DZeckhausen

It's a good idea to use some sort of suction device to remove the old fluid from the reservoir first, then refill it with fresh fluid. That saves time because you don't have to push all that old fluid through the entire system.

There will be mixing of fluids, but this is no different than changing your oil and tranny fluid. There's always some fluid that remains behind in the nooks and crannies and, as long as you change the fluid regularly, it's not enough to matter.

Quote:

do this procedure for all the other 3 brake caliper correct? i just want to make sure that i get a complete flush..

Yes, you need to bleed all four calipers.

Although the article doesn't mention it, there is some timing involved in the bleeding process that helps get more air out. If you simply open the bleed screw and keep pumping the pedel, you may not knock loose all the air bubbles that are clinging to inside surfaces. (Visualize a glass of freshly poured ginger ale!) You need to JOLT that fluid to knock loose those pesky air bubbles. The correct procedure is to have your assistant push and hold the brake pedal using firm pressure. Then, you quickly open the bleed screw and the fluid will shoot out and into the plastic tube and catch bottle. Close the bleed screw BEFORE your assistant's foot reaches the floor. Then tell him to "RELEASE" and then tell him to "PUSH" again. And then repeat the process. Rather than slowly pumping the fluid out and leaving some air bubbles behind, you will be jolting the fluid and knocking loose air bubbles.

It also helps to use a dead blow hammer (soft faced) to tap on the calipers a few times before bleeding them. This also helps knock loose air bubbles.

Quote:

and also.. how in the world do u take out the rear rotor? its not as easy as knocking it out with a millet for the front rotor.. after i remove the complete caliper for the rear, i was stuck.. no matter how i pound, the rear rotor just would not come out..

Was your parking brake engaged? The WRX uses an integral drum in the rear rotor and the parking brake shoes will clamp the rotor in place. You need to release the parking brake before you can pull off the rotor.

Hope this helps!

DZeckhausen

I'm not sure why you think that's a dumb question! Unless you've done it before, there's really no way to know.

The brakes can be bled with 1/2 liter of fluid if you are an expert and use no more than is needed. However, if you find that there is some air in the lines or if you are a novice, you can easily end up going through a liter or even two. I would have two liters on hand it it's your first time.

The Motul 600 comes in 1/2 liter plastic bottles. That would mean you need four of them. ATE TYP 200 and ATE Super Blue Racing come in one liter metal cans.

Akiata

The rear rotors have 2 threaded holes to put a screw in and pry them out. I don't know the pitch size sorry.

tshrey

The rotors won't come off because of the brake drum e-brake - the shoes of the brake wear a small groove in the inside of the rotor and keep a hold on it.

From the back of the rotor/hub you will see an eliptical rubber plug. Remove that and you have access to a small gear with its axis running front to back. You can turn that gear with a flat head screwdriver. I think you push on the bottom to rotate it in the direction that retracts the brake shoes. Remember how many turns on the gear you made and after reinstalling the rotor reset the gear. This gear is used for adjusting the pull on the e-brake handle.

tshrey

You can strip the threads out of those holes or tear the lining of the brake shoe if the rotor is being held on because of the drum shoes. I would recommend backing off the shoes BEFORE using the bolt holes.

tshrey

I'm not talking out of my a$$ here. My car only has 8000 miles and I rarely ever use the parking brake but there was a groove in it big enough to tear the lining off the brake shoe when I used the two bolts to get the rotor off.

Unless your car has a ton of miles on it and the rotor is corroded like mad there should be no reason other than the brake shoes grabbing it to prevent it from coming right off. It takes 10 seconds to get behind the hub and turn the gear - why not do it?