https://www.cnc-bike.de/product_info.php?products_id=17845 Cheap MT4s if you get rid of the little switch in the lever.
Those are really old - look at the master. Not that cheap for lower tier ten year old brakes!
@Tijmen started
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https://www.cnc-bike.de/product_info.php?products_id=17845 Cheap MT4s if you get rid of the little switch in the lever.