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Old 05-30-2005, 10:23 AM   #1
JRoger
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Dexter hydraulic disc brake problem

I guess this is an "exterior" related problem!

There was a recent post on the Yahoo Mobile Suites forum the someone that had a problem with the pad keeper bolt coming out and causing the pad to drop out then the calibpers causing damage to the disc, etc.

I checked mine on a new MS 38RL3 and found one bolt that has lost its nut and tried to back out but was stopped by the aluminum wheel, so far. Eventually the bolt would have broken and the pads would have fallen out. Luckily all I have is a slightly scored wheel.

Anyone with Dexter disc brakes should check this immediately.

If anyone has other "voices" it would be good to share this info.

Thanks!
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Old 05-30-2005, 10:57 AM   #2
robin
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Didn't he say the failure was due to the bolt being cranked down to tight causing the failure? That Dexter has made a modification using longer bolts so that they can't be cranked too tight anymore?
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Old 05-30-2005, 02:34 PM   #3
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Yes, that was his statement. I found that my pad keeper bolts were apparently of the new/shoulder type but still one of the nuts came off. If they can come off after the relief solution, they still need watching. I have contacted Dexter about a replacement nut. The nuts are a locking type but if they can come off, there is still a problem.

Thanks for helping clarify this issue.
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Old 05-30-2005, 03:02 PM   #4
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Well, wonderful. Sounds like the problem still isn't fixed. Here I thought we'd be OK since ours will an 05.
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Old 05-30-2005, 03:09 PM   #5
rverdlm
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I have some questions. Where are these bolts? Does the wheel need to be removed to see them? If so and you have your wheel off can you send a picture. Is dexter going to do a recall. Is this occuring with all the disk brakes from Dexter or is it only with the MS. I had my disc brakes installed by MorRyde a year and 25,000 miles ago. As of this time I have not had a problem. Am I now immune to this problem or do I need to take everything apart?
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Old 05-30-2005, 06:42 PM   #6
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From comparing the disc brake types on the Dexter web site, it looks like this is unique to the 8K axles. These disc brake units have a fixed dual pad system that uses one 4 inch by 1/4 inch bolt with 10/32 threds and a self gripping/slotted nut to hold both pads in place. The bolt is inserted from the outside with the wheels off and the nut is screwed on. The bolt and nut can be seen from under the unit and looking at the pad housing. The bolts with the shoulder can be moved back and forth slightly. Apparently the non-shoulder bolts were tightened down and then broke from the expansion/contracting from use. The fix for them was to loosen the nut one turn to allow space for expansion, etc.

You can see these units on the www.dexteraxle.com web site in the 8K brake kit. The pad keeper bolt is shown but not listed as a separate part number. Other Dexter disc brake units don't seem to use the pad keeper bolt system.

I don't know Dexter's position as I just learned of this on the Yahoo Mobile Suites forum today.

Out unit is an 05 with the shouldered bolts but the nut still has a tendency to come off for some reason. I'm not sure what the official long term fix should be except that I will take a pair of vice grips and smash the threads on the bolts to keep the nuts from coming loose.

The aluminum wheel has sustained some scorring but is not ruined. The bolt would probably broken soon.
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Old 05-30-2005, 06:53 PM   #7
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http://dexteraxle.com/inc/pdetail?v=1&pid=6843

This may be the link to the 8K axle kits showing pad keeper bolt.

Also, the 6K axle brakes have the same keeper bolt.
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Old 05-30-2005, 06:55 PM   #8
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OK, the link worked. The pad keeper bolt appears on the lower left of the parts picture.
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Old 05-30-2005, 07:10 PM   #9
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Disc Brake Problem

Roger: The system looks straight forward but I am not impressed with the hydraulic crossover line being at the bottom of the caliper halves. I noticed the retaining bolts are kind of small diameter for this application and have a question. Are the locking nuts of the Nylon insert variety? The heat that may develope and the stretching the bolt may be exposed to could dictate the use of double locknuts instead of the ny-lok variety. Oh well, that's just one more thing to modify after taking delivery. My D/W says I look for stuff to keep me busy while lazing away the winter in the south.
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Old 05-31-2005, 06:36 AM   #10
JRoger
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The nuts are not the nylon lock type. They are all metal with several slots to make a grip lock. Obviously something needs to be added to prevent them from coming off.

You are right about the bolt being small.

I have an email into Dexter on this.
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