Re: Trailer Brakes @#@#$^@#$
When its tightened down, the bottom is just like any regular bleed screw and seals off the caliper /wheel cylinder. When you back it off that 3/4 turn or whatever, it unseals that orifice that is used in the standard bleeding procedure. Only difference is that this one has a check valve built in that lets fluid out, but when that pressure is relieved the check ball keeps air from coming back in. I've put them in every vehicle I've had for 10 year or more now.
There going in the boat trailer after I finish my coffee ;D I'm glad Saltwater Sunday is back on.
Airslot
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