
The hydraulic drive pressure regulator on vehicles with a split drive on the sides is designed to adjust the brake fluid pressure when braking the vehicle in order to prevent the rear wheels from locking when the vehicle is partially loaded

Before assembly, the spring sheets must be lubricated with graphite grease.
The springs are assembled in the device shown in Fig. 1.

Disassembling the ZIL-5301 pneumatic hydraulic booster
Disassembling the pneumatic hydraulic booster (PGU) for repairs is usually done in the following cases: fluid leaks through cuffs 29, 33, due to their swelling when using low-quality fluids; when the cuff of the pneumatic piston 23 wears out.
The probability of failure of other parts is small

A two-section brake valve is used to control the actuators of the vehicle's service brake system. The two-section brake valve is mounted on the front shield of the cabin.