[Ducati] 748 rear brake issues

[Rich Roberts]

Brake fluid is hygroscopic, meaning likes moisture, also seals, no seal ia absolutley perfect, so piston moving back and forth even that little bit, over time moisture in and air. In fact get moisture hot at piston to pad and you have steam....may be slight but it acumulates over time, why it is good diea to freshen fluid every year or so. I take caliper loose and hold up in air and then bleed, or more forceful bleeding will do it. It can be a pain but not as bad as clutch. Rich


----- Original Message ----
From: Bob Marren <bmarren at bellsouth.net>
To: Ducati Owners Group <ducati at ducati.net>
Sent: Thursday, June 21, 2007 7:06:42 PM
Subject: Re: [Ducati] 748 rear brake issues


Ronald Betts wrote:

> I'd really like to know how air gets into a sealed system. If the 
> system does have a slight vacume, why and where does the air come in 
> at. Am I missing something here ?....be nice guys....;-}>
>
>
>
Ron, I think its due to the brake line being above the caliper and 
unless the system is vacuum bled
it never removes all the air and it eventually rises to the top. Once I 
did my SS properly it was good
until I sold it a year later. My current ride is a St 2 and the caliper 
is above the rotor and it has never
had a problem like the SS did.
Bob M


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