you've "invested" about 2000€ in a car that costs 1000€. I guess that you hate but you love that car.
I had simillar issues with my antiquite but where I live the parts and the labor are way much cheaper.. I meen a break pump will cost me about 80 leva (which is 40€) and the work for replacement will be around 20 leva(10€).
..Btw great job disassembling and fixing the turbine yourself! : )