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Old 09-20-2016, 12:20 PM   #1
excelsiuss
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behotech brakes staying on


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I have a set of behotech struts/wheels/brakes on my sprint.

The brakes are coming on and staying on. This is not a radio or servo adjustment problem. The inner O ring is pushing like it supposed to when applied, but it is not returning all the way and the brakes stay on. When I pull on the tire I can feel a small click and then the wheel spins freely again. I see there are long 2mm grub screws.. What are they for?

Can someone please help and maybe even direct me to a service manual.

Thanks!
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Old 09-20-2016, 01:52 PM   #2
excelsiuss
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Re: behotech brakes staying on

From my examination thus far, I can see that the O ring is over extending itself and not returning to the neutral position. It is not your traditional o ring and it has a groove in the O ring reciever/mount. When I pull back on the tire the Click sound is the O ring returning to the groove.

Solution.. The bushing that keeps the wheel from rubbing on the O ring retainer was shortened by 1mm,(its about 1.2mm to long) so that now the o ring does not need to reach as far. There is part B of a problem as well. The air system is so good that the air cannot escape fast enough and thus keeps the O ring pressurized. I will need to instal a bleed off to quicken this. Its a single tank on a behotech valve.. so the brakes will only loose/use air when in the brake position. Call me crazy lol but for the time being I put a tiny hole in both brake lines close to the wheels. It seems to be working
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Old 09-20-2016, 10:27 PM   #3
Peter A
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Re: behotech brakes staying on

I do not know why you are re-designing something that is already an excellent design. There is nothing wrong with the Behotec brakes. There is a 5.5mm spacer needed between the brake and the wheel to keep the proper amount of spacing, it needs no lengthening or shortening. Also the brakes have two ways of keeping them in place, either a set screw to clamp the brake to the axle or leave them free to partially rotate and the worm screw stops them from spinning.
Also if your rubber o ring is sticking or over extending, it most likely needs to be replaced. Just like your car brakes, things do wear out in the hobby products.
No need to drill holes in lines, you just need to properly maintain them, keep them clean and replace bad parts as needed.
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Old 09-21-2016, 10:21 AM   #4
excelsiuss
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Re: behotech brakes staying on

Thanks for the reply Pete. But I needed them to be working NOW!(and now they do ) Time is not a luxury to me.

Thanks
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Old 09-29-2016, 10:57 AM   #5
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Re: behotech brakes staying on

Sounds like you possibly need to greese your brakes.

I've had problems like this before. And you just need to greese the heck out of the prints and drums.
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