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Question:

What happen if I pour automatic transmission fluid in brakes system?

What happen if I pour automatic transmission fluid in brakes system?

Answer:

Once an oil based fluid enters your brake system, there is almost no way to remove it from the rubber pieces in the moving components of your brake system. It actually soaks into the rubber and causes them to swell. The rubber is specifically made for brake fluid which has quite different properties than oil or transmission fluid. Years ago using trans fluid in a pinch was touted as an acceptable idea but in any modern vehicle it is a very expensive and dangerous action. Even if you do not have immediate multiple parts fail, in time you will have premature failure of all rubber parts that made contact with the trans fluid. The longer the fluid stays in, the more damage possible. I've been a tech for 15 years and have seen this about a half a dozen times. All had multiple problems after the contamination. I wouldn't recommend driving a vehicle in this condition. Hope this helps!
May 28, 2018
A TF will not only contaminate the entire brake system, but will also quickly deteriorate any and all natural rubber components (Wheel cylindercups, disc seals, hoses, etc.) and in very short order you will find yourself with NO BRAKES.
May 28, 2018
Get it towed to a midas or firestone and have them do a brake flush, about $70. Brakes will work, worry about any other problems if they come up.
May 28, 2018

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