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Metering Valve
The metering valve section of the combination valve is required on cars that have disc brakes on the front wheels and drum brakes on the rear wheels. If you have read How Disc Brakes Works and How Drum Brakes Work, you know that the disc brake pad is normally in contact with the disc, while the drum brake shoes are normally pulled away from the drum. Because of this, the disc brakes are in a position to engage before the drum brakes when you push the brake pedal down.
The metering valve compensates for this, making the drum brakes engage just before the disc brakes. The metering valve does not allow any pressure to the disc brakes until a threshold pressure has been reached.
بس بما ان العربية ما فيهاش metering valve عشان هيا abs
يبقى اكيد العيب في الsensors و غالبا حتبقى حاجة بسيطة محتاجة تنظيف مثلا
rear brakes sensor cleaning
الرجاء الاطلاع على اللينك التالي
http://markshroyer.com/blog/2006/06/...ed-sensor.html
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