Brakes dangerous in rain

[Austinowa360]

Hey guys first time posting but been reading a lot on here. I have a 2007 Yaris sedan with 240,000. The car does not have abs. This is my first vehicle that has not had abs and when the roads are wet anything over 50% sometimes less brake pressure the front tires just lock up and the car just slide. I have been involved in 1 accident and about a dozen if a car would have been in front of me. The car has new tires as of 20,000 miles ago, they are mastercraft not sure what model. So my question I guess is is this normall? Or is there something I can do to make the front brakes let apt to lock up maybe rears are not pulling their weight? Thank you guys for any help!