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What is this? What’s it for?
If you know what this is … please hold off responding for a while.
Let’s see what the guesses are.
Do you have one in your coach?
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13 Replies
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I think that is the rose petal dispenser adjustment tool. It’s used to adjust the pedal flow to your preference.I have heard of but never seen one until now.
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That is the T bolt used to cage an emergency brake chamber, or in other words, retract the spring to hold the brake “off”.
The Knorr Bremse brakes also have a means of caging them, but that is an integral bolt that is in the end of the brake chamber. The service brakes do not have to be caged.
Jeff and Lindsay
91 Marathon XL -
What Jon said is another one of the uses for the RPDAT.
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Sorry for being awnery. It stems from the stress that I encountered worrying that I had no red hoses on my engine until Jeff Rowe told me 8v92 didn’t need them.
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Jon … what era of coach should have one of these on hand?
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I thought that was used to hold Tom’s new slides in when the hand crank broke.
How’s that slide install going , Tom?
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Any coach except the ones with Knorr-Bremse chambers.
Note, the T bolt is sized per the chamber so what works on a 30-36 drive axle is not likely to work on a 16-24 tag axle chamber.
Look at the rear of the combination brake chambers (2 hoses going to them). If you see a hole in the center or a hole with a rubber plug it uses the T bolt, and the T bolt should be stored with the nut on the side of the brake chamber.
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They are stored in a hole on every bake chamber that has spring brakes. Mine has 4, 2 on the tag and 2 on the drive. I did a thread on this subject recently. See link below.
https://prevostcommunity.com/forum/threaddetails.asp?Category=Pneumatic&ThreadID=6484
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Andre, isn’t Teko calling you…..
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Despite these seemigly well informed answers, it still looks like a variable “thing-a-ma-jig” to me.
Someone fudged and looked it up….
Pres
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Pres, the old time gear heads on here will look upon that thingy as a life saver.
At one time our spring brakes could be rebuilt, but to disassemble them for purposes of replacing the diaphragm for example the spring had to be compressed. That T bolt was inserted into the back of the chamber and as the nut got tightened the spring would compress. If it was not correctly inserted and the T nut let loose from its slotted seat the spring would extend with enough force to kill someone.
You can imagine how much force our spring brakes have to be able to hold a coach from rolling such as on my 29% driveway grade, and how dangerous a spring could be if it was compressed and then suddently released. The spring brake on my first coach used a steel coil spring with a diameter of about 1/2″ thick steel rod.
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The T-Nut has been around forever.
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I knew a person who was killed when working on a defective brake chamber that had rusted. Even though he thought he had safely caged the brake by using the T-bolt, it let loose while removing the clamp that holds the chamber to the base and flew off with enough force it killed him by hitting him in the head.
If you have to use one of these, make sure you know what you are doing as it can kill you.
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