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Why do we measure the pressure of the caliper to the brake pads

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When you press on the brake pedal pressure is applied through the brake master cylinder to the calipers to force he brake pad against the rotor and thus stop the car. The front and rear wheels must not receive the same equal braking force. To distribute the different required pressure between front and back wheels it passes through the “Proportional Valve”. It is important when performing brake repairs or even just maintenance safety checks that the technician is able to measure the newton force applied at each wheel. To establish that the front rear pressures are in the correct ratios and that the two front wheels are getting the same pressure on each side. Likewise it needs to be established that the two rear wheels have the same pressure left and right.