Ok, so my cousins got a high end Nordic Track cross country bike from the 90's with mechanical disk brakes. It has not gotten much use until the last 6 years. The problem is the rear brake has lost most of it's stopping power. It will stop a spinning wheel off the ground no problem but when ridden the brakes wont even make the rear tire skid.no matter how hard the brake lever is pulled. The bike shop replaced the rear caliper and it yielded barely any improvement.
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