no its deffo the brakes,after driving for half an hour when it gets hot it starts to squealin, when i press the brake when driving it goes away straight away and then comes back when i let off!! is the retainers the black plates that go on the front of the pads! do they need copper grease on them aswell cus im goin to clean them soon, I bought a can of brake cleaner today, any tips on how to clean them with it??