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Toyota Brake Problem; brakes building pressure
Topic Started: Dec 7 2013, 04:27 PM (1,128 Views)
JellyBeanDriver


crankcase
Dec 22 2013, 07:41 PM

I don’t know what the crud was in the fluid. Does water bound dot 3 float or sink? What else could have been floating?
Pretty sure DOT3 and water are miscible (don't separate), so I don't know what was in your fluid either. Maybe some well meaning person topped it off with the wrong stuff?
Edited by JellyBeanDriver, Dec 22 2013, 07:47 PM.
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Jordan


Brake fluid is hygroscopic, meaning it attracts and absorbs moisture.

Sounds to me like someone's contaminated the system with some sort of oil. If that's the case, you're looking at replacing every component in the brake system that contains rubber, since the oil will cause the rubber to swell up and lock your brakes.
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Metromightymouse
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Powdercoat Wizard

The posts above are likely spot on. You might cut open the old brake lines if you still have them. If they are all soft and disintegrating then what ever was in the brake fluid ate them up and it likely did the same to all the other rubber in the system. Full replacement, front to back is the only solution as the damage is already done. if the lines are already gone you can bleed the system in another week or so and any further particulate in the fluid or discoloration will indicate that the fluid has damaged the rubber. It will also continue to seep out of the lines and other rubber and re-contaminate the fluid, although to a much lesser extent.

Your brake system should be LF and RR, and RF and LR tied together. The reason you had a problem with both front brakes is the calipers are more sensitive to pressure issues. The drum brakes in the rear have strong springs to pull them back after you release the brake. If the issue was in just 1 half of the master cylinder or in the proportioning valve then you would get an issue that would show up in diagonally connected wheels.
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