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Old 12-23-2014, 06:07 PM   #1
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Brakes got overheated

while getting towed last nite they over heated my brakes good my better judgement is saying to replace seals and shoes how much can they take ? and yes im after the towing company also
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Old 12-23-2014, 09:00 PM   #2
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Sounds like the tow truck operator forgot to hook-up the air line from wrecker to MH. That can get expensive, shoes, drums, bearings, seals, S-cam and linkage, etc.
You might get an evaluation/2nd opinion from a HDT repair shop(not only the towing company shop).
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Old 12-23-2014, 09:29 PM   #3
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They can take a lot more than you might imagine. That said, the tow company should do the right thing and have everything inspected.

Were they smokin' hot, as in red glow from the drums?
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Old 12-23-2014, 10:26 PM   #4
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Quote:
Originally Posted by Ray,IN View Post
Sounds like the tow truck operator forgot to hook-up the air line from wrecker to MH. That can get expensive, shoes, drums, bearings, seals, S-cam and linkage, etc.
You might get an evaluation/2nd opinion from a HDT repair shop(not only the towing company shop).
Ray i m not taking chances but what is a s cam ? the repair shop is a truck shop i had a broken fuel line what is a hdt repair shop ? thanks
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Old 12-23-2014, 10:28 PM   #5
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They can take a lot more than you might imagine. That said, the tow company should do the right thing and have everything inspected.

Were they smokin' hot, as in red glow from the drums?
they werent red that i could see but they sure were smokin
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Old 12-24-2014, 12:10 AM   #6
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fxdave,
An "S" cam is just that. It's shaped like an "S" and, it's on a shaft that rotates. Sitting against the "S" are the rollers that are in contact with your brake shoes. As the S rotates, (it rotates via a shaft from the air brake cans) the it moves the rollers and also, the brake shoes. They in tern, move out towards the brake drums. Now, all this movement, is quite slight. It doesn't take much rotation of the S cam to move the rollers which move the shoes.

That is of course, if your brakes are adjusted correctly. But, that's a whole 'nother novel. Anyway, hope this info helps some.
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Old 12-24-2014, 09:58 AM   #7
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fxdave, the "S" cam is the piece that applies pressure to both brake shoes when the brakes are applied, and pushes them against the drum. I'm not saying it is damaged, just needs inspection with the rest of the brake parts in that picture.
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Old 12-24-2014, 10:13 AM   #8
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Once upon a time I smoked the brakes on a rig (drums). When I pulled the drums the inside wear area had a lot of real fine lines in a honeycomb like pattern. Someone who knows more than me said that it was heat stress cracking. On a commercial vehicle they would have to be replaced. I ran them, with new shoes, for another 100,000+ miles. We don't come close to stressing the brakes or running gear the way a truck does.
Check the drums and do what feels good for you.
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Old 12-24-2014, 02:10 PM   #9
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Quote:
Originally Posted by Ray,IN View Post
Sounds like the tow truck operator forgot to hook-up the air line from wrecker to MH. That can get expensive, shoes, drums, bearings, seals, S-cam and linkage, etc.
You might get an evaluation/2nd opinion from a HDT repair shop(not only the towing company shop).

I'm not a mechanic but it sounds like Ray is right!
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Old 12-24-2014, 02:19 PM   #10
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I read yesterday of your fuel line failure, Bummer , I am surprised if your air was down , and the tow truck did not hookup and air your system up , that he even got it to roll......the maxie brakes would of been set, not allowing it to move at all.......60# or below, brakes on. Did he take your drive shaft out or the axles BEFORE TOWING IT? If not, I would direct my concerns to the Allison........$$$$$$ but not forget the braking system.
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Old 12-25-2014, 08:37 AM   #11
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Quote:
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I read yesterday of your fuel line failure, Bummer , I am surprised if your air was down , and the tow truck did not hookup and air your system up , that he even got it to roll......the maxie brakes would of been set, not allowing it to move at all.......60# or below, brakes on. Did he take your drive shaft out or the axles BEFORE TOWING IT? If not, I would direct my concerns to the Allison........$$$$$$ but not forget the braking system.
yes he disconnected the drive shaft
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Old 12-25-2014, 08:38 AM   #12
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yes he disconnected the drive shaft
Great to hear this part anyway........
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Old 12-25-2014, 08:43 AM   #13
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still never figured out why the brakes come on
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Old 12-25-2014, 08:48 AM   #14
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When the driver released the brakes......to tow it the air pressure was up enough to release the spring brakes.......You never mentioned if the driver ran a air line from the tow truck to the Coach, to air up the system while towing it? if not, when the air pressure dropped to approximately 6o# the rear brakes came on....... by a low air pressure condition, just as they are suppose to do.


http://www.gonefcon.com/trucktcom/b_chmbrs.htm


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