Some boosters have relief valves. The top left one doesn't and is the 94 Astro unit. They look kind of like sight glasses from the out side. There is some clear hard stuff and a blue plastic ball stuck in the hex socket that adjusts it. Not supposed to be user adjustable haha. I think I read that they are set for 1,600 psi. In my case it was 9 turns in from the first thread when removed so that's where it will be reset.
Here is the valve and spring out of the hole. An O-ring seals it
This is the "two function valve" the yellow end lets pressure in the accumulator if the line pressure is higher than what's in the accumulator. The pin lets fluid out of the accumulator if hydraulic line pressure is lost and the pedal gets mashed far enough to push it in. That is the emergency back up.
The hat looking piece is what pushes the pin in.
Spool body plug held in with a spring clip and seals with an O-ring.
Power piston seal.
Some boosters have relief valves. The top left one doesn't and is the 94 Astro unit. They look kind of like sight glasses from the out side. There is some clear hard stuff and a blue plastic ball stuck in the hex socket that adjusts it. Not supposed to be user adjustable haha. I think I read that they are set for 1,600 psi. In my case it was 9 turns in from the first thread when removed so that's where it will be reset.
Here is the valve and spring out of the hole. An O-ring seals it
This is the "two function valve" the yellow end lets pressure in the accumulator if the line pressure is higher than what's in the accumulator. The pin lets fluid out of the accumulator if hydraulic line pressure is lost and the pedal gets mashed far enough to push it in. That is the emergency back up.
The hat looking piece is what pushes the pin in.
Spool body plug held in with a spring clip and seals with an O-ring.
Power piston seal.
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