Trucks & Trailers - Brake service...help with analysis of symptoms

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petrel
02-27-2011, 12:10 PM
The other three wheel, hub, brake assemblies looked ok. The last one had the following symptoms:

Loose Caliper bolt
Loose caliper bracket-literally just hanging by the bolts
Tire abnormally worn on the inside edge.
Loose castle nut
Grease just beginning to escape from rear seal.

I am in the process of completely overhauling it all, but what could have caused such near self destruction?!


makonnen
02-27-2011, 11:24 PM
The other three wheel, hub, brake assemblies looked ok. The last one had the following symptoms:

Loose Caliper bolt
Loose caliper bracket-literally just hanging by the bolts
Tire abnormally worn on the inside edge.
Loose castle nut
Grease just beginning to escape from rear seal.

I am in the process of completely overhauling it all, but what could have caused such near self destruction?!

Pictures please.

The loose castelated nut would cause all of the rest of the symptoms. A lot of things can cause that nut to come loose ... someone tried to re-use the lock washer one too many times, someone replaced the hub races but they were not pushed in properly, damaged threads in the spindle, forgot the cotter pin, cotter pin too small or sheared, nut tightend too much causing bearings to heat up and wear abnormally fast.

You're going t o have to take a real close look at the spindle assembly and caliper mounts on the axle to determine if its usable. Axles are cheap, I'd replace it ... buying the axle will be the easy part ... taking it out with the rusty bolts will be the hard part.

Also trying to disconnect the old brake lines will not be fun. Chances are you'll wreck them and need to run new brake lines unless someone was really nice and used SS lines.

petrel
02-28-2011, 06:59 AM
The caliper bracket seemed to line back up. There were raised tabs on the face of the bracket that must be there to align it. I torqued the bracket mounting bolts to 35ftlbs and put a drop of blue locktight on the back of them so I can see if they move.

I put all new bearings and races in, along with the seal. I could not see any damage or abnormal wear. This setup uses a tabbed washer, instead of a cotter pin. I am not fond of that arrangement because that washer allows the nut to back off just a bit, but everything seemed to go together very snug.

There was a stuck caliper slide. I freed that up, lubed it, and replaced the pads. I'll be pulling the wheel/tire off later in the week to have the tire replaced. I'll try to get a photo then.

BTW, this is a 7000lb torsion axle, with all stainless steel hardware and flexible brake lines with brass fittings. I hope the axle isn't the culprit.

Thanks for your help!




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