The U.S. aircraft register, updated daily
Parts

Disc Brake

No failure report names the disc brake. 3 FAA approvals let 3 companies make a replacement disc brake, Telair International INC holding the most (1).

Approved replacement parts 3 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a disc brake and sell it as an approved part for the models named. These are the companies holding such approvals for a disc brake:

For these models most: Douglas DC-3 (1), Boeing 757 (1).

MakerPartReplacesFitsGrantedStatus
Basler Turbo Conversions, LLCDisc Brake BTC95308549530854Boeing DC3A-SCG, DC3A-SC3G, DC3A-S1CG2018-04-03current
Gemini EngineeringDISC-BRAKE 251N2148-2251N2148-2Boeing 757-200 Series, 757-300 Series2008-08-12current
Telair International INCDisc Assy Brake 13F8113F81McDonnell Douglas MD-90-302005-07-29current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.