Tiedown reverse lockout solenoid

[Dennis Man]

Could someone explain the operation of the tiedown inline lockout solenoid p/n 81103. I push on the brake master cylinder plunger without solenoid inline and fluid squirts out. Now if I put solenoid (not energized)on rear of master cylinder, push plunger, I get no fluid squirt. I thought fluid flow was stopped only when the solenoid was energized (tow vehicle in reverse)



Dennis

 

[Dan J.]

This link below might help. Click on the pdf file and it should explain better than I ever could.






http://www.easternmarine.com/TIE-DOWN-Backflow-Disc-Brake-Reversing-Solenoid-11253A/

 

[Dan J.]

An added note: I referenced the pdf for the 11253A because the 81103 was lacking, to say the least. Good luck!

 

[Dennis Man]

Dan J I saw that type when I was serching the web. But that type needs a different master cylinder than the one I have. I guess the previous owner changed out from drum to disc brakes and used solenoid p/n 81103. The unit you pointed out needs a return port/fitting to attach to the solenoid, which mine does not have. Maybe I should buy new master cylinder and your suggest style and make it right.



Dennis

 

[Dan J.]

I wouldn't change the MC unless necessary. I'm a, "If it ain't broke, don't fix it" kind of guy. :lol: What year and style boat trailer are you working on? For the most part, those solenoids should bypass the pressure when engaged and allow manual/mechanical pressure without power. Good luck!