Typically the SD card's SS (Chip Select) pin is 10.
Is yours really on pin 4?
No, on most boards it's on pin 4. At least that's true for the Ethernet Shield and the Wireless SD Shield, which are two of the most common shields used.
In the moment I use SPI.Begin(), the values from the probe change in second decimal plate and the signal from the probe need to be multiplier by 2.
You didn't write before that you multiply the value by two. In this case it's clear that the resolution changes. Now we have to find the reason for getting just half of the value. Do you still use mode 3 on the SPI? That won't work with the SD card, it's a mode 0 device. And in your sketch you don't set the SD CS pin to HIGH before accessing the MAX.