1 Answer

Nothing good. Brake fluid is usually much higher density hydraulicfluid as well as different type than is power steering fluid. In vehicles with ABS systems it will damage sensors and seals, and in any vehicle it will result in spongy, poorly operating brakes and damaged seals.

If you're lucky and haven't driven the vehicle yet, DON'T. DO NOT operate the brakes, you may be able to remove the powersteeringfluid before you cause this damage. Use a turkey baster (seriously, they're cheap), or a syringe or similar device to drain your brake fluid reservoir of as much fluid as possible, refill with proper brake fluid, mix it a little if you can and drain it again to be sure. Refill the reservoir. You may wish to consult a mechanic about whether to flush the entire system or not afterwards.

Alternatively, if the brakes have been used, you could be looking at a very expensive repair bill. As mentioned above, powersteering fluid will damage sensors and seals, which means every part that has either or both, will need to be replaced or have the seals replaced, AFTER the brake lines have been flushed. If your mechanic has already told you this, trust him, he's right.

Read more: http://wiki.answers.com/Q/What_happens_if_you_put_power_steering_fluid_in_brake_fluid#ixzz1ukkjBfxp