Re: [Chrysler300] AAJ disc brake bracket
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Re: [Chrysler300] AAJ disc brake bracket



There is a slight chance the gm bolt is some kind of interference fit by design, but I doubt that is repeatable over several uses . Lock nuts are made like that , a certain kind . But must be one use only? I do not have as much faith in locktite as others . It can fail to "take off" .. How do you know it did ? I had that happen in manufacturing environment And fairly low heat releases it . Brake caliper , er , might get warm .. 
Must be torque spec issue again.. As I agree, gm cars do not generally lose brakes this way 

Sent from my iPhone

> On Oct 24, 2015, at 10:07 AM, 'Henry Schleimer' henry.schleimer@xxxxxxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:
> 
> Hi Larry
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> I am not familiar with the kit.  Does the GM bolt screw into a hole that is tapped in the AAJ bracket?  If so I’d suspect the AAJ threaded hole has a loose tolerance fit rather than a tight tolerance fit.  This is a mistake that GM wouldn’t make and probably why millions of GM products aren’t experiencing brake failure.
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> Just a theory.  I found out the hard way when making threads on mower drive shafts in a machine shop when I was a student.   Had to scrap a whole bin full of machined shafts when the supervisor found the cutting die on the lathe I was working  was inadvertently flipped to the loose setting and not noticed.  Mower drive shaft nuts must be tight on the thread otherwise they vibrate off (with nasty consequences)!
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> Regards
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> Henry
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> From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Larry Jett LarryWJett@xxxxxxxxx [Chrysler300]
> Sent: Saturday, 24 October 2015 3:10 AM
> To: chrysler300@xxxxxxxxxxxxxxx
> Subject: [Chrysler300] AAJ disc brake bracket
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> 
> Reference to earlier posts from me to the group. I am in Oregon assessing the damage on the 1968 Charger where the caliper attached to the AAJ bracket came loose and separated from the rotor causing loss of braking.  From photos I had assumed that the attaching bolts clamping the bracket to the steering parts had separated.  THIS IS NOT THE CASE.  The AAJ bracket remained attached as it should have.  What did fail was the GM designed bolts that you undo to effect change of pads.  Several of us using this system have found that these two bolts per caliper need Lock-tite and periodic inspection to insure their solidarity.  I did remove the original grade 8 bolts attaching the AAJ BRACKET on my 300 and replaced them with slightly longer bolts that I drilled and cotter-pined, but there has been no evidence that this is a safety concern.  MEA CULPA  
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> Larry Jett      Message sent from my........who cares?
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> [Non-text portions of this message have been removed]
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> ------------------------------------
> Posted by: "Henry Schleimer" <henry.schleimer@xxxxxxxxxxxxxxx>
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Posted by: John Grady <jkg@xxxxxxxxxxxxxxxxx>
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