Hello all,
This is my first thread on this forum, and question how to solve problem

I have Bravo 1998 1.6 16V with ABS.
Some time ago i got ABS warning on dashboard (week after changing front wheel bearing). I checked all ABS sensors and all work fine - ABS light is still on.
Brakes works perfect for nearly 2 month without ABS but one day after work i got no brakes! Pedal went to the floor - after pumping was litle beter. Now pedal is spongy (like with air in system). I checked hydraulic system for leakage - no traces of fluid. Fluid level in tank is still the same. I'v tried bleed system - there was no air, only clean fluid from bleeding valves.
Brake are very poor and i feel that only back brakes work (back of the car is going down during braking).
I noticed that when brakes are cold only back right wheel makes marks on asphalt and all 4 wheels make marks on gravel.
After some braking (probably when fluid is hot) i noticed that brakes are lilte beter and this time right front wheel makes marks on asphalt!
What going one?
Master cylinder failure? Is possible that something wrong with ABS unit make problems?

best regards and sorry for my english

Slave Cylinder failure by the sounds of it. Its found under the battery tray on top of the gearbox, check for wet patches.

This may help...

Slave Cylinder Removal

As for the ABS error light sounds like you damaged an ABS sensor during the replacement of the HUB or you fitted a non-ABS Hub to an ABS system. A diagnostic will tell you whats at fault, but im pretty sure its to do with whatever you did near the wheel that had the hub changed.

Thank you for reply!
There is no sleve cylinder in this car. Cluch is actuated by cable.