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Old 09-10-2009, 09:53 PM   #11
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Re: brakes and need pedal.

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Originally Posted by C00LR
I had a good look today laying on the driveway under the bus and looked at the vacuum system. I found I have not one but TWO boosters under there. There is TWO tanks like Redbear was talking about for resivoirs. I DO have a vacuum guage. At idle the vacuum guage reads between 20 and 25... is it pounds??
Nope, not pounds, actually inches of mercury (usually abbreviated in/Hg). Believe it or not, this is the same measurement they use for barometric pressure when forecasting severity of hurricanes, etc. However, that is another story. The short answer is that 20-25 in./Hg is adequate for your vehicle since maximum vacuum you could produce under any normal circumstances would be about 30 in./Hg. That is as close to a perfect vacuum as you will accomplish without visiting outer space or a cryogenic vacuum chamber. From your description of sight, sounds, results, it would appear that your vacuum system and reservoir are working properly, now finish the repair on cylinders and such and you should have great brakes. Don't forget to do a final bleed after all repairs, and check that fluid is freely flowing from bleeder screws. If it isn't, you may also have collapsed lines which should be immediately replaced. I wish you the best, keep 'em rollin'.
Lee
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Old 09-11-2009, 10:44 AM   #12
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Re: brakes and need pedal.

I'm in Kansas. No mountain passes here. Since my bus only goes 45 mph I dont forsee any long cross country trips any time soon. Until later when I buy the right lottery ticket and can afford to have 2 speed rear end put in or something.
Its raining out right now so I really dont like the idea of creeping around under the bus today in the rain water running down the driveway.
We changed out ALL 4 wheel cylinders yesterday. Now I just have to run a couple new brake lines and see how she stops! I also took off the diff cover and drained the oil out and re sealed it since it was leaking. Just need to refill the diff before I drive.
Wow those cylinders all had crap and to use a technical term from Tygercub, full of "GACK" rusty goo, almost like peanut butter in there. I really dont see how I was stopping at all!!
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Old 09-11-2009, 10:46 AM   #13
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Re: brakes and need pedal.

Thanks for the clarification Wulf. I've always wondered what it was measuring on the vac guage. I still wasnt completely convinced that the booster or boosters as I found were bad. something just didnt ring right with me on that. We shall see later today or tomorrow when I go for a test drive. !!
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Old 09-14-2009, 11:05 AM   #14
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Re: brakes and need pedal.

Got the rear brakes fixed!
4 new rear wheel cylinders...$300
1 big ol' stupid socket to get the axle retaining rings out...$65
2 new brake lines and brake fluid and some other stuff...$20
being able to stop...PRICELESS!!!
We found crap in all 4 rear wheel cylinders and I wonder how I was stopping at all!!! replaced them and bled out the air. Still need to do it again but I have the black marks in my driveway to prove she will stop now! yee hawww!!!
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Old 09-14-2009, 03:52 PM   #15
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Re: brakes and need pedal.

true that! I'm almost afraid of what I might find though. LOL I think I need to let the bank account build back up again before I do that. I really hadnt expected to spend that much $$$ on rear cylinders!!
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