Pressure Hold

When the Electronic Brake (Traction) Control Module (EBCM/EBTCM) senses a wheel slip the EBCM/EBTCM isolates the system by closing the Hold (Inlet) valve and keeps the Release (Outlet) valve closed in the Brake Pressure Modulator Valve (BPMV). This holds the pressure steady on the brake so hydraulic pressure does not increase or decrease.