[gsw_fanatic]

Hi forum! Noob question here:


I'm replacing the brake fluid on my 4,000 mile old car for some high temp fluid. With the "old" fluid being relatively new, I don't expect it to be discolored. How can I tell it's been flushed out and I'm getting new fluid on the bleed screw?

[cellsafemode]

Without a color difference, you really can't simply by bleeding without letting it drain and get air in the system using a vacuum/pressure system.

if you want to get ocd about it, you'll need a tool that can activate the ABS modules to get the fluid out of them as well as simple bleeding wont purge them.

any other solution is probably just guestimating how much each line to wheel can carry and filling and bleeding that amount. But you'd still need to play with the abs module to clean it out too.

[m3bs]

My method. YMMV.

I used a syringe to suck as much old fluid out of the reservoir as I could without uncovering the ports. It took almost 1/2 liter to refill it. I then bled about 1/4 liter from the first bleed screw in back to purge the long line, then did about 10 pedal pumps on each bleed screw after that with the pressure bleeder attached. Total volume about 1.5 L. On subsequent bleeds using the same fluid usually use 1 L as I don’t drain the reservoir. I push a liter through the system before each track event. Perhaps overkill, but after 30 years on track, I’m not changing up my game now.

I also use a syringe with a tiny hose (helps to have a vascular surgeon friend..) to remove the residual fluid from the bleeder screws so it doesn’t weep out when it gets hot.

[gsw_fanatic]

Thanks guys! I'll go with m3bs method, and hopefully there's a bit of a color difference even though the car is not that old.

[slimjim2525]

There wont be a color difference. Drain 250cc out of the rears, and 150cc out of the fronts. That's what I did.

[6spdhyperblue]

Originally Posted by gsw_fanatic

Thanks guys! I'll go with m3bs method, and hopefully there's a bit of a color difference even though the car is not that old.

After you add new fluid to the reservoir at the beginning of the procedure, pump the clutch 200 times.

[getchapull]

Originally Posted by 6spdhyperblue

After you add new fluid to the reservoir at the beginning of the procedure, pump the clutch 200 times.

https://www.camaro6.com/forums/showthread.php?t=545244