Drum brake pad cracks? - Defender Source
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  #1  
Old July 7th, 2012, 02:18 PM
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Chad Davis
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Drum brake pad cracks?

Is this brake pad supposed to be or is this normal /ok?

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Chad
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  #2  
Old July 7th, 2012, 04:17 PM
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Jason Lavender
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No...definitely no ok. I *think* that's caused by too much pressure of the brake shoe against the drum. How old are the brake shoes?
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Old July 7th, 2012, 05:33 PM
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Chad Davis
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Their brand new. Couple months but shady mechanic.
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  #4  
Old July 7th, 2012, 06:15 PM
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Jason Lavender
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What brand are they? Could be a manufacture defect too...may be worth contacting the company directly.

Rears on early D's were drums too (unless the rear axle has been replaced/updated, which is a common change).
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Old July 7th, 2012, 06:52 PM
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Chad Davis
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It's a series 2a. 66 or 68 not 100% sure. Those are proline from rovers north. The truck is owned by one of the members of our club and they didn't look to be right to me. He was having to pump the brakes a lot and had intense vibrations at about 40 mph. After we took the pressure off the drums/pads, no vibrations and the brakes aren't stiff but are working better. Needing to bleed them I think. Before we worked on them the wheels were super stiff when on the lift. Now they move easily.
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Old July 7th, 2012, 07:22 PM
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Jason Lavender
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Hmmm....so if they were mal-adjusted with too much pressure on them initially (ie tough to spin the wheels), that would build up some decent heat - which would crack the pads. I think we have the culprit.
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Old July 7th, 2012, 07:28 PM
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Chad Davis
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god I love this forum
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  #8  
Old July 7th, 2012, 10:29 PM
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Looks like a 4cyl 109 front.
Heat will do it.
Linings (pads are on disc brakes) will also crack from loose rivets. But these look to be bonded linings.Other things that will cause it is mismatch between the linings and drum (different arc radius). You can get this when a drum is turned and the linings aren't sanded down to match. Or it could be a mfg defect.
Are you sure they are new? The metal part of the leading shoe looks to be pretty rusty for being new. Looks like a lot of rust on the lining also.

In any case, when replacing them, the new shoes need to be centered as part of the installation/adjustment process.
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  #9  
Old July 7th, 2012, 11:23 PM
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Brian
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I'm a friend of chads working on this project today. The shoes are new no rust just the lighting I think. I think heat is the culprit as well. I think you are on to something with the radius not matching they looked closer to the edge near the middle than at the ends. We adjusted the snail cam all the way out and they still rubbed. I have seen other posts on the springs causing trouble. Does anyone have a picture of the proper spring set up for the front brakes on a 109. I think we had it right but it would be nice to see a pic.
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