. Release Button Repair The old pull up release button (Gen 1) rarely fails which is fortunate, as you have to drill out the rivets in the handle holding the hubs to pull it out. The (Gen2) is easier to get to which is fortunate as it does fail and can be your problem the most common fault being the two screws holding the rod coming loose. From the brake (left) side remove the two Phillips screws and the inner half of the assembly will come off rocker button attached. The brake lever, inner brake release button and spring will be loose so carefully place aside in a small container till ready to reassemble. The right side has no screws it just clips together. Use a small flat blade screwdriver to pop the joints on the front and back edges, the inner plate with rocker button attached will come free. There is a metal plate sitting over the hole the rod is in. Take time to remember how it fits in the hole and the angle you take it out. This will make putting it back much easier. The wire rod runs though a white plastic block clamped by an inner metal block with two inset hex screws. The hex key is 0.05 inches or a 99-20 if you have Xcelite hex drivers. Adjust the rod by pulling a few mm though the block and relocking. Don\'t take up any more then required to unlock the hub other wise the locking rods won\'t fully engage in the hubs when locked. Hub Repair 1/. Remove the capped star lock washer. Use a small painters knife to protect the plastic first hammer the knife in between the dome and the plastic, then hammer a large flat blade screwdriver in between the dome and the knife. Work from one side than the other to "walk" the dome up and off the shaft. There may be a second plain star washer under the Dome you can use a small screwdriver to "walk" that up and off too. Note it is best to open and repair one side at a time, so your moving and flexing one side of the handle does not dislodge parts in the other side. The hubs and disks are mirrors of each other and not interchangeable the locking rods are interchangeable. Bugaboo designate the side with the brake lever as left, the Bugaboo parts will have an "L" after their serial numbers. 2/. Check the hubs for wear. If too badly worn or damaged you will have too much movement in the locked position. You can fix this by cutting a 20 mm section of a 3 to 4 mm house nail drilling a hole the same as the nail in the damage hub wall next to the pin then epoxy it in. 
3/. There are three parts in the hub, a plastic disk and two aluminum-locking rods. The disk has two plastic pins that move the locking rods in and out of cannels in the inner hub. Why Bugaboo use plastic for this vital component is a mystery to me? If you need to repair the disk you can try drilling out the pin stumps and using a cut down 4 mm cap bolt. 
Or (my preferred choice) have a new disk fabricated that will last a lifetime. The locking rods if broken can only be replaced, either by ones salvaged from another frame or new laser cut or 3D printed copies. I prefer the copies as they have been cut / printed from stainless steel. I sell both metal $30.00 and plastic $10.00 disks, and the stainless steel locking rods $16.00 each direct from <shapeways.com/shops/bugabooparts> Shipping is only $6.00 to USA $9.50 EU and $20.00 for the rest of us 8-( If you are in Australia or New Zealand contact me directly [email protected] for better shipping direct from New Zealand 3/. Reassemble handle locking hub and check operation. If wire rods seem to be in the incorrect position try pulling the handle up to it\'s full extension, if that does not work loosen the top plastic fittings where the handle extends from by removing the small self-tapping screws (note I\'m now finding some frames now have pop rivets, drill them out and replace with self tappers) and wiggle things into alignment. (I use a small amount of the silicon grease used for taps to give a smooth action) If all is working well fit the new capped star lock on the hub shaft and tap home. To protect the dome finish I use a large socket from my socket set and an old rubber washer from a toilet cistern. Repeat operation on the other side if necessary. Once repaired, I can\'t empha enough, the need to keep Bugaboo hubs well lubricated. They have to endure incredible forces from the handle. To give you some idea, a crow bar of the same length can pull six-inch nails out of hard wood! If you have further questions or require other parts you can contact me
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