The Donkey and Buffalo strollers have a brake pedal and a fault starting to occur as these strollers get older is the brake pedal no longer stays in the position you set it to. This is due to a small spring powered position stop wearing out. Like far to many critical parts of the Bugaboo it's made of plastic and will wear out over time. Bugaboo would have you pay £374.00 for a new chassis to fix this fault. Thanks to 3D printing I can offer a $5.00 replacment part in plastic or $15.00 part in stainless steel that will never wear out!