|
Re: Replacement air brake knobs?
I bought my brother the three replacement knobs for Christmas. Since it was a surprise, I wasn't able to do as much measuring/disassembly as I would have liked before ordering. After I gave them to him we tried to install them but only one fits... Turns out that all three air valve shafts are different sizes.
Red trailer air supply - .308" shaft diameter
Yellow parking brake - .371" shaft diameter
Blue Tractor Parking - .435" shaft diameter
The knobs that I bought all have 3/8" (.375") shaft hole diameter. So the Parking brake knob worked but the other two didn't. I believe that 3/8" is the only size that I saw for replacement knobs. Now I'm even more confused than before. Any ideas?
|