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Filler is one of the ingredients functioning as a filler of ribs from a paved mixture.. In a flexible pavement structure, the surface layer is the most upper part of the pavement which acts to hold the wheel load and also as a dense layer of water to protect the required road body, with a minimum thickness of 4 cm. This research was conducted by experimental method aiming to know the highest stability value using volcanic ash deposits as a substitute for cement in the filler.The deposits of volcanic ash used are 0%, 25%, 50%, 75% and 100% of the filler weight. The specimen material consists of several types, namely Marshall, PRD, IP, and GMM specimens. Concrete asphalt mixture is designed on the basis of the Marshall method. The results show that the volcanic deposit content is 0% with a stability value of 1133 kg, 15% with 1151 kg stability value, 30% with 1076 kg stability value, 50% with 1056 kg stability balue, 70% with 1048 kg stability value, 85% with 1047 kg stability value and 100% with 1121 kg stability value. From these variations, the highest stability value is found in 15% volcanic ash deposition with 1151kg.