PO installed a Chinese brake booster a few years back (assuming it's chinese because it's rusted all over ). When the engine is warm and i press the brake it slowly starts sinking and making a hissing noise. Outside of that the brakes feel and work fine or maybe i'm just used to bad brakes on the 80. I did the FSM test when you press the brake paddle while the vehicle is running then shut the engine off. It should hold 30 sec but after about 10 sec the peddle is pushing my foot back with a surprising amount of force.
Any advice?
Any advice?
