adjusting the trackpad click
How do I adjust the trackpad on my Retina MBP? The mouse click suddenly became almost impossible to make happen.
2.4GHz, 2.7GHz, or 2.8GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.8GHz) with 6MB shared L3 cache.
If cleaning didn't help you'll need to get your system to an Apple Store for repair. Given the age of your system I would think it would be under warranty.
There is no IFIXIT guide for the retina models to remove or repair the Trackpad due to the fact you will destroy the battery in the process!
The best I can offer you is this IFIXIT image of the trackpad on a different model: Trackpad. Here you can see the adjustment screw which is the large head screw on the left side. The screws circled are the ones you would need to remove to fully remove the unit.
Again this is a very big job as almost everything needs to be removed to get to the trackpad.
Did you by chance spill something onto the trackpad? If you did you may want to try cleaning the area. Carefully moisten a paper towel with some kitchen counter cleaner like: Fantastic Remember! Don't spray any cleaner onto your system, wet the towel you don't want the cleaner to go to far here.
Once your sure the trackpad edge is not gummed up so it can move you may need to adjust the click plate from the inside. Sadly, you'll need to remove the glued in battery to get to it which means you'll need to replace it in the process <Ouch!>
Frankly, if cleaning the top didn't free it up I would get your system to an Apple Store for them to repair it. It might even be covered under warranty!
Hi, bit late in replying to this but have just come across it. What can happen is that the batteries age and swell up slightly putting pressure on to the underside of the trackpad, so affecting the click ability. The batteries tend start to fail after about three years. They're glued in so difficult to change unfortunately.