When the brake fluid disappears from the VAZ-2110 expansion bacht, if there are no trace leaks under the bonnet, the rear brake cylinders should be checked-the liquid may go through them. The cylinder needs to be taken apart, without swinging them from the axis, and installing new salamers. The average service life of the salms is not less than 50,000 km, but due to overheating or the operation of the car in severe frosts, their resource can be significantly reduced.