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Thanks fellas! Dabtl, I saw your posts on the remote reservoir topic. Excellent ideas! I feel better that I am on the right track with my thinking. I do think the vacuum effect is causing a hard pedal and the brake light not to function. Am I incorrect to think this? Is there a...

Well, now that I read the other posts on this issue, the master cylinder needs to be vented. I think this has has been a cause of my headaches. Every symptom I am having is occurring, hard pedal, brake light switch not engaging after driving for a while, and my grief. Guess I have to work on...

My problem is after the truck has been driven for a little while. The brake pedal gets a little harder too. I'd like to hear more thoughts of this potential vacuum effect. I'm gonna put the vent line and see what happens. I'll definitely report back.

So the my chronic brake switch issues have made me a better mechanic and also have me thinking. I recently had a hydraulic brake light switch fail, well multiple switches fail and ended up changing over to air. I also have a breather on my master cylinder cover. It was pointed out to me by a...