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Brake drum size


alan0043
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Hi Everyone,

How do I know what size brake drums that I have on the front of my truck without pulling off a front wheel ? I am looking at putting on Centramatic wheel balancers on the truck. The truck is a 2012 Volvo VNL630. The Centramatic application guide flow chart wants to know if the truck has 15" or 16.5" brake drums on the front.

Thank you for any help,
Al

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Agree with DesertMiner, dealer can give you the right info. As it depends on what axles. How the truck was ordered, and  that kind of stuff.

Seen 3 trucks same Make, years and all three had different drum's. One had a big Engine and heavy haul spec's, then one had a big engine set up as a Tri-Axle, third was fleet unit.

Also if your looking to do the brake job yourself. Check out Youtube, and watch the video on lifting the drum's with a dolly. No lifting and it does all the work for you.

 

Edited by Pete Kildow
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18 hours ago, Pete Kildow said:

Agree with DesertMiner, dealer can give you the right info. As it depends on what axles. How the truck was ordered, and  that kind of stuff.

Seen 3 trucks same Make, years and all three had different drum's. One had a big Engine and heavy haul spec's, then one had a big engine set up as a Tri-Axle, third was fleet unit.

Also if your looking to do the brake job yourself. Check out Youtube, and watch the video on lifting the drum's with a dolly. No lifting and it does all the work for you.

 

Hi Pete,

Thank you for posting the video. Work smarter not harder. That is something I need to remember.

Al

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23 hours ago, Scrap said:

They haven't put a 15" brake on a truck since 2011.  So you are probably pretty safe with a 16.5.  Eventually you look at enough of them you can tell by looking through the wheel holes!

Hi Scrap,

I was able to look thru the holes in the wheels and find this on the drum. 16.620 MAX. It sure looks like the truck has 16.5". I know I should check out the serial number.

Al

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On 1/26/2018 at 9:14 AM, alan0043 said:

Hi Scrap,

I was able to look thru the holes in the wheels and find this on the drum. 16.620 MAX. It sure looks like the truck has 16.5". I know I should check out the serial number.

Al

Hi Everyone,

Here is a little update. I stopped by the local Volvo dealer and had the serial number checked out. The brakes are 16.5" x 6". I asked the guys behind the parts counter which year the brakes changed but they don't remember which year the trucks had a change in brake size.

Al

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A 16.5x5 will bolt on and work.  A 16.5x6 true RSD (reduced stopping distance) truck setup won't work without a knuckle change.  They had to beef up the spider bolts and re-arrange the ABS sensor location.  That's with a E1200i axle though.  The unit bearing Meritors that some of you Volvo guys got I have no idea on.  The 8 bolt wheels some of you have I'm not sure if the valve stem would clear the large drum either - it would need to be checked out.  Quite a few 16.5x5's run type 30 chambers that would need a front brake plumbing change to remove the QR valve and install a relay valve as well.  I'm not sure I'd upfit a 4x2 without 40/60 or 50/50 range weight distribution either.  It could be a wild ride!

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