i'm considering a machine build based on MTB hydraulic lever brake and I would like to know if the lever, pushed by hand, will handle 13 bars /190 PSI ? I'm really new to this kind of measurement.

  • 1
    It may be helpful to know if you mean just the lever blade itself, or all the seals and other bits in the lever assembly, or everything in the entire lever/hose/caliper system. May 12 '17 at 14:40
  • 4
    An average adult grip strength is about 300 Newtons with top third of men at 500 N. Over an area of say, around 2 square inches (guesstimate) gives about 2-4 bar of pressure exerted by a human hand. So, my guess is that since you're going to a factor of 3x to what an strong human can produce, it might be out of the safety margin. But you could presumably build a test rig and actually test this.
    – Batman
    May 12 '17 at 15:54

asuming 300 N as average grip multiplied by a leverage ratio of 10 it is 3000 N of axial force. the piston diameter is about 10 mm so the piston effective area will be 0.785 squared mm. so the presure could be 3000 N/ .785 cm2 = 3821.7 N/cm2 equal to 5542 PSI. so it can handle almost 30 times what you need. the problem is: lack of power if you can only apply 190 PSI maybe the brakes wont work at all.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.