When Brompton brake pads are worn past the wear-line markings, you need only replace the pad inserts, available here (this will be the case on all newer Bromptons). However, if your entire brake pads are damaged (i.e. it's not just the brake pad insert that is worn down), or if you're looking to upgrade from the older style, single-disposable-piece brake pads, replace them with this set. It includes a single pair (so you'd need to order two pairs to replace all the pads on your bike). Can be used on both front and rear brake calipers.