95 Buick park ave?

My brakes on the front passenger and rear driver work. I have flawless fluid pressure from master cyl on the rear line and non-existent on front rank. I loosen lines comming off abs pump and fluid from rear 2 lines and none from front 2 lines.any oblige as im totally baffled.

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THERE IS A SPECIAL BLEEDING PROCEDURE FOR YOUR VEHICLE,GO TO PARTS STORE AND GET THE PROCEDURE,IF YOU DO THE STEPS YOU CAN RUIN YOUR ABS UNIT BY NOT RUNNING IT PROPERLY.

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Answers:    A mechanic can power bleed them all four at once. It works.
THERE IS A SPECIAL BLEEDING PROCEDURE FOR YOUR VEHICLE,GO TO PARTS STORE AND GET THE PROCEDURE,IF YOU DO THE STEPS YOU CAN RUIN YOUR ABS UNIT BY NOT RUNNING IT PROPERLY.

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If you can find your hands on the (TSB) Technical Service Bulletin # 535001A, it will explain what may be your problem with the ABS & ABS/TCS Pressure Modulator Valve Assembly.

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You might need a tentative Metering valve(or combination vavle).Metering valves prevent the front brakes from applying braking untill the aproximantly 75-135 psi has built up within the system.The vavle is located in the line to the brake disc. Are you low on brake fluid?They hold dual master cylinders where it runs on seperate circuits so if the rear brakes backfire the front would still work.check to make sure you have fluid so you know its not leak out .Other than that look into repairing the line, it may have be pinched closed somehow.If you take it to a shop and put it on a lift you will hold a better visual of if its a pinched line.Good luck
If you can find your hands on the (TSB) Technical Service Bulletin # 535001A, it will explain what may be your problem with the ABS & ABS/TCS Pressure Modulator Valve Assembly.

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