’t care much if they work for at least a couple of months. But brakes disappeared 1 week after bleeding.

PS
I’ve duplicate this post to another Ducati forums as well


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[Howie]

Somewhat common, yes.  Normal?  No.

You can have a leak small enough to allow air in, but not leak fluid.  I suspect your problem is the caliper.  Unfortunately I Don't know a way to positively diagnose that other than replace.

[Monster722]

Somewhat common, yes.  Normal?  No.

You can have a leak small enough to allow air in, but not leak fluid.  I suspect your problem is the caliper.  Unfortunately I Don't know a way to positively diagnose that other than replace.

I’ve read somewhere that downwards facing caliper may be the issue. Will wait for some more replies, if no other solution suggested then probably will change caliper((

Really a shame that Ducati don’t give any solution, though official dealers send them a lot of messages concerning this issue.


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[koko64]

Brake line routed close to exhaust somewhere?

[d3vi@nt]

Common issue with the Mutli's from 2010 and up. Service bulletin was updated to instruct not only invert the caliper so the bleed nipple is upward, but also free the brake line so you can then lift the caliper as high as possible and secure to the frame to ensure it's the high point, then bleed as normal.

Others have gone a step further to recommend then activating the ABS 10 times, then bleeding again using the same procedure as above.

Good luck!

[Monster722]

Common issue with the Mutli's from 2010 and up. Service bulletin was updated to instruct not only invert the caliper so the bleed nipple is upward, but also free the brake line so you can then lift the caliper as high as possible and secure to the frame to ensure it's the high point, then bleed as normal.

Others have gone a step further to recommend then activating the ABS 10 times, then bleeding again using the same procedure as above.

Good luck!

Few times In service they lifted it up like you say. It took about an hour to make it work. But it last for a few weeks.

What exactly meant by activating ABS? Should I take a ride around service and break hard to activate ABS?


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[ducpainter]

Please remove the Tapatalk signature from your phone... http://www.ducatimonsterforum.org/index.php?topic=73379.msg1351052#msg1351052

[Howie]

If air is trapped in the ABS pump it is difficult, though not impossible to bleed without activating the valves.  The reason I am guessing caliper is after bleeding you have a good pedal.

[Stuka Pilot]

Known problem for 821/1200 M models.

Ducati have released an updated rear brake line which 'fixes' this.

They swapped the rear brake line on my 1200R under warranty, although technically the warranty had expired. Since replacing the line, the rear brake has stayed good.

[Monster722]

Known problem for 821/1200 M models.

Ducati have released an updated rear brake line which 'fixes' this.

They swapped the rear brake line on my 1200R under warranty, although technically the warranty had expired. Since replacing the line, the rear brake has stayed good.

Do you have updated lines OEM number?