Dear Opponauts,

As usual, resorting to the brilliant shared knowledge here for some help hopefully on a topic I'm absolutely lost on.

Since the day I bought it, my 2005 Legacy GT has had a wobble when braking that seemingly comes and goes for no known reason. Previous owner installed a big brake kit (sigh, brand unknown) - with large slotted rotors, and calipers much larger than stock. I love the performance and the feel...when they work right. Potatocam picture of my car from when I bought it, you can somewhat see the large rotors and calipers on here too:

Here's what happens - when I brake softly I feel a horrible wobble through both the wheel and the pedal. Definitely from the front wheels - my senses tell me it's the left wheel. Kicker is, the car will go months without ever feeling this, and then suddenly it returns - currently it's back and happens everyday - but only on soft braking. If I brake with a good amount of force it's smooth and not wobbly at all.

I've had my mechanic look at my pads and rotors - both of which he says look fine, no warping on the rotors. I had some pretty bad wheel bearing noise developing, I thought the worn out bearings might be causing this - replaced the hub assembly recently, but still no fix to the wobble. I've rotated the wheels and had multiple sets of tires mounted and aligned, still same issue.

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Any ideas? Would it be worthwhile to disassemble the calipers and clean them out, to make sure they're working properly (would a mechanic even be able to fix this though, if it's not?). I know it's less than ideal, but my mechanic said he could try resurfacing the rotors to see if that would fix it as a last resort. Worthwhile?

Taking out the brake kit and replacing it with OEM parts would cost over a grand, and would result in significantly lesser braking performance - so I'd like to try salvaging my current setup if I can.

What would you do to try fixing this, OPPO? Anything you would do that I've missed at this point?