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Old 07-12-2018, 08:13 AM   #15
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Needs a clean-up and repost.
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Old 07-12-2018, 09:47 AM   #16
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Quote:
Originally Posted by speed racer View Post
Not knowing the year it has drum brakes on the steering axle and the backing plate is missing.
There is NO backing plate on air braked equipped coaches/trucks.
Scott
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Old 07-12-2018, 01:23 PM   #17
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There is NO backing plate on air braked equipped coaches/trucks.
Scott
Can't say about a coach, but some trucks have them. I did enough off-road work that if they where there I would remove the bottom half. They do not seal everything out, and I wanted anything that did not belong inside to have a easy path out.
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Old 07-12-2018, 02:51 PM   #18
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After the postings of the more experienced people I'm inclined to go with no crack but would really need to touch the coach to be sure.

Moving a bit away from the topic but staying with the OP's image, and for my own education, is that brake shoe hanging outside the edge of the top half of the drum assembly (outlines in red)? My drum brake experience is limited to light vehicles with hydraulic brakes and always with a backing plate so in my mind that's not even possible.
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Old 07-12-2018, 03:09 PM   #19
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After the postings of the more experienced people I'm inclined to go with no crack but would really need to touch the coach to be sure.

Moving a bit away from the topic but staying with the OP's image, and for my own education, is that brake shoe hanging outside the edge of the top half of the drum assembly (outlines in red)? My drum brake experience is limited to light vehicles with hydraulic brakes and always with a backing plate so in my mind that's not even possible.

No Sir, that brake shoe is exactly where it's supposed to be. You are right in the fact that on much lighter braking systems, i.e. cars and pickups etc. the brake backing is what retained the brake shoes. I thought it kind-a funny too when I was first hired on the FD waaaaay back in '80 and, I was witnessing a brake job on one of our fire trucks. It had no brake backings either. And all the fire trucks I was on for the next 30 years didn't have any either.

But, in these coaches, and air brakes especially, there is no backing plates. There are specific brackets that you cannot see here, that are retaining those shoes. And those brackets are seriously strong. They're not about to let those brake shoes "wander" any place they're not supposed to be.

I too would like to see the OPs picture retaken at a much closer zoom in. From the original pictures, it sure looks like a crack. But, as time, and this post, rambled on, it became a bit clearer that the "crack" was not a crack at all. Pretty deceiving the old grime is.
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Old 07-12-2018, 04:02 PM   #20
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There is NO backing plate on air braked equipped coaches/trucks.
Scott
Plenty of trucks have front backing plates. We were always bending them to get the stone to fall out, so they stop squeeling.

Often while removing the plates, the bolts snapped, and we just tossed them.
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Old 07-12-2018, 05:19 PM   #21
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Plenty of trucks have front backing plates. We were always bending them to get the stone to fall out, so they stop squeeling.

Often while removing the plates, the bolts snapped, and we just tossed them.
Squealing stones pinched between the drum and dust shield just got a smack with a 2 pound hammer. Turned them to a bit of dust that would fall out.

Still waiting for a reply from the OP and maybe another picture.
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Old 07-12-2018, 05:27 PM   #22
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I stand corrected as to my grease being string of some sort. As to the crack, unless I could see bare metal, I would consider it as a crack and get it professionally and in person.
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Old 07-12-2018, 05:45 PM   #23
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No Sir, that brake shoe is exactly where it's supposed to be.
Thanks.
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Old 07-12-2018, 09:19 PM   #24
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if you zoom in at the bottom where the rod connects you can see the crack
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Old 07-12-2018, 09:22 PM   #25
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It is in getting a generator leak fixed, tomorrow I will go clean it and get a better look/pix
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Old 07-12-2018, 10:14 PM   #26
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Plenty of trucks have front backing plates. We were always bending them to get the stone to fall out, so they stop squeeling.

Often while removing the plates, the bolts snapped, and we just tossed them.
Roger that, sorry for the incorrect info. Just never seen any on any of our fire trucks and or air braked coaches I've worked on. Thanks.
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Old 07-13-2018, 06:51 AM   #27
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I made my Living for more than 40 years as a mechanic and most all trucks driven over the road had backing plates I agree that the fire equipment and almost all of the equipment that we had that wasn't driven on the roads didn't have backing plates but they are there to keep snow and road debris out of the drum.
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Old 07-13-2018, 09:09 AM   #28
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In some cases backing plates are an option when ordering a chassis. i agree they are a good idea to keep out unwanted debree, snow and ice.
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