Relief valve poppet

I have a 2010 kubota rtv 1100k worksite model, and was wondering if anyone knew if there is supposed to be a spring that goes over the valve poppet on the relief valve? The poppet was rusted up, and I buffed it nice and smooth and it slides in and out nice now. But it doesn't seem to move when I'm applying brakes, and the cables and spring are good, and the plate that pushes the poppet in has the correct spacing. When driving it feels like the brakes are on, and you really have to get on it...

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Relief valve poppet