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Visual Inspection Back Of Wheels and Along Lines Front And Rear--Check Back Of Master Cylinder (will have to be unbolted and moved slightly away from booster) If Found Wet- Master Cylinder Leaking From Rear--If Vacuum Booster--It Will Fail Soon
Buy As A Combo--Already Together--For Best Warranty. NOTE: DO NOT FOOT BLEED--Gravity or Pressure Bleed Only In Sequence RR-LR-RF-LF
Check the brake fluid in the master cylinder, it might be low, if it is, use dot 3 brake fluid and fill it. When the fluid gets low, it will cause a red light to come on. Have the brakes checked also, they might be worn.
Check the rear brakes are not leaking, or have air in the fluid feed line.
If above OK, it's probably caused by a faulty master cylinder.
(To check :- Slacken off the master cyl feed to the front (then rear) brakes, and observe if any fluid is being delivered - if not it is definitely a master cyl problem).
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