Brake Reservoir Cap Parts Break down help

[keitaro]

Good day! So i am building a brake pressure bleeder out of a garden spray bottle. I just bought a used brake cap and took it apart. The car that i am trying to bleed is a 2005 Honda civic. The following image below is the break down of the cap (bought one from a junker) What is the rubber part on the right for? Also what is the purpose of the white part? Also in the reservoir there is a screen assy. is it removable? Thanks

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[sl33pyriceboi]

i believe that white part holds the black rubber, which "seals" the cap from the brake fluid spilling if somehow ur brake fluid boils n spills out.

[04 Honda Civic]

The rubber probably locks out moisture. The screen does come out, get a grip on it and it pulls right out.

[gearbox]

yeah you really dont want dirt and water vapor in the brake fluid so the cap is very well sealed.

[keitaro]

Thanks guys for the help

So i've modified the cap into what i want to be. I had to take the white part out and use a 3/4" scotch-brite pad and grind down the center raised portions.

I am going to take some RTV and seal the white part onto the cap (fillet seal). I then put the rubber on, and punched a hole through the center to allow for a fitting to pass through. I am going to seal the rubber to the white part, as well as seal the area around the fitting where the rubber meets.

If this works out, i'll take photos.

[04 Honda Civic]

guess this didnt work?