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Discussion Starter #1
I am new to the site, I am looking at purchasing a 2019 Forester Limited. During operation of the VDC, TCS and torque vectoring systems when the brakes are pulsed does anyone know how the brake pressure is created? No one I have found at any dealership can provide the answer to this.
 

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the master brake cylinder provides the force , the brake booster multiplies the force, so your leg/pedal force is more, that works until the abs system kicks in [ torque vectoring uses this system as directed by the ecu] with abs, system, then uses the system to hold force amplify force or extend or shorten force duration, direct different amounts of force or duration to different wheels to control traction thru solenoids and/or one way electronic valves depending on system design used, ,............. subaru uses a ceramic pads and rotors designed for ceramic pads, and works well, frankly if the dealer techs or service guy cannot even tell you these basics, .................then imo, dont let them work on your car as all they will admit to knowing is
a very basic knowledge ,
 

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2013/14 2.5i-L CVT
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does anyone know how the brake pressure is created

By the vehicle's normal brake booster. Instead of you applying brake peddle pressure to open the booster valves, the electronics do, not just to activate VDC, TCS and torque vectoring, but for Eyesight activated braking too (when fitted).

Eyesight pre-collision braking will apply greater brake force than humans generally do. Most drivers won't brake hard enough to activate ABS even in the most dire situations.
 

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Discussion Starter #8
THANK YOU... Iceland and slothman. Finally answers that make sense. As far as the Techs knowing how the systems work, I have been to multiple dealers for Subaru, Nissan, Toyota and Honda and have found no one in Sales or Service, Service manager or Techs who understand how the torque vectoring technology works in a modern AWD system, I am afraid that all that is being taught to Techs these days how to download the fault computer, if there is no code there is no problem.
 

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2015 XC diesel CVT
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ABS systems have a hydraulic pump as well as a bunch of valves. Valves alone could modulate the pressure you apply to the pedal (which is assisted by the servo booster) but the pedal would slowly sink to the floor. The hydraulic pump "pumps the system back up".

All the other modes- TCS, VDC etc- use the pump to make the required pressure.
 
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