It's very common know for companies to use drums in the back especially with lighter vehicles. Volkswagen for the longest time wouldn't even use 4 wheel disks. Said it was useless (that changed though) think about it , for the longest time ever one and their dogs was placing ABS on their cars. The problem was a lot of ppl didn't know how to use them. Duh , slam on the brakes and don't let go. Yes the shaking of the car is what's supposed to happen. The brakes are release a lil at a time so your car doesn't go into a four wheel power slide and crash. The problem was ppl where feathering the brakes and thus ABS became a useless upgrade. Drums are comparable to disk with an experienced driver. Although I would love to have the GTS brakes much better. Though if I was still in Canada pulling my E -Brake at ever snowed corner I'd deff. take the drums back.
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