>> I eventually changed them for the first time at 76,000 miles when they were fag-paper
>> thin.
>>
When they had been dangerous for some time then....
wafer thin linings often break away from the backplate, causing lack of braking and damage to discs.
also allows more heat to transfer in the caliper, causing brake fade/boiling brake fluid.
Pads are recommended to be changed at around 80% wear for these reasons....
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