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> Bleeding ABS Brakes, Hints, Tips, Tricks?
post Dec 16, 2003 - 2:42 PM
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ConeTrouble

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I am about to change the brakes on my '94 GT, and was wondering about the ABS system.

Now, a lot of ABS systems are of the closed loop variety, which means that in order to completely bleed the system, you have to do one of two things: either take it to a dealer to get them to hook up a snorkelator which electronically activates the ABS, allowing access to the normally closed ABS loop (or perhaps have one of these snorkelators yourself and know how to use it).. which is the preferred route; or you can bleed the brake lines, take the car out on the road, and slam on the brakes and activate the system (which in theory will flush new fluid into the loop), then bleed the brakes again. The latter doesn't really strike me as a very good way of doing this, as you are never sure of the fact that you got all the old fluid out.

Typically, on these closed loop ABS systems, the bleed steps are different than what you would normally expect from your plain jane brakes (i.e. you don't start at the wheel farthest from the master cylinder and work towards the closest). Looking at the Factory service manual, though, it says that the bleed steps for ABS are the same as non-ABS. So my question is whether or not the ABS system on the '94 GT is a closed loop variety, or if a regular bleed is going to accomplish a complete flush of the system. Logic kind of points to the fact that it will, but I was wondering if any of you have some input on this.

I am replacing the bleeder valves with SpeedBleeders, and going to Hawk HP Plus pads on the front. Stock Toyota pads on the rears. Fluid is SuperBlue. For those of you that bleed your brakes yourself, and haven't tried SpeedBleeders and/or SuperBlue fluid, I can't recommend the stuff enough. The bleeders let you do it yourself, and the fluid is electric blue, so you KNOW when the lines is completely flushed.

~Mark
 
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post Dec 16, 2003 - 6:15 PM
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ConeTrouble

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QUOTE (Toyolica @ Dec 16, 2003 - 10:50 PM)

How muck are those speed bleeders?


They cost me about $35. You can order them Here

They don't have the Celica listed on their web page, but they do carry them, you just have to call them and ask.

ATE Super Blue Brake Fluid is not synthetic. It is DOT4 fluid. One thing to point out to you about synthetic fluid is that it is NOT hygroscopic. Moisture can form in your brake lines under normal use, whether it be via condensation, humidity, or even washing the car. If you are using synthetic fluid, this moisture cannot be absorbed into the fluid (which is one of the reasons you should bleed your brakes and changes fluid every year or so). The result is that you have little droplets of water that form in the fluid, and if they are near the caliper, which reaches operating temperatures above 200F. If this occurs, the droplets can boil, resulting in vapor lock. Even if the little drops don't boil, just think, now you have water droplets wandering around in your lines, rusting and corroding your parts from the inside. I am not telling you not to go synthetic, but I just wanted you to be aware of the consequences.

If you are curious, you can check out ATE SuperBlue Here

It is expensive, but well worth it in my opinion.

QUOTE (Toyolica @ Dec 16, 2003 - 10:50 PM)

Not sure though.


Hmmm, you haven't convinced me smile.gif

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