C1 brake expert
Concerning the rear brake shoes. What causes the front, top, inside of the rear shoe to wear. Everywhere else the shoes have plenty left. New brake lines and wheel cylinders. Thanks
Terry
Terry
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Re: C1 brake expert
Are the shoes up against the backing plate. Pull off the hub and look all the way around the shoe to see if it is square. Were the drums turned true? Is the fit correct around the pin at the top? Springs on correct? -
Re: C1 brake expert
Both rear wheels or one?
2 possibilities maybe?
Hung up park brake cable.....or.....
The shoes are not adjusted out far enough. Because the adjusters are at the bottom and are the pivot point, if they're in too far, the wheel cylinder is going to push the top of the shoe way out to make contact. Why just the rear shoe is a good question for the physics majors I guess.
RichComment
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Re: C1 brake expert
I would check the anchor pin ( large pin at top ) to see if it is worn/ grooved and the area of the brake shoe that contacts the pin. When the brakes are applied the primary ( front ) shoe plus the rotation of the drum causes the shoes to "rotate" slightly. The secondary ( rear ) shoe pushes aganist the anchor pin. If the anchor pin and/or the circular cutout in the shoe that contacts the pin is worn ( elongated ) it might be forcing the shoe to move in a upward motion causing wear at the top. I hope this makes sense.
ErichComment
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Re: C1 brake expert
Thanks Guys, everything seems to be the way it should be, the drivers side is worn more than passenger by just a little bit, but never seen them wear on the inside top like this.
TerryComment
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Re: C1 brake expert
I think Eric is right on with this. Drum brakes have a self applying property do to the rotation of the wheel. The top portion of the secondary (rear) shoe is the hardest working area. The front shoe wants to pull around with the wheel rotation. Since the back shoe rests against the anchor pin at the top there is no where for it to go and shoe is forced up and into the drum.
If the arc of the shoes don't fit the drum just right the wear pattern can be more pronounced since there is less shoe contact in the drum in other places. I'm a believer in arcing the shoes to match the drums. It does take some of the life off of them but if you can get it done you will love how the brakes feel - progressive and no pull when applied. The problem is finding someone who will still do this work now that it is not legal in most states. The government agencies don't seem to care that the shoes are no longer asbestos, I guess they just don't want any dust in the air. I was even thinking of buying an old Ammco Shoe Arcing Grinder on ebay just so I could always do my own.
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