Hello,
Could anyone please provide some input on the expected wear of rear drum shoe lining. The attached image shows the wear on my 2015 4x2 crew cab low 138,000. This seem abnormal wear. By the workshop manual I believe the tolerances of a standard lining of 5.0mm(new) with a limit of 1.0mm before replacement (would replace at 2.0mm) although I expected uniform wear.
Any suggestions on what if anything should be done, and is this normal or a malfunctioning cylinder? Thanks
Dmax Brake Lining Wear
Re: Dmax Brake Lining Wear
apricot.
The wheel cylinder has nothing much to do apart from actuate the brake shoe, so it isn't the problem. Fairly normal wear as the cylinder applies the shoe but because of rotation and friction it is forced downward and tends to wedge the lower end. Therefore, it has the highest friction and pressure and will be less thickness after a time. To get maximum life from the shoes, you can remove the brake shoes and transpose them from front of axle to the rear. The self adjuster pin with the C clip will also have to be fitted to the front shoe which then become the rear shoe. same shoes running in same drum in same orientation to the drum just alternate position. I did that on my 69 series LC and the brakes were still roadworthy after 200,000km.
The wheel cylinder has nothing much to do apart from actuate the brake shoe, so it isn't the problem. Fairly normal wear as the cylinder applies the shoe but because of rotation and friction it is forced downward and tends to wedge the lower end. Therefore, it has the highest friction and pressure and will be less thickness after a time. To get maximum life from the shoes, you can remove the brake shoes and transpose them from front of axle to the rear. The self adjuster pin with the C clip will also have to be fitted to the front shoe which then become the rear shoe. same shoes running in same drum in same orientation to the drum just alternate position. I did that on my 69 series LC and the brakes were still roadworthy after 200,000km.
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johnceena88
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Re: Dmax Brake Lining Wear
IN agreement with everyone saying change them earlier - this condition creates a lot of wear on the rotors - so saving a buck on pads will cost more in a rotor too soon.
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Last edited by johnceena88 on Wed Feb 08, 2023 4:39 pm, edited 1 time in total.
Re: Dmax Brake Lining Wear
johnceena88
Why would you change them earlier???? just throwing money away if changing brakes before they are worn out. A worn brake show or pad sheds heat quicker and is less likely to fade than a thick brake material when new. How does this condition create a lot of wear on rotors. The y would be the same pad material and the same rotor cast iron, so same as when you started new! Here we are talking about brake shoes and drums, ie, drum brakes, no pads or rotors involved. Other end YES. Wait for the insertion of a link I reckon.
Why would you change them earlier???? just throwing money away if changing brakes before they are worn out. A worn brake show or pad sheds heat quicker and is less likely to fade than a thick brake material when new. How does this condition create a lot of wear on rotors. The y would be the same pad material and the same rotor cast iron, so same as when you started new! Here we are talking about brake shoes and drums, ie, drum brakes, no pads or rotors involved. Other end YES. Wait for the insertion of a link I reckon.
Re: Dmax Brake Lining Wear
Yep, drums are robust & can be easily machined out if they are scored, pretty common practice in the trucking industry.