Will the brakes of Audi a4l not turn off after changing the fuel pump?

No, the brake turned off because the fuel pressure was low and the fuel pressure was out of tolerance.

P0087–The fuel rail/fuel system pressure is too low and the failure frequency is extremely low.

Maintenance plan:

Check the low pressure side of fuel (pressure 6.0-8.0 bar, fuel supply 400 cm3/ 15 s, etc. ).

And wires/plugs/pins between the fuel pump control unit and the fuel pump. If no abnormality is found here and there is no fault after trial operation, please replace the fuel pump control unit with a brand new one, part number: 8W0 906 093 G.