The braking system is equipped as standard with a booster, which operates thanks to an independent vacuum pump. In addition, the Sprinter model can be equipped with various additional systems that increase safety and improve the vehicle's performance. For example, ABS and automatic differential lock systems can be installed. They are described in more detail below.
Figure 266. Diagram of the brake system with a pressure equalization valve: 1 - pressure equalization valve; 2 - front brake caliper; 3 - double pressure regulator; 4 - adjustable pressure equalization valve; 5 - rear brake caliper
Figure 267. Diagram of the brake system without a pressure equalization valve: 1 - front brake caliper; 2 - pressure regulator; 3 - rear left brake caliper; 4 - rear right brake caliper
Depending on the modification, the car is equipped with either a conventional pressure regulator in the rear brake circuit, or a dual pressure regulator with the ability to adjust and a non-adjustable pressure equalization valve in the master brake cylinder. Figures 266 and 267 schematically show the braking systems of both modifications.
When the brakes are applied, the brake discs located on the front and rear wheels cause the rotation to slow down and reduce the speed of the vehicle. When the brake pedal is pressed, the pressure rod connected to it presses on two pistons located one behind the other in the master brake cylinder, which is mounted in the engine compartment on a vacuum booster. The pistons transmit the pressure force to the brake fluid located in the master cylinder. Hydraulic pressure is generated, which is then transmitted through pipes and hoses to the wheel brake cylinders. Under the pressure of their pistons, the brake pads are pressed against the discs. When examined in more detail, the mechanism of action is as follows: since the brake caliper bracket has only one piston, the pressure created in the system is transmitted to the latter, which in turn presses the brake pad on one side. When this happens, the entire floating caliper bracket moves along the guide pins due to the pressure created, and the pad on the other side is pressed against the brake disc. This way braking is fully achieved.
The parking brake acts on the shoes through a system of levers and cables. Thanks to the special design of the rear brake discs, there is still room for drum brakes at the rear. When you press the parking brake pedal, the front brake cable, which is attached to the equalizer, is driven. A separate cable runs from the equalizer to the brake mechanism of each rear wheel. The force is transmitted to the drive lever, which expands the pads.
Material taken from a web resource (mercedesman.ru)
The front and rear brakes are adjusted separately.