Crumping noise comes on an off about every 30 secs looks like it coming from the

Hello, Your vehicle is in the correct year range for a recall involving the brake booster (the part that the master cylinder is attached to). Though the vehicle is 15 years old, I would contact Lexus with your VIN number to inquire whether or not you have the faulty brake booster installed from the factory, or if the recall was ever performed. Even if the recall was not performed, or if the vehicle is no longer eligible due to age or mileage, it will still provide you with insight that may solve your issue. If not, and based on the description of the noise, it is better that I do not speculate, as diagnosing the issue will require the vehicle's presence.