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Old 11-06-2017, 09:45 PM   #2771
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if failure is one of the main keys.. what about a mechanical brake solution for the rear discs (or drums whichever you have).. that would be a cable solution.. enough pressure to get one stop out of it.. combined with your downshift.. or perhaps a much heavier mass 12" drum on your transmission?

even with my standard mass 10" drum I did an experiment and was able to stop redbyrd.. slammed it to 'L1' and actuated my brake lever.. the transmission wont destroy itself.. it only downshifts when its safe to do so and not over-rev the motor.. and yeah the drum got hot, didnt burn it up and it didnt smoke like crazy but it smelled warm.. .. but the bus did stop in a pretty reasonable distance.. main reasoning is i wanted to know if the "parking brake" could also be an emergency brake..

with a larger diameter and mass drum it couldve slowed me down faster..

just a thought..

-Christopher
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Old 11-06-2017, 11:09 PM   #2772
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I have a full sized driveline drum brake installed but only consider it as a failsafe mechanism. I'm just really uncomfortable with having that clutch master as the sole device controlling the dual pot main master. The all mechanical connection to the master gives me a much more warm fuzzy feeling.
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Old 11-07-2017, 07:27 AM   #2773
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I do agree on the mechanical connection feeling better.. though if it ends up being a myriad of cfranks / linkages, and such then it ends up being more failure prone than the hydraulic line.. a pin falls out / bolt breaks / lever jams, etc..

if you can do a mechanical linkage with very few moving parts then I say go for it.. otherwise i say think logically and methodically into the possible failure points.. and the failsafe systems..

in a simple pedal with a pin to the master system.. we both know that almost never fails.. the master cylinder itself may fail.. but normally with lots of warning and only one of the 2 brake systems being compromised.. in that sense, the clutch master is a lot more likely to fail than a simple (standard car) system.. as we know people's hydraulic clutches die now and then..

add cranks and more pistons, pins, levers.. and at what point does that system surpass in the likeliehood of failure.. theres no data to know.. because manufacturers dont build them that way..

but ultimately your failsafe is your backup system, designed to stop you in the event your hydraulics fail.. pretty much the reason for having installed it..

if there were some way to have a simple pedal to master then thats the best.. (and how you wouldve built it if it was feasibly possible)..

-Christopher
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Old 11-07-2017, 11:08 AM   #2774
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Hey Christopher --- I absolutely agree. The simpler, the better. Which, given the space restrictions that came along with this rig, have been difficult to adhere to design-wise. I'm as loyal a follower of the KISS principal as you will find, but sometimes you have to adapt to what you are working with.

In this case, I am more comfortable (so far) with the mechanical linkage idea than I am with the single hydraulic point of failure possibility. Even involving three bellcranks.

Everything will be overbuilt and doubly secured. Two of the brackets will be made from 1/4" plate and one machined from 1/2-3/4" stock, the rods will be either 3/8 or 1/2" and all pivots will have both retaining rings plus cotter pins. As noted earlier, I am going to run the design past a local builder who has many years experience resolving such issues before proceeding. It is actually simpler than it sounds.

Hope to get with him today or tomorrow.

I'll let you know if he breaks out laughing.
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Old 11-11-2017, 09:11 AM   #2775
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OK...I met with someone who has a great deal more experience (and skill) than I at building a wide variety of vehicles, and after much crawling under, measuring and such, he concluded the design I had was the best solution to a tricky situation.

And that was after he tore his scalp open and bled all over the place.

I had no sooner finished the sentence..."be careful, there are a lot of sharp things hanging down under there"...when I heard the yelp. Poor guys bald head took a really nasty gouge but he quickly went back to the business at hand after a band aid and mopping things up. He is obviously a Pro.

He had a number of detail ideas and shortcuts that should make for a very solid mechanical system of actuating the brakes. I will tighten up my drawings and measurements and we can get started fabbing.



ONWARD!
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Old 11-11-2017, 10:33 AM   #2776
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good deal!! second set of eyes is always a nice thing to have on a project like this.. however painting your bus blood-red likely wasnt in the plan!! ugh hope he recovers soon.. cant wait to see how you get this mechanically actuated.. of course one thought i had would get me tossed across the room.. which is.. "why didnt you just use Air brakes?"..
-Christopher
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Old 11-11-2017, 12:24 PM   #2777
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A better question might be...

"What the Hell was I thinking when I took on a 71 year old school bus?"
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Old 11-11-2017, 12:39 PM   #2778
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Quote:
Originally Posted by Tango View Post
A better question might be...

"What the Hell was I thinking when I took on a 71 year old school bus?"
probably the same thing as any of us who take on a 1940 something anything.. "how cool this is gonna be!.. and it cant be that hard to slap a big engine in, some A/C, a tilt steering column and yeah lets go!.. said many a Hot-rodder who gave up before the wheels ever turned under their own power..

then again when you are out camped next to Ol trunt stealing the eyes of the whole campground.. the booze flowin and the sun is setting it will a be all worth it!!
-Christopher
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Old 11-11-2017, 12:56 PM   #2779
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Let's hope so Christopher.

I pretty much knew what I was in for when I fell in love with this gal. I also knew that very few things in this world get you into more trouble than "love".
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Old 11-11-2017, 01:06 PM   #2780
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the world of resto-modding makesi t even harder.. when you restore a car back to original, you at least have a good idea of what the parts are supposed to be.. even if you have a tough time finding them.. you know that part A was supposed to go in hole B..

when resto-modding you first have to determine that you need a part A.. and what part A is gonna look like.. then you have to figure out how to make part A.. and then you find out that you cant drill hole B because bracket C is already where hole B is supposed to be... Ok.. back to 'I think I need a part A.."
-Christopher
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