[mathanery]

Last weekend I hooked a small boat trailer to my GMC Sierra and drove to the marina, and on the way back the whole truck shook when I braked on the slope. The pedal also felt softer than usual, which is not normal for me. I live near Umm Suqeim, and the truck has about ninety thousand kilometres. I think the pads and discs are the first ones. My neighbour says towing just heats up the brakes and the shake will go away. A friend says a shake under braking means warped discs, and that towing with weak brakes is risky. I looked online for a Trusted GMC brake service near Umm Suqeim, but every page said the same thing, so I still do not know what a proper check includes. Should the shop check the pads, discs and brake fluid together? Can hard use like towing make the fluid old faster? Do heavy trucks need stronger pads than normal ones? Is it safe to drive for a few days if I do not tow anything? Is it normal to ask for the old pads back? How long does the job take, and what should it cost on a big truck? If you tow with a GMC or a similar truck and had this problem, please tell me what the cause was, what you paid, and what you would do differently. Easy answers help me most.