Buick Repair Questions? Ask a Mechanic for Answers ASAP
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When you said abs system was replaced do you mean the hydraulic control assembly located under the abs module?
Loss of pressure can be caused by air in system, master cylinder, or hydraulic control assembly. Since all the parts have been replaced this would mean air is in the system but since a manual bleed isn't helping this means a automated bleed needs to be done with scantool which activates abs system to get all of the air out. To prevent this in future parts should be replaced quickly, do not remove old caliper until you have new one in hand so it can be switched out quick. If you remove caliper then run to parts store to buy a new caliper this allows air to enter system causing this problem. A shop will charge about a hour labor to do automated bleed with scantool. Let me know if you have questions, thanks.
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