Magura MT4 eSTOP Disc Brake Lever - Front Rear Hydraulic Post Mount BLKMagura MT4 eSTOP Disc Brake and Lever Front or Rear Hydraulic Post Mount Black. The Magura MT4 eSTOP disc brake is optimized for the requirements of modern e bikes. it offers controlled power for both off road and city tours and is particularly reliable thanks to optimized components. The eSTOP system is based on Maguras MT design The MT4 is proof that versatility and outstanding performance for E Bikes dont have to be expensive 2 finger aluminum