They won't necessarily make noise. Your car probably has wear sensors and the pads have worn down to the sensors. It won't be long before it'll be metal-to-metal contact with the rotor. It is the nature of the system for the dash light to go on and off. You need your pads changed, again. Putting off the work can result in a more expensive $$$ repair.

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95 E320 Cabriolet, 159K