Brembo RCS19 Strange feeling on lever - MVAgusta.net
 
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post #1 of 10 (permalink) Old 04-07-2016, 07:51 AM Thread Starter
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Brembo RCS19 Strange feeling on lever

Hi guys, just want to see if you could shine a light on this.

Mods, I've been searching this for a while and didn't came with anything, but feel free to delete if already been discussed.

So, on first lever pull, it looks like it takes a long lever travel to start braking, then it bits hard. If I release the lever and apply pressure right again, it starts braking on the first few mm of lever movement. But after a few seconds it goes back to the longer travel to work.

It does not feels spongy. Also, with bike on stand, I can fell that the brakes are a little bit applied on that few seconds it takes to the lever gets back to original feeling.

Have bleed and re bleed, cleaned calipers, pushed calipers cylinders back, left bike with a tie up on lever for a week and it continues the same.

So I just wondering if there's still air on system or the RCS19 is supposed to be like that.

Bike is a 2010 F4 with original lines, caliper, pads (just a bit more than the 1mm remaining) and discs. I do have a radial master cylinder adaptor installed.

Thank you and really hoping its really air (and that I must be an idiot bleeding that thing). Been riding the bike like that for 6 months.
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post #2 of 10 (permalink) Old 04-07-2016, 08:34 AM
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Sounds like air.

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post #3 of 10 (permalink) Old 04-09-2016, 12:13 PM Thread Starter
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Originally Posted by silentservice703 View Post
Sounds like air.

Thanks!

Well, so vacuum bleeding with be next attempt (sorry Noel).

So just went out and got some stuff for the job. Homemade vacuum bleeder (will let you know how it goes):

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post #4 of 10 (permalink) Old 04-09-2016, 12:33 PM
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Nice work. I use a vacuum bleeder for all of my brake/clutch bleeding.

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post #5 of 10 (permalink) Old 04-09-2016, 04:37 PM Thread Starter
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Originally Posted by silentservice703 View Post
Nice work. I use a vacuum bleeder for all of my brake/clutch bleeding.

Well, it didn't worked out so well. The vacuum is too weak to pull the fluid... Although it feels better to use the regular open-push lever-close-release lever thing.

After some effort it feels more consistent throughout multiple lever pushes, but still looks like the brake releases later than lever release...

Will see if I come with something and get back.

Thanks for the help.
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post #6 of 10 (permalink) Old 04-09-2016, 04:38 PM
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post #7 of 10 (permalink) Old 04-09-2016, 05:16 PM Thread Starter
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post #8 of 10 (permalink) Old 04-09-2016, 07:45 PM
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I'm sure you have already tried this , but you did purge the air out of the master cylinder itself? You can get small air bubble in the unit . Purge at both the brake caliper and the bleeder on master cylinder.
ALSO .. I have pushed fluid up from caliper bleeding caliper first and opening up master cylinder bleeder till fluid/air came out .
post #9 of 10 (permalink) Old 04-09-2016, 10:34 PM Thread Starter
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I'm sure you have already tried this , but you did purge the air out of the master cylinder itself? You can get small air bubble in the unit . Purge at both the brake caliper and the bleeder on master cylinder.

ALSO .. I have pushed fluid up from caliper bleeding caliper first and opening up master cylinder bleeder till fluid/air came out .

Thanks.
Did bleed from the bleeder on MC and from a bleeder I installed on the banjo that fits the radial adaptor. I did tried to push calipers cylinders in and bleed from MC, but it looked to be worse after that. But never tried to push fluid in from caliper.

How did you do that?

Thanks for the help!
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post #10 of 10 (permalink) Old 07-18-2016, 08:52 AM Thread Starter
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Guys, just want to update since I had it solved.

I removed the radial MC adaptor and banjo with bleeder and installed a new adaptor from HEL performance. Also did not used a banjo with bleeder on the adaptor, just a regular banjo.

Well, after just a few bleeding from the MC (pushing lever) it was fine. Finished the bleeding from calipers and again at the MC.

So it was for sure something with the previous adaptor or something.

Feeling is completely fine now, consistent and brake release is immediate.

Thanks everyone for the help.
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