well it is more or less a process of elimination. if you have air in the lines you will see boubbles in the fluid when you bleed them. if you check the dept of the rear master cylinder against the lengh of the rod into that hole where it makes contact then that is eliminated. do you have the correct kind of hose from the intake to booster. a lot of people use gas line hose, instead of the heavier booster hose. That can collapse when the brakes are applied. also check the vacume one way valve on that line at the booster and make sure it is working properly.
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70orbitorange
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