Home » Public Forums » GMCnet » IR thermometer (what temp)
| IR thermometer [message #279962] |
Mon, 15 June 2015 17:18  |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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what temps are the "oh crap" range?
I did my rear brakes, and I am going to start checking the brake temps. right now, I know they have a potential of being adjusted a little tighter, so i would expect some heat until they settle in.
what is normal/abnormal and at what temp should I be concerned?
this might have been discussed, but after some quick searching I have not found anybody tossing out numbers.
information on other areas suggested to keep an eye on, and what temps to expect.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: IR thermometer [message #279965 is a reply to message #279962] |
Mon, 15 June 2015 17:36  |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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Suggest using it to hit hub centers for bearing issues. This would hae saved me a hub.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: IR thermometer [message #279967 is a reply to message #279962] |
Mon, 15 June 2015 18:13 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Jon,
I have been chasing this quite a while. The only thing I can tell you is that if one brake is hotter than the others, look into it. One of the first times I did this check, I had just pulled into a rest area and WOW all the brakes were HOT.....
Of course you fool, you just stopped a 9500# coach.....
Now, when I remember, I check the bearings and brakes and they usually seem to agree and that is fine with me.
I've seen both drums and disks at 200° plus, (after crossing the Bighorn), but the bearings were maxed at 150°F and that was fine with me. If a bearing got up over 250°, I would worry because even Synpro is going to start running around.
Matt
lqqkatjon wrote on Mon, 15 June 2015 18:18what temps are the "oh crap" range?
I did my rear brakes, and I am going to start checking the brake temps. right now, I know they have a potential of being adjusted a little tighter, so i would expect some heat until they settle in.
what is normal/abnormal and at what temp should I be concerned?
this might have been discussed, but after some quick searching I have not found anybody tossing out numbers.
information on other areas suggested to keep an eye on, and what temps to expect.
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: IR thermometer [message #279968 is a reply to message #279962] |
Mon, 15 June 2015 18:23 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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The best thing to do is a comparison between wheels. If one is warmer then the rest, take a look at it. I use to carry an IR thermometer but instead I just use my hand. I usually stop and check in a rest area after several hours of traveling. I coast into the rest area using the least amount of brakes as possible. Then I check on a walk around comparing the 4 rears and the front two separately. It is not unusual to find all of the wheels on the sunny side of the coach slightly warmer than the shady side.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: IR thermometer [message #279973 is a reply to message #279962] |
Mon, 15 June 2015 21:48 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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If one rear brake is a lot hotter then the others I would suspect it is adjusted too tight, the emergency cable is sticking or the return spring is weak.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: IR thermometer [message #279977 is a reply to message #279962] |
Tue, 16 June 2015 00:13 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Last time I did this check it was 68 degrees ambient, coasted to a stop after a short highway run, and the fronts were 123 degrees and the rears were 95-100.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] IR thermometer [message #279996 is a reply to message #279962] |
Tue, 16 June 2015 07:16 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Jon,
I reckon if all four of the rear brakes are around the same temperature you're OK if one is way hotter than the other you got a
problem.
Regards,
Rob M.
The Pedantic Mechanic
-----Original Message-----
From: Jon Roche
what temps are the "oh crap" range?
I did my rear brakes, and I am going to start checking the brake temps. right now, I know they have a potential of being adjusted
a little tighter, so i would expect some heat until they settle in.
what is normal/abnormal and at what temp should I be concerned?
this might have been discussed, but after some quick searching I have not found anybody tossing out numbers.
information on other areas suggested to keep an eye on, and what temps to expect.
Jon Roche
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: IR thermometer [message #280007 is a reply to message #279962] |
Tue, 16 June 2015 08:58 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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lqqkatjon wrote on Mon, 15 June 2015 17:18what temps are the "oh crap" range?
I did my rear brakes, and I am going to start checking the brake temps. right now, I know they have a potential of being adjusted a little tighter, so i would expect some heat until they settle in.
what is normal/abnormal and at what temp should I be concerned?
this might have been discussed, but after some quick searching I have not found anybody tossing out numbers.
information on other areas suggested to keep an eye on, and what temps to expect.
Check them often and under different conditions. You will learn what is "normal" for your conditions. As stated, it is more so about comparing temperatures on similar positions.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] IR thermometer [message #280011 is a reply to message #280007] |
Tue, 16 June 2015 09:40 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Good " rule of thumb" here is around 100 degrees over ambient temperature.
+ or - 40° or so. Also very dependent upon how much you have been using
your brakes in the last few minutes. The alloy wheels carry away heat much
better than steel wheels do, so take that into account too. Worry about
heats over 275°. Check those out sooner rather than later.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Jun 16, 2015 6:58 AM, "Steve Southworth" wrote:
> lqqkatjon wrote on Mon, 15 June 2015 17:18
>> what temps are the "oh crap" range?
>>
>> I did my rear brakes, and I am going to start checking the brake
> temps. right now, I know they have a potential of being adjusted a little
>> tighter, so i would expect some heat until they settle in.
>>
>> what is normal/abnormal and at what temp should I be concerned?
>>
>> this might have been discussed, but after some quick searching I have
> not found anybody tossing out numbers.
>>
>> information on other areas suggested to keep an eye on, and what temps
> to expect.
>
>
> Check them often and under different conditions. You will learn what is
> "normal" for your conditions. As stated, it is more so about comparing
> temperatures on similar positions.
>
> --
> Steve Southworth
> 1974 Glacier TZE064V100150 (for workin on)
> 1975 Transmode TZE365V100394 (parts & spares)
> Palmyra WI
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: IR thermometer [message #280029 is a reply to message #279962] |
Tue, 16 June 2015 14:28 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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Thank you.
prior to brake repair, I had less then 200 on a couple rears, and about 100 on the others. I knew some were not working well, if at all because of the broken bleeder, and I knew there was air. Some had a bunch of brake fluid lubrication in the drums too.
after fixing up brakes, I have seen 180-240. yesterday I noticed one side was less then the other. This was in town driving, brakes adjusted to a slight drag.
obviously, every situation is different, but at least I now know I have some baseline, and have a general idea on when to investigate further.
will be keeping an eye on them, more for curiosity, as they wear in.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] IR thermometer [message #280032 is a reply to message #280030] |
Tue, 16 June 2015 15:42 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Rear drum brakes in good repair, "WITH OPERATING PARKING BRAKES", when
properly adjusted and cold, should have a slight dragging noise. When DRUM
BRAKES are at operating temperature, the drums expand and drag less.
When you have repaired the drum brakes and all is right with them, the
correct initial adjustment upon reassembly is as follows.
1. Using the appropriate brake adjusting tool, turn the starwheel
adjustment until you cannot turn it further easily.
2. Then reach through the adjustment slot with a sharp punch and press
against the self adjuster pawl until it is clear of the starwheel, then
back off the starwheel 5 clicks and try to turn the drum. If you can't,
back off 5 more clicks. Continue until a light even drag is felt.
3. Repeat this procedure on all 4 wheels.
4. Start engine, and press hard on the brake pedal several times.
5. Check the drag on all 4 drums. They should all have the same drag.
6. Road test the coach, go easy at first, then gradually increase braking
effort.
7. Shoot all drums with an IR thermometer. They should be within 50° or so
of each other.
8. If all is well, then, and only then, adjust your parking brake cables.
This process will insure that your brake shoes are centered in your drums.
This procedure is what I have successfully used repeatedly for many years.
It works well.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Jun 16, 2015 12:50 PM, "A." wrote:
> lqqkatjon wrote on Tue, 16 June 2015 14:28
>> ...brakes adjusted to a slight drag. ...
> They are too tight. Read here:
>
>
> http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=209319&rid=2083&srch=adjusted+balanced+rear+brakes#msg_209319
> --
> '73 23' Sequoia For Sale
> '73 23' CanyonLands For Sale
> Upper Alabama
> After all is said and done, a helluva lot more is said than done.
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