OK, so I am gonna be installing a Stoptech BBK (front), and stainless lines (rear) on my 03 WRX.

My questions are:

1. I am changing to DOT4 fluid from the stock fluid, how do I go about flushing ALL the old "stock" fluid from the system, so my brake lines are full of the new DOT4 fluid only?

1.5. Are there any tricks to doing this? or am I basically stuck bleeding the brakes until I am getting the new fluid coming out the calipers on all four corners?

2. how much brake fluid will I need to do this?

Thanks in advance for any suggestions

-Ted

 

Here you go Ted. That works for WRXs, except the order is wrong. You bleed RF, LR, LF, RR on a Subaru. You'll need about 1/2-2/3 of a can of Ate or ~2 bottles of Motul if that's what you're using.

 

thanks Kevin, that answered all of my questions except #1.5.....well, it sorta answered it:

Supplies Required
You will need the following tools:

· Box-end wrench suitable for your car’s bleeder screws. An offset head design usually works best.
· Extra brake fluid (about 1 pint if you are just bleeding, about 3 if you are completely replacing).
· 12-inch long section of clear plastic tubing, ID sized to fit snugly over your car’s bleeder screws.
· Disposable bottle for waste fluid.
· One can of brake cleaner.
· One assistant (to pump the brake pedal).

So I guess that means that I am stuck bleeding the brakes until all the old fluid is gone and the new good stuff has filled the system. I was kinda hoping someone had some kind of miracle secret brake fluid replacing technique....LOL oh well, I guess that's what I will have to do then.

Thanks again for the link it was VERY helpful! :thumbs up:

-Ted

edit: also, why is the bleeding order different on a Suby? That doesnt make sense to me. Sorry for the n00b questions

 

Well, if you're using the same fluid you have now, then you could jsut bleed and top off. But since you said you are switching fluid, you have to totally flush it. The good news is, flushing is no harder than bleeding, it just takes a few minutes longer is all.

 

'nother question......

Is the Motul RBF 600 silicone based? or not

I read that some brake fluids can be damaging to the seals and other materials that make up the entire brake system, depending on what compound the brake fluid is based on. IOW, some brake systems may contain materials that will react to brake fluids that contain certain base compounds, thus causing damage or even failure to the braking system.

has anyone had any problems with seals leaking or anything else going wrong that may cause a failure when using a high performance brake fluid such as RBF600, ATE SuperBlue, or any others?

Thanks guize,

-Ted

 

No, high-performance fluids are not silicon based. Motul RBF600, Ate Superblue, Ate Typ 200, Castrol SRF, Valvoline synthetic brake fluid, all are compatible with the OE system. DOT 5.0 silicon based fluids are really only for show cars and classics/antiques that are rarely driven. Some high performance fluids are called "DOT 5.1" because they exceed the DOT 4 standards, but are not silicon based. Ate and Motul fall into that category. so, DOT 3, DOT 4, and DOT 5.1 are all acceptable, and all of the fluids you see recommended around here work with the OE stuff.

 

Awesome Kevin, Thanks man, you've got some good info in that monkey brain of yours

I appreciate all yer help, and thanks for passin' on some of the knowledge!

So, what about the bleeding order again? (look /\ 4 posts @ the quote) Why is it different on a scoob?

-Ted

 

According to the factory service manual, bleed order for Imprezas is RF, LR, LF, RR. Apparently that's the longest-to-shortest lines because of ABS routing.

 

hmmmm, still doesnt make sense to me.....but I have the Factory Service Manual for a 2002 WRX at home, I will check into that. Thanks tho!



-Ted