Unfortunately this very mechanism is also having a side effect that it makes the wheels slide instead of rolling on smooth tiled surfaces.Only if one gives downward weight on the Walker while pushing will the front wheels roll on smooth surfaces.Hence,as the wheels are sliding it's glides away very fast making the baby fall.
My advice to the makers.Please add some silicone or rubber bands on the front tyres so that it gets grip on smooth surfaces and hence roll.Giving 3 stars only for this particular feature as i feel if the tyre is not rolling properly,no use of this product.