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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Fluid coming out of a caliper means that it does unfortunately need to be replaced.
In terms of the abs and brake lights being on you will need a professional scan tool to diagnose that, in some cases it will be a simple abs/wheel sensor but in order to properly diagnose the problem you will need a scan tool. Using the scan tool you will be able to enter abs and watch each sensor to see if they are working, a dead giveaway will be if one sensor is not reading which will require replacing.
It could be related and again you would need a scan tool to diagnose the 4wd problem by evaluating the codes stored.
Thank you!- Joe
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