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I have a 1988 Big Bear 350 4x4. I had to take apart my front brake pistons and thoroughly clean them. The internal gaskets appear new from when I had bike shop I thought do a brake repair. Seems like they just replaced gaskets and didn't bother cleaning or clearing any of the trash from system. I put everything back together and try bleeding system and pumping up brakes. The front piston on both sides will just barely build up and it does hold and when I bleed them I get a solid stream of fluid so don't believe there is any blockage. Also to note the bleed valve is after the rear piston on each side so fluid is reaching it but for some reason not building pressure I'm guessing. How can I tell if I need to rebuild my master cylinder ? Pic - the piston on left is before and right is after I cleaned one.