Codes ABS VSC

My 2008 was showing codes ABS VSC and a circle with an exclamation mark and the word Brake appeared in red on the left side of the dash, but the emergency brake was not on. I took it to my mechanic and he returned it with the following report:
"Received codes B1421-Solar Sensor circuit (pass side) (sensor is not there) , B1433 -- Air outlet damper position sensor circuit (this is for blend door motor, C1319-changeover solenoid (SCSS) . Tech cleared codes, code came back immediately. Tech followed steps to check system. Checked Aux Battery. Tech recommends replacing booster master unit as well as combo meter.
"Estimate:
Brake Actuator 1767.49
Combo meter 439.81
Labor 519.75
Total 2727.05 plus tax

They said the car is driveable with regular, not antilock, brakes. How dangerous is this? Is this report reasonable? Is the price to fix reasonable? Can the car be sold in this condition?