The maximum pressure in your hydraulic brake lines is estimated to be 85 bar. How thick does the shielding of those lines need to be?

1. min. 1mm steel or 2mm aluminum
2. no shielding is required because brake lines require no shieldingCorrect
3. no shielding is required if the pressure is below 95 bar (9.5 MPa)
4. min. 1mm aluminum or steel