First, check the surface roughness of the pressure plate. There should be no obviousgrooves on the surface of the pressure plate, and the depth of the grooves should beless than 0.30mm. Minor wear can be smoothed with an oilstone if the fiatness os surface roughnoes of thepressure piate exceeds the roguiramonts, it cabo ground fiat with a surface grinder or turnedflat with e iatno, but the thickness of tho grindin?and turning should be lass tnan 2rrn, otherwiegssure plata should be repleced