please help to bleed front brakes
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Enthusiast
2009 MP3 400ie
Joined: 31 May 2016
Posts: 66
Location: philippines
Mon Jun 10, 2019 9:25 pm quote
need help to bleed front brakes after replacement of front knuckle bearings
Hooked
Piaggio MP3 250, BigBeo
Joined: 30 May 2015
Posts: 134
Location: Chelyabinsk, Russia
Tue Jun 11, 2019 12:55 am quote
The main secret is to bleed calipers not installed on the rotors. Because they should be installed with an angle which prevents air removal.

The picture below shows caliper from the inside. The yellow "thing" shows brake fluid. The hole on the upper part leads to bleeding screw.

Left part shows the caliper when it is installed. The air bubble trapped inside can't leave the caliper because bleeder is lower than the air.

Right part shows how it should be bleeded to remove air. Turn it to make bleeder vertical.

ZaPhUGAB-oM[1].jpg

Enthusiast
2009 MP3 400ie
Joined: 31 May 2016
Posts: 66
Location: philippines
Tue Jun 11, 2019 1:43 am quote
Jah wrote:
The main secret is to bleed calipers not installed on the rotors. Because they should be installed with an angle which prevents air removal.

The picture below shows caliper from the inside. The yellow "thing" shows brake fluid. The hole on the upper part leads to bleeding screw.

Left part shows the caliper when it is installed. The air bubble trapped inside can't leave the caliper because bleeder is lower than the air.

Right part shows how it should be bleeded to remove air. Turn it to make bleeder vertical.
Thank you sir will try that
Hooked
Piaggio MP3 250, BigBeo
Joined: 30 May 2015
Posts: 134
Location: Chelyabinsk, Russia
Tue Jun 11, 2019 2:04 am quote
Please, not "sir", but "friend"! And always welcome.
Veni, Vidi, Posti
2008 MP3 500, 2013 BV350
Joined: 13 Oct 2012
Posts: 6814
Location: Ashburn, Va. Home to the Internet
Tue Jun 11, 2019 2:20 am quote
OR, lift the tail end of the bike up to the proper angle.

Thanks for that pic, really helps. I still don't have all the damn air out of mine.
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