This work on the s2, Tektro P20.11 Disc Brake Pads... https://www.amazon.com/dp/B07SD3W4CN?ref=ppx_pop_mob_ap_share

Just get some new pad on Amazon https://www.amazon.com/dp/B07SD3W4CN/ref=cm_sw_r_apan_glt_fabc_0E4N643K8NN3DCHHCXDZ?_encoding=UTF8&psc=1

Buy ur self a bleeding kit while u add it...and some mineral oil u gone need it ... believe me!!!

Fireyouracing Mountain Bike Hydraulic Disc Brake DOT Mineral Oil Bleed Kit for AVID Formula Hanyes Echo Shimano Tekro HS33 Magura Nutt (Normally Combination) https://www.amazon.com/dp/B016H20J6Y/ref=cm_sw_r_apan_glt_fabc_16MX0MPHNWG22V34DMZ1?_encoding=UTF8&psc=1

SHIMANO Hydraulic Mineral Oil One Color, 1000cc https://www.amazon.com/dp/B001E4MH84/ref=cm_sw_r_apan_glt_fabc_B3ZRDK001YCD4BZV0HE6....