master cylinder parts

Post by **whilst** » 23 May 2016, 14:30

Replacing master cylinder, I came across 2 plastic (nylon) 'hoogies' in the inlets where the reservoir installs.
Anyone know what these are and their importance / function?
Disc bottom w/ 3 holes(ports) and a post sticking up towards reservoir.
Rebuilt Cardone doesn't come with them,so.....

Post by **jreed** » 25 May 2016, 05:00

Are the pieces you're referring to shown in the image below?

: Screen Shot 2016-05-25 at 6.56.49 AM.png (541.67 KiB) Viewed 1018 times

Post by **whilst** » 25 May 2016, 09:56

Nope. Are you referring to reservoir 'nipples' for ABS feed? Or a clutch.
I'm talking about inside master, they are under rubber seals for res and protrude up through and into reservoir 'pipes'.
FCP sent me a PDF blowup. #8 for those with VADIS,etc.
I've come to believe, that they are in there to prevent "bottoming" out of res tubes into Master.That would hinder flow,possibly stopping it altogether.
They help fluid 'feed' into it, hence the 3 port holes in bottom disc.
My reasoning,anyway.
Best,Jeff

Post by **whilst** » 03 Jun 2016, 17:55

FYI: Volvo dealer printed out Factory info sheet on brake hydraulic system.
"The brake fluid reservoir connectors have >safety valves< which are normally open. If the reservoir comes loose(?), the safety valves will shut to prevent brake fluid escaping".
I personally don't see how they could work that way, since they have 3 holes in the bottom disc...?
A puzzler for sure.
Now you know.