FJ40 Brake booster (1 Viewer)

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I've had this booster installed for several years and it works perfectly.
I just installed this booster in my '71. Does yours hiss a bit when pedal is depressed & released? Mine does, hisses both ways, but only as it passes a certain point. It functions great, too great honestly. Have had to re-learn how to drive the truck because its such a stark decrease in effort to apply the brakes versus the old setup. If it only had 50% as much boost assist as it has, I would have been happy! Willwood early disc brake conversion kit in the front, factory drums in the rear and factory front disc brake master (I think). I'm due to replace the master and service the drums here soon.
 
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