12 can move to a lower position in the window frame than prior art brake shoe assemblies that support tilt posts in a cam near the center of the brake shoe housing referring to fig5 in conjunction with fig1 4 it can be seen that when the window sash 12 is tilted inwardly the tilt posts 22 of the window sash 12 causes the cam element 18 to turn prior the long axis 61 of the cam element 18 had been vertically oriented when the window sash 12 is tilted that orientation changes toward the horizontal the cam element 18 is oblong in shape since it has a long axis 61 and short axis 63 consequently when the cam element 18 turns the cam element 18 spreads the first arm element 30 from the second arm element 32 of the brake shoe housing 16 as the cam element 18 spreads the brake shoe housing 16 the brake shoe housing 16 flexes in its bottom section 34 the first arm element 30 and the second arm element 32 engage the side walls 27 28 of the track 24 the result is that the brake shoe assembly 19 becomes locked in position within the guide track 24 as the cam element 18 spreads open the brake shoe housing.