replacing brake pads on 2007 Lexus RX350

my back brakes need to be replaced. how much will this cost

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3 answers
Does the Lexus RX350 have a timing belt that should be changed? I couldn't find it listed within their maintenance lists.
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If you do the job yourself it will cost you $40. If you take it to a shop $200+ and to a Lexus dealer over $300.