Re: Here's my experience/advice |  |  |
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In prep for my trackday, I flushed out the brake fluid in my Boxster S early this week ( it was over due anyways.)
I had trouble getting it done with 1L of fluid, or it's hard to tell when the old fluid transitions to new fluid at the bleeder. Without dye options available, it's hard to judge between almost clear of new to the light amber of old.
I was able to empty 90% of the reservoir at the master cylinder with a vacuum device, and used a motive power bleeder to do the task. I ended up with a lower level then minimum at the reservoir when done, and I topped up the reservoir with fluid from a recently openned bottle.
How much fluid do you think is in the brake lines to the back? the diameter of the tubing is pretty small... 30cc -60cc ( 1-2 fl oz?)
I had trouble getting it done with 1L of fluid, or it's hard to tell when the old fluid transitions to new fluid at the bleeder. Without dye options available, it's hard to judge between almost clear of new to the light amber of old.
I was able to empty 90% of the reservoir at the master cylinder with a vacuum device, and used a motive power bleeder to do the task. I ended up with a lower level then minimum at the reservoir when done, and I topped up the reservoir with fluid from a recently openned bottle.
How much fluid do you think is in the brake lines to the back? the diameter of the tubing is pretty small... 30cc -60cc ( 1-2 fl oz?)
| Here's my experience/advice grant - 5 years ago |
The job, IMHO, takes about 750 mL. I use a self-graduated catch bottle (coke bottle with markets made by magic marker in 50mL increments).
The first caliper i remove 250+ mL from, to accommodate for fluid in the reservoir, master and feed line.
Others I take ~150mL each. Fluid in the lines is pretty small. Watch it travel in your clear tube - and remember that clear tube is likely 4x the internal cross-section of the hard line's.
Grant
Grant
gee-lenahan-at-gee-mail-dot-com
The first caliper i remove 250+ mL from, to accommodate for fluid in the reservoir, master and feed line.
Others I take ~150mL each. Fluid in the lines is pretty small. Watch it travel in your clear tube - and remember that clear tube is likely 4x the internal cross-section of the hard line's.
Grant
Grant
gee-lenahan-at-gee-mail-dot-com
| Re: Here's my experience/advice Petee_C - 5 years ago |
Thx.
Yeah, I have a Dasani water bottle with a piece of wire taped to the side for a hanger as my catch bottle. Graduations are probably a good idea.
Since I drain most of the old fluid from the reservoir, I'll aim for 150mL from the outer nipple, 50mL from the inner nipple on each caliper. That way I should have enough to do the full brakes with 1 new bottle next time.
Yeah, I have a Dasani water bottle with a piece of wire taped to the side for a hanger as my catch bottle. Graduations are probably a good idea.
Since I drain most of the old fluid from the reservoir, I'll aim for 150mL from the outer nipple, 50mL from the inner nipple on each caliper. That way I should have enough to do the full brakes with 1 new bottle next time.
| Well, maybe 981 is larger, btu what we DO know is... grant - 5 years ago |
They are not equal. The rear calipers are smaller. The first belled drains additional lines and part of the reservoir and master... so if 1 is 250mL, the others are not. Its likely a great simplification. Since i have - long ago -- run it until the fluid goes from "darkish" to "lightish" I'm pretty confident in my measurements, for a 986/7 anyway.
Grant
Grant
gee-lenahan-at-gee-mail-dot-com
Grant
Grant
gee-lenahan-at-gee-mail-dot-com
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