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12-08-2013, 06:52 PM
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#1 |
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Registered User
Join Date: Sep 2011
Location: NW Arkansas
Posts: 291
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Replacement air brake knobs?
My brother has a 1985 GMC 6000 with air brakes. The air brake knobs are in poor shape and I was thinking about replacing them for Christmas. Are the replacement knobs universal? I can find lots of replacement knobs but I'm not sure if they will work on his air valves. The air valves and knobs have a logo with a "BW" inside of a diamond. I think that is the Bendix corporation. Will all of the pin style knobs work?
Also, any idea where I could find a replacement knob for the two speed rear end? Thanks guys!
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1982 GMC Crew Cab 4x4 - "River Truck" build thread 1973-1987(91) Chevy/GMC How-To Videos |
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12-08-2013, 07:18 PM
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#2 |
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#16876
Join Date: Apr 2005
Location: Auburn WA
Posts: 12,266
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Re: Replacement air brake knobs?
I've never seen more than one size or type of modern style knobs.
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Posted via Stationary Device '71 Custom Deluxe C-20 402. '67 Buick Special 455. '49 Plymouth Special Deluxe. "I love that old car smell"  Some people are like Slinkies... not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs. |
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12-08-2013, 07:39 PM
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#3 |
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Kid's Mechanic
Join Date: Nov 2006
Location: Kansas City
Posts: 8,241
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Re: Replacement air brake knobs?
The air brake knobs can come from any big truck parts place or dealer for that matter . The two speed switch will more than likely require the switch swapped out as I have never seen one with a replaceable knob yet .
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12-08-2013, 08:09 PM
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#4 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,278
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Re: Replacement air brake knobs?
Those have a roll pin.
Any truck parts supply should have them. http://www.tabsupply.com/#!about/cn5x
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" That didnt make it any newer " " Dont antique the equipment " Last edited by KQQL IT; 12-08-2013 at 08:15 PM. |
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12-08-2013, 10:28 PM
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#5 |
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Registered User
Join Date: Sep 2011
Location: NW Arkansas
Posts: 291
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Re: Replacement air brake knobs?
Thank you guys! I appreciate the help!
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1982 GMC Crew Cab 4x4 - "River Truck" build thread 1973-1987(91) Chevy/GMC How-To Videos |
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12-31-2013, 04:53 PM
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#6 |
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Registered User
Join Date: Sep 2011
Location: NW Arkansas
Posts: 291
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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?
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1982 GMC Crew Cab 4x4 - "River Truck" build thread 1973-1987(91) Chevy/GMC How-To Videos |
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