16 extends from both sides of the window sash 12 each pivot post 16 extends into a brake shoe assembly 20 the brake show assembly 20 moves up and down in a guide track 18 on either side of the window sash 12 the brake shoe assembly 20 serves multiple functions first the brake shoe assembly 20 is designed to move smoothly within the guide trade 18 as such the window sash 12 can open and close smoothly without binding or rattling second the brake shoe assembly 20 engages the guide track 18 and holds the pivot post 16 of the window sash 12 in a fixed position when the window sash 12 is tilted inwardly for cleaning or removal lastly the brake shoe assembly 20 attaches to one or more coil springs 22 that are used to counterbalance the weight of the window sash 12 the coil springs 22 are mounted in the guide track 18 at some elevation above the brake shoe assembly 20 as such the brake shoe assembly 20 and the window sash 12 it supports are biased upwardly by the coil springs 22 each brake shoe assembly 20 includes a brake shoe housing 24 and a cam element 26 the brake shoe housing 24 retains the cam element 26 the cam element 26 receives the pivot post 16.