Bosch 5.3 ABS modules

[Toms306]

The speedo won't be to do with the ABS pump just so you know. SOME cars use an ABS wheel speed sensor, via the ABS ECU to determine the vehicles speed for the dash display. However 306s use a speedo sender unit located on the gearbox for this, so this is where you should be looking for that fault - either the sensor/sender itself or a bad earth seems to usually be the problem.