| High disk brake temperature on right mid-axle [message #265968] |
Thu, 13 November 2014 09:28  |
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batman
Messages: 100
Registered: January 2004
Location: Benbrook, TX
Karma: -3
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My coach was converted to 6 wheel disk brakes.
Was driving the GMC in Arkansas this past weekend down the road from the top of Magazine mountain. Was in 2nd gear to help keep speed in check and was trying to use the brakes sparingly, but I noticed a "bad" noise coming from the rear brakes. Pulled over and checked the temperature on all the rear disks. The right mid-axle temperature (over 700 degrees) was twice that of the left mid-axle, the rear axle disks were much cooler. What would cause one disk to get so much hotter than the others?
eugene
benbrook, tx
77 Eleganza II, Howell EFI + EBL
http://gmc.backyardwildlife.com
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| Re: [GMCnet] High disk brake temperature on right mid-axle [message #265969 is a reply to message #265968] |
Thu, 13 November 2014 09:38  |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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A hung up or dragging caliper. I never saw temps above 375 ( iirc)on my mid bogeys even after coming down the mountain from the Cutises. I have six wheel disc
Todd Sullivan
Sully
77 royale
Seattle
> On Nov 13, 2014, at 7:28 AM, eugene wrote:
>
> My coach was converted to 6 wheel disk brakes.
>
> Was driving the GMC in Arkansas this past weekend down the road from the top of Magazine mountain. Was in 2nd gear to help keep speed in check and
> was trying to use the brakes sparingly, but I noticed a "bad" noise coming from the rear brakes. Pulled over and checked the temperature on all the
> rear disks. The right mid-axle temperature (over 700 degrees) was twice that of the left mid-axle, the rear axle disks were much cooler. What would
> cause one disk to get so much hotter than the others?
>
> --
> eugene
> benbrook, tx
> 77 Eleganza II, Howell EFI + EBL
> http://gmc.backyardwildlife.com
> _______________________________________________
> GMCnet mailing list
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: High disk brake temperature on right mid-axle [message #265972 is a reply to message #265968] |
Thu, 13 November 2014 09:42 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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batman wrote on Thu, 13 November 2014 08:28My coach was converted to 6 wheel disk brakes.
Was driving the GMC in Arkansas this past weekend down the road from the top of Magazine mountain. Was in 2nd gear to help keep speed in check and was trying to use the brakes sparingly, but I noticed a "bad" noise coming from the rear brakes. Pulled over and checked the temperature on all the rear disks. The right mid-axle temperature (over 700 degrees) was twice that of the left mid-axle, the rear axle disks were much cooler. What would cause one disk to get so much hotter than the others?
Assuming that your brake pads are not completely worn out and you do not have metal to metal contact, the most likely cause of the high temps would be a hung up caliper that is not releasing all the way and is causing the brake to drag. This could be caused by gunk or corrosion in the caliper it's self, or a bad brake hose acting like a check valve.
The other possibility would be a bad wheel bearing. If the wheel bearing is worn to the point that it is making noise, the undue friction would cause the hub to heat up excessively. Either way, I would recommend that you pull that hub off and check the bearing. All that heat may have cooked the grease out of that bearing.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] High disk brake temperature on right mid-axle [message #265974 is a reply to message #265972] |
Thu, 13 November 2014 09:48 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Check the wheel bearing adjustment.
If ok, turn the wheel by hand to check for tight or misaligned caliper or
stuck piston, or swelled brake hose.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Nov 13, 2014 7:42 AM, "Carl Stouffer" wrote:
> batman wrote on Thu, 13 November 2014 08:28
>> My coach was converted to 6 wheel disk brakes.
>>
>> Was driving the GMC in Arkansas this past weekend down the road from the
> top of Magazine mountain. Was in 2nd gear to help keep speed in check
>> and was trying to use the brakes sparingly, but I noticed a "bad" noise
> coming from the rear brakes. Pulled over and checked the temperature on all
>> the rear disks. The right mid-axle temperature (over 700 degrees) was
> twice that of the left mid-axle, the rear axle disks were much cooler. What
>> would cause one disk to get so much hotter than the others?
>
>
> Assuming that your brake pads are not completely worn out and you do not
> have metal to metal contact, the most likely cause of the high temps would
> be
> a hung up caliper that is not releasing all the way and is causing the
> brake to drag. This could be caused by gunk or corrosion in the caliper
> it's
> self, or a bad brake hose acting like a check valve.
>
> The other possibility would be a bad wheel bearing. If the wheel bearing
> is worn to the point that it is making noise, the undue friction would cause
> the hub to heat up excessively. Either way, I would recommend that you
> pull that hub off and check the bearing. All that heat may have cooked the
> grease out of that bearing.
>
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] High disk brake temperature on right mid-axle [message #266008 is a reply to message #265968] |
Thu, 13 November 2014 15:29 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G'day,
Unfortunately you have not provided enough information to troubleshoot this problem fully please advise:
1) When was the coach converted to 6 wheel disks?
2) What kind of calipers were used on:
a) Front wheels
b) Middle wheels
c) Rear wheels
Comment: Below are links to photos of the different types of calipers that can be used:
http://www.tsmmfg.com/3100.html
http://www.tsmmfg.com/3110.html
http://www.tsmmfg.com/3020.html
http://www.tsmmfg.com/3010.html
http://www.tsmmfg.com/3120.html
http://www.tsmmfg.com/3121.html
I can't seem to find a photo of the OEM caliper.
3) Do the calipers used on the middle / rear wheels have brake cables connected to them?
4) Was the combination valve replaced with one designed for all disk brakes?
Comment: I realize that the combination valve will not affect the operation of a single brake caliper.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: eugene
My coach was converted to 6 wheel disk brakes.
Was driving the GMC in Arkansas this past weekend down the road from the top of Magazine mountain. Was in 2nd gear to help keep
speed in check and was trying to use the brakes sparingly, but I noticed a "bad" noise coming from the rear brakes. Pulled over and
checked the temperature on all the rear disks. The right mid-axle temperature (over 700 degrees) was twice that of the left
mid-axle, the rear axle disks were much cooler. What would cause one disk to get so much hotter than the others?
--
eugene
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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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