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Rear Brake thickness specs
Crawled under recently and looked at thickness of brakes shoes on drive brakes, they looked real thick easy to see, is their a thickness spec for needing to be replaced?
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4 Replies
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Art
Not sure if this is of any help, i have just replaced rear seals, brake linings and Brake actuators on my 95 Marathon, my brakes are Rockwell / Meritor
They say that minimum lining thickness is 1/4 inch, and also give a minimum lining height above the retaining bolts, which is what we are really interested in,
i think that is approx 1/16, but at that they are really worn out, if you look at the outer edge of the new linings you will see a recessed line, that is the wear line, its on both edges of the shoe.
To measure depth above retaining bolts you will need drum off, i replaced mine as one side was worn more than the other but still serviceable, but to replace linings you have to first remove hubs, so as i had them off to fit new seals i thought it best to replace all and i can now forget that work for a few miles.
The shoes generally wear down more in the centre contact area, they are fairly cheap at $250 Canadian for all 8 linings.
Regards
Gordon
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL -
Thanks Gordon
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I was somewhat surprised to see the use of steel nuts and flat head bolts to hold the friction material to the shoe.
To prevent damage to drums brass fasteners should be used because if the friction material is worn down or cracks and separates the fastener will be sacrificed and the drums will not get gouged.
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not a very clear picture of the retaining bolts but they are infact Brass taper headed countersink bolts with steel nuts, the washer is part of the nuts, all supplied by Rockwell parts supplier with the new friction shoes.
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