Torque Spec - Front Caliper Bracket - 04 2500 - Dodge Cummins Diesel Forum
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Old 07-10-2012, 07:54 AM   #1 (permalink)
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Torque Spec - Front Caliper Bracket - 04 2500

The factory shop manual for our 2004 Ram 2500 suggests 250 lb-ft for the tightening torque on the M16 front-brake-caliper-bracket bolts. These bolts attach the brake-caliper carrier to the steering knuckle.

This value seems excessive for an M16 fastener, regardless of its strength specification. The bolt heads are not marked with a recognizable strength designation [8.8, 10.9, 12.9, etc]. Also, when removing the bolts, they sure did not seem to be tightened to 250 lb-ft.

If anyone can shed some light on this, it would be appreciated.

Thanks.
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Old 07-10-2012, 08:02 AM   #2 (permalink)
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I think its closer to 150 ft/lbs, but they are pretty massive fasteners. I don't think you're going to hurt them by torquing to 250. I run them down with an impact, never had a problem.
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Old 07-10-2012, 08:19 AM   #3 (permalink)
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Thanks for responding. The removed bolts appeared to have Loctite on them, and the factory manual is silent on this. Do you Loctite these bolts?
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Old 07-10-2012, 08:28 AM   #4 (permalink)
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In my experience, it's not needed to ensure proper clamping load of the joint. That being said, if you want the extra piece of mind, a little blue loctite can be applied to the threads upon reassembly.
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Old 07-10-2012, 10:19 PM   #5 (permalink)
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How about this from the service manual?
INSTALLATION - FRONT Caliper Adapter page 5-22
(1) Install the caliper adapter to the steering
knuckle.
(2) Install the caliper adapter mounting bolts and
tighten to 176 Nm (130 ft.lbs.).

Installation: Front AXLE nut
This starts at step 6 in the service manual. page 3-69
(6) Install axle washer and nut. Tighten axle nut to 179 Nm (132 ft. lbs.).
(7) Rotate axle several 5 to 10 times to seat the wheel bearing.
(8) Tighten axle nut to final torque of 356 Nm (263 ft. lbs.).
(9) Align nut to next cotter pin hole and install new cotter pin.

I think you were looking in the wrong section of the service manual.
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Old 07-10-2012, 10:28 PM   #6 (permalink)
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BINGO! I thought it was around 150. 130-150 sure...
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Old 07-11-2012, 07:27 AM   #7 (permalink)
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The factory shop manual makes the distinction between a "HD" [presumably "Heavy Duty"] axle and a "LD" axle. The 130 lb-ft value applies to the LD axle. One can infer which axle the truck has by looking at the brake-rotor sizes, as the different brake-rotor sizes correspond to either the HD or LD axles. The 2500 chassis uses the HD axle, according to the shop manual.

For the 2500 chassis, the torque spec for the caliper-bracket bolts is listed as250 lb-ft.

Thanks.
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Old 07-11-2012, 10:01 AM   #8 (permalink)
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Quote:
Originally Posted by 02vito View Post
The factory shop manual makes the distinction between a "HD" [presumably "Heavy Duty"] axle and a "LD" axle. The 130 lb-ft value applies to the LD axle. One can infer which axle the truck has by looking at the brake-rotor sizes, as the different brake-rotor sizes correspond to either the HD or LD axles. The 2500 chassis uses the HD axle, according to the shop manual.

For the 2500 chassis, the torque spec for the caliper-bracket bolts is listed as250 lb-ft.

Thanks.
What page is this in the service manual 'cause I don't see it.
+ if you're going to ask for and get legitamate comments, why contradict them and do what you want to anyway?
waste of our time.
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Old 07-11-2012, 07:33 PM   #9 (permalink)
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Bob,

I am sorry that you feel I am contradicting posts. I felt I was simply citing the information in my 2004 Ram factory shop manual, Pages 5-8 and 5-9. Perhaps I should have included the 130 lb-ft value for the LD axle in my original post.

The reason for my original post is that the manual lists the torque value for the bolts in question at 250 lb-ft, a value that I think might be high for an M16 fastener. I was hoping someone in this group could reinforce the 250 lb-ft value by stating that they tighten the bolts this tight.

As for what I want to do, I want to tighten the bolts to the correct value.

I am also sorry if I wasted your time.

Thank you for your comments.
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Old 07-12-2012, 12:29 PM   #10 (permalink)
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Quote:
Originally Posted by 02vito View Post
Bob,

I am sorry that you feel I am contradicting posts. I felt I was simply citing the information in my 2004 Ram factory shop manual, Pages 5-8 and 5-9. Perhaps I should have included the 130 lb-ft value for the LD axle in my original post.

The reason for my original post is that the manual lists the torque value for the bolts in question at 250 lb-ft, a value that I think might be high for an M16 fastener. I was hoping someone in this group could reinforce the 250 lb-ft value by stating that they tighten the bolts this tight.

As for what I want to do, I want to tighten the bolts to the correct value.

I am also sorry if I wasted your time.

Thank you for your comments.
Nothing to be sorry for!
Just kinda cranky the other night, my bad.
Anyway go to this site/link for a torque chart.
STANDARD TORQUE VALUES - METRIC SYSTEM
even if the bolt is marked 12.9 (strength) 273 lb/ft is the MAX for an M16 bolt so if you are not sure of the grade (12.9 is the highest, if I remember correctly) you are either going to be bumping up against the max OR break the bolt. I think that happens alot as there are alot of threads out there about broken adapter bolts! like i said go to page 5-22.
I used 130 lb/ft for mine w/locktite BTW.
Bob
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