| Re: [GMCnet] Brake temps with infrared scope [message #314282] |
Wed, 08 March 2017 11:31  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Your coach, just sitting still in the Texas sun, could reach 100° over
ambient outside temperatures. So, sitting still on a 90° day, tires and
wheel Temps could easily be 190°, before any heat gain from braking and
rolling forces. I would say that 200 - 225° might be considered "normal" on
the sunny side of your coach in Texas. In Oregon, on a rainy, cloudy 60°
day, that might be a bit high, and would require looking at more
frequently. So, when I say "it depends", that is the basis for my comment.
Certainly, any Temps measured at the rotors or drums in excess of 260° in
use should be an indication of excessive heating. You will see this temp,
but not just rolling along in flat country and not stop and go. Descending
the Rockies, or Cascades, heavy braking, you will see over 300° for short
periods. Kinda makes your butt pucker, don't it?
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Mar 8, 2017 9:03 AM, "Scott Nutter" wrote:
I am going to start documenting all my brake temps with the infrared gun
now that everything is new there.
Previously I would judge temps by feeling the heat with my hand on the rims.
Where would be the exact correct place on the rims or drums to get the most
correct temp values?
And roughly, what should those values be? It is a stock brake system with
80mm calipers up front.
Thanks, Scott
--
Scott Nutter
1978 455 Royale Center Kitchen, Quad bags.
Houston, Texas
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| Re: [GMCnet] Brake temps with infrared scope [message #314293 is a reply to message #314282] |
Wed, 08 March 2017 18:21  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Lemme suggest a couple things. It's going to be more important to measure in the same place each time than what reading you get. Also, a differential on the same axle is suspect. there shouldn't be much side to side difference. Also, if you just braked to a sop, the measurement will reflect that. If you're looking for hot bearings, dragging brakes etc, coast to a stop and then measure. A log should point out any problems via changes in the 'normal' readings. I measure the back drums through a hole in the road wheel, and the surface of the front disc through one/
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Brake temps with infrared scope [message #314294 is a reply to message #314282] |
Wed, 08 March 2017 18:23 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Quote:On Mar 8, 2017 9:03 AM, "Scott Nutter" wrote:
I am going to start documenting all my brake temps with the infrared gun
now that everything is new there.
Previously I would judge temps by feeling the heat with my hand on the rims.
Where would be the exact correct place on the rims or drums to get the most
correct temp values?
And roughly, what should those values be? It is a stock brake system with
80mm calipers up front.
Thanks, Scott
--
Scott Nutter
1978 455 Royale Center Kitchen, Quad bags.
Houston, Texas
Scott,
Without knowing what wheels you have, there are two different temperatures per wheel. Try to read the hub and the outer brake drum or rotor on each wheel. The bearing temperatures should all normally max at about 150°F. The drums and rotors are very load dependent. If you have reaction arms, all four of the rear should be the same. If you don't the intermediate will always be higher than the rear and the front is always high if you stop was hard at all.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Brake temps with infrared scope [message #314302 is a reply to message #314282] |
Thu, 09 March 2017 00:45 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Scott. Your in mostly in flat areas like I am in Iowa. I use my infrared to check my axle temps at every gas stop during my walk around check. Also check dolly/trailer. I point it at one of my Eagle rim lug nuts. As they have no covers. Or just anything that's in good contact with the hub. I don't check the rotors, or drums. Those temp very greatly. If the brake are hot. The hub temps will reflect the drums/rotors. Just averaged out. As to temp readings. Over the years. My hub temps run around 7 degrees above ambient temps. On very long straight drives. The Sun shine side will run around 2 degrees higher.
Bob Dunahugh 78 Royale
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