Home » Public Forums » GMCnet » Brake Drum Temps
| Brake Drum Temps [message #283948] |
Tue, 04 August 2015 15:26  |
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thainglo
Messages: 132
Registered: March 2015
Location: Iowa
Karma: 2
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After doing a complete rear brake job with new shoes and hardware, plus fluid flush, and an 80mm caliper upgrade for the front with PFC carbon metallic pads, I finally got to go out this afternoon and bed in the brake pads. Did several stops, with light pressure, medium pressure, and hard pressure, from 50 to 30 (light) and 65-35 on medium and heavy. Followed with a cool down period, basically getting back to the house with as little brake usage as possible.
After pulling in the driveway, I used my IR thermometer to check the drum temps. Wondering if I have cause for concern...
Passenger Front: 140
Passenger Rear: 160
Driver Front: 250
Driver Rear: 170
The DF seems like a real outlier. Or am I making more of this than I should?
I cleaned and replaced the four rear bearings when everything was apart.
Thoughts?
Matt Sladek
1976 Eleganza II
Coralville, IA
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| Re: Brake Drum Temps [message #283953 is a reply to message #283948] |
Tue, 04 August 2015 16:20  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Thought: Something ain't right in the driver front. 80MM calipers = new hoses, so likely not a collapsed hose. Either a pad dragging, or a problem with the bearings in that hub. run it dopwn the highway and coast to a stop. Shoot both discs and both knuckles and see what you get. Answer you need is, is the disc getting it hotter, or are the front bearings getting it hotter.
--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
[Updated on: Tue, 04 August 2015 16:20] Report message to a moderator |
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| Re: Brake Drum Temps [message #283957 is a reply to message #283948] |
Tue, 04 August 2015 16:37 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Yeh, it may be dragging. Are ya >sure< the new wheel cylinder was the same diameter as the old one? here are two sizes, if you have differences side to side, you'll have different braking side to side, and consequently different temops side to side. However, since it's the four rears, easy check. find a clear road, boogie down it at highway speeds for a few minutes. Coast to a stop w/out touching the brakes. Remeasure. if it's hotter than the others, it's dragging. If it's the same, time to check the new cylinder diameter. If it's dragging, check emergency brake cables and adjustment.
--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 Drum Temps [message #283959 is a reply to message #283948] |
Tue, 04 August 2015 16:34 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I think Driver Front is Left Middle, so it's a drum problem, not the new 80
mm caliper. Very likely not properly adjusted, or the parking brake cable
is sticking. So darned many mickey-mouse parts in any drum system that it
may require pulling the drum to be sure they're all in place correctly.
Ken H.
On Tue, Aug 4, 2015 at 4:26 PM, Matt Sladek wrote:
> After doing a complete rear brake job with new shoes and hardware, plus
> fluid flush, and an 80mm caliper upgrade for the front with PFC carbon
> metallic pads, I finally got to go out this afternoon and bed in the brake
> pads. Did several stops, with light pressure, medium pressure, and hard
> pressure, from 50 to 30 (light) and 65-35 on medium and heavy. Followed
> with a cool down period, basically getting back to the house with as little
> brake usage as possible.
>
> After pulling in the driveway, I used my IR thermometer to check the drum
> temps. Wondering if I have cause for concern...
>
> Passenger Front: 140
> Passenger Rear: 160
> Driver Front: 250
> Driver Rear: 170
>
> The DF seems like a real outlier. Or am I making more of this than I
> should?
>
> I cleaned and replaced the four rear bearings when everything was apart.
>
> Thoughts?
> --
> Matt Sladek
> 1976 Eleganza II
> Coralville, IA
>
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> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Brake Drum Temps [message #283964 is a reply to message #283948] |
Tue, 04 August 2015 17:13 |
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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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Matt,
You did target the drum though a wheel opening - right??
I usually measure the disk/drum and hub temperatures in all 12 places.
In the rear, there is usually a variation front to rear, but never that big.
Were I you, I would try to chase that one down. 110° is more than I would expect.
Matt
thainglo wrote on Tue, 04 August 2015 16:26After doing a complete rear brake job with new shoes and hardware, plus fluid flush, and an 80mm caliper upgrade for the front with PFC carbon metallic pads, I finally got to go out this afternoon and bed in the brake pads. Did several stops, with light pressure, medium pressure, and hard pressure, from 50 to 30 (light) and 65-35 on medium and heavy. Followed with a cool down period, basically getting back to the house with as little brake usage as possible.
After pulling in the driveway, I used my IR thermometer to check the drum temps. Wondering if I have cause for concern...
Passenger Front: 140
Passenger Rear: 160
Driver Front: 250
Driver Rear: 170
The DF seems like a real outlier. Or am I making more of this than I should?
I cleaned and replaced the four rear bearings when everything was apart.
Thoughts?
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: Brake Drum Temps [message #283969 is a reply to message #283948] |
Tue, 04 August 2015 17:30 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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thainglo wrote on Tue, 04 August 2015 14:26After doing a complete rear brake job with new shoes and hardware, plus fluid flush, and an 80mm caliper upgrade for the front with PFC carbon metallic pads, I finally got to go out this afternoon and bed in the brake pads. Did several stops, with light pressure, medium pressure, and hard pressure, from 50 to 30 (light) and 65-35 on medium and heavy. Followed with a cool down period, basically getting back to the house with as little brake usage as possible.
After pulling in the driveway, I used my IR thermometer to check the drum temps. Wondering if I have cause for concern...
Passenger Front: 140
Passenger Rear: 160
Driver Front: 250
Driver Rear: 170
The DF seems like a real outlier. Or am I making more of this than I should?
I cleaned and replaced the four rear bearings when everything was apart.
Thoughts?
All those temps are pretty low so it may indicate a tight adjustment that should equalize after you get some miles on the set up. If you stay under 500 on any of the drums, you should be fine.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Brake Drum Temps [message #283986 is a reply to message #283948] |
Tue, 04 August 2015 23:03 |
mrgmc3
Messages: 210
Registered: September 2013
Location: W Washington
Karma: 2
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Senior Member |
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Add this to the FWIW file; I just checked all four drums with an iR thermometer on Saturday. It was an 80F day and I checked after 75 miles of 60 mph freeway driving. I have 16.5 steel wheels and shot the drum surface through the wheel holes. All four were 125F +- 5.
Chris Geils - Twin Cities / W Wa
1978 26' Kingsley w/ very few mods; PD9040, aux trans cooler, one repaint in stock colors, R134a, Al rad, Alcoas, 54k mi
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