Non disclosure of known material defect for residential property

[Anant Garg]

Not sure if this is right thread to post this question. Let me know if that is not.

This questions is related to residential property in california.  As per California laws, seller has to disclose any known material defect in the home before they sell it. What if they hide some facts which buyer comes to know about COE ? Can buyer go after it and ask for money to fix that defect ?

For example : Plumbing in the house is end of life and need to replace it. Result is low water pressure in faucets. One of pipe bursts right before sale and seller just repair that bursted pipe although plumbing company advise to change all piping of the house and provide estimates for same. Do seller has to disclose plumbing company's suggestion that plumbing of house need to be changed and associated cost to buyer in disclosure report.? 

if seller does not disclose it and buyer learns it later and get exact same estimates and suggestion from same plumbing company. Do buyer has a case for material defect not disclosed which seller knew and can ask for repairs ?

Thanks for taking time to answer my question.