Problems with brake systems after rains.

[Blackstare]

Hello everyone, I have been reading you all for some time now, but now I ask for advice.

I have a '11 Yaris liftback, and got into a flooded street about a week ago, just after getting out of the puddle, the rear brakes were making screeching noises and the car felt like it was not braking on the rear wheels, the problem went away as soon as the car dried up, but since then I constantly get the "slip" light on. Today the slip and ABS light came on.

I also noticed that the "brake" light does not light up when I pull the parking brake, it was working well before the water, so maybe this has to do with the rear brakes as well.

Does anybody have some advice on how to proceed before taking the car to the agency?

Kind regards and great forum!