Location of the regulator
The pressure regulator is designed to compensate for the pressure in the rear brakes when the load on the rear axle increases. The unit is located above the rear axle beam and contains a valve, a torsion bar and an adjusting bolt.
When bleeding the brakes, the regulator is bled last.
If the regulator is not working properly, take the car to a service center for inspection and adjustment.
When replacing the regulator, place a reference mark on the adjusting nut, which should be tightened and aligned with this mark.
The official source is on the portal (Toyotaman.ru)