11.2.3. Pumping – use of a set of pumping under pressure
Use of a set of pumping under pressure demands giving to it compressed air for what it is possible to use the beefy tire of a spare wheel. Reduce pressure in the tire up to the size specified in the maintenance instruction of a set.
When pumping by this method a large amount of liquid is necessary for a hydraulic system to prevent hit of air in the main brake cylinder in the course of pumping that often occurs if liquid level in a tank is not supported.
Pumping by pressure is especially effective when the system is difficult for pumping or when full pumping of system is carried out during usual replacement of brake fluid.