15 mm Brembo master cylinder - rebuild question

Post your 'Wheel, Brake & Tyre' FAQs, comments & questions regarding Ducati motorcycles here.
Post Reply
Peter Tourin
Cucciolo - the Lil Pup
Posts: 16
Joined: Sun Nov 13, 2005 6:05 pm
Location: Jericho Center, VT USA

15 mm Brembo master cylinder - rebuild question

Post by Peter Tourin » Wed Mar 01, 2006 8:10 pm

I've got an assembly question about the 15 mm front brake master cylinder rebuild kit. On the piston end nearest the lever, there's a washer and a rubber ring surrounded by a metal ring. They're supposed to stay down in the bore, but as the piston moves, they ride out towards the brake lever and finally come off the end of the piston. What's the trick to make them stay in place? It doesn't seem to be a press fit - when I press the metal ring into place it comes loose and rides up.

Thanks - Peter Tourin
'73 Volvo 1800ES
'74 750GT

User avatar
BevHevSteve
SITE OWNER
SITE OWNER
Posts: 2175
Joined: Wed Mar 10, 2004 8:53 pm
Location: Lafayette, California
Contact:

special tool

Post by BevHevSteve » Wed Mar 01, 2006 9:45 pm

http://www.shop.bevelheaven.com/detail.aspx?ID=42

Peter - it IS a press fit - and easily done with the tool I made and stock [click the link above]
Image
Steve Allen (925)798-BEVL[2385] Ride'm, Don't Hide'm
Ducati/Euro Spares -> https://Store.BevelHeaven.com
Facebook > http://facebook.com/Bevel.Heaven
Twitter > http://www.Twitter.com/BevelHeaven

Peter Tourin
Cucciolo - the Lil Pup
Posts: 16
Joined: Sun Nov 13, 2005 6:05 pm
Location: Jericho Center, VT USA

Post by Peter Tourin » Thu Mar 02, 2006 4:55 am

If it's a press fit, does the washer that comes with the kit go under the rubber and metal rings, as in the parts manual? When I disassembled, I didn't have one, so I want to make sure before I reassemble.

Thanks - Peter
'73 Volvo 1800ES
'74 750GT

User avatar
BevHevSteve
SITE OWNER
SITE OWNER
Posts: 2175
Joined: Wed Mar 10, 2004 8:53 pm
Location: Lafayette, California
Contact:

master cylinder

Post by BevHevSteve » Thu Mar 02, 2006 7:46 am

From the banjo bolt to the lever you go:

*plastic plug
*spring
*piston
*flat washer
*rubber seal with flat part up against washer
*crush washer thing [widest part towards seal]

If you look down inside the master cylinder, youi will notice you see an open bore where nothing touches, then a slightly smaller bore that the 'crush' washer fits into that is only maybe 1 cm deep, then the bore of the master cylinder that the piston rides in.

The crush washer actually presses OUT not in to secure the piston. Using my special tool pushes the crush washer in the direction it needs to go, but doesn;t allow the rubber to get torn etc. Pay attention to how deep the bore is where the crush washer sits, to get an idea of how deep everything must be.
Image
Steve Allen (925)798-BEVL[2385] Ride'm, Don't Hide'm
Ducati/Euro Spares -> https://Store.BevelHeaven.com
Facebook > http://facebook.com/Bevel.Heaven
Twitter > http://www.Twitter.com/BevelHeaven

Post Reply

Return to “Wheel, Brake & Tyre Shop”