Does ALL the brake fluid get out of the brake system?

XCHCUI

MEMBER
1990 OPEL CORSA
1.6L
4 CYL
FWD
MANUAL
230,000 MILES

Hello.

If I open the wheel cylinder nipples and let the old brake fluid, flow out of the system(into a bottle) by gravity,
will ALL the brake fluid in the system flow out?
At the image of the dual master cylinder that I attached, it looks like that the brake fluid in the circle parts, which I marked as A and E, will not flow out.
Will the brake fluid in those parts(A and E)really stayed in the master cylinder or will they, also, flow out of the system?
I will very appreciate if you can answer directly to my question.
Thank in advance.

4 Replies

WRENCHTECH

MECHANIC
20,761 POSTS

There is no picture here but I can tell you that any one wheel will not drain the master totally. The master separates 2 wheel brake systems and holds 2 reserve reservoirs so if one runs out of fluid, the other will still work. Some separate front and rear, others separate them diagonally.

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Sunday, August 3rd, 2014 AT 6:01 AM

XCHCUI

MEMBER
91 POSTS

Hi Wrenchtech.

Here is the image.
And I meant that I open all the wheel cylinder nipples, not just one.
I hope, that addition information will help you answer my question.
Thanks in advance.

Image (Click to make bigger)

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Sunday, August 3rd, 2014 AT 1:00 PM

WRENCHTECH

MECHANIC
20,761 POSTS

A and E are pistons and solid material. There shouldn't be any fluid there.

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Sunday, August 3rd, 2014 AT 1:04 PM

XCHCUI

MEMBER
91 POSTS

Wrenchtech, you are disapointed me:(
If you look carefully at the picture you will see that these parts contain fluid(around the solid material).
Look at the equalization ports, imagine the process, and you will see.
It looks like the rubber seal wont let the fluid get out but maybe it will flow through the equalization ports and down to the pipes?

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Sunday, August 3rd, 2014 AT 1:38 PM