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  #1  
Old 01-03-2022, 06:25 PM
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Caliper Support Bolt Replacement (2004 X5 3.0i)

Hey gals & guys,
Appreciate any guidance. I have 3 options for these bolts once they are removed (to replace the rotors):
1- Replace with BMW bolts costing around $300 for all 4 wheels, 8 bolts
2-Replace with same grade bolts (10.9) from the local bolt supplier ($40 total)
3-Reuse. Bolts look fine with no sign of wear/rust at all.
Please help me choose a right option.
Thanks,
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  #2  
Old 01-03-2022, 07:00 PM
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I've never replaced caliper support bolts (assume you're referring to caliper bracket bolts)... so I guess option 3 would be my vote. Clean and reuse.
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  #3  
Old 01-03-2022, 07:32 PM
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Reuse unless there’s an issue. These aren’t special bolts, so there’s no real need to spend $300.
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Old 01-03-2022, 07:37 PM
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Yep, just reuse. No point of replacing them.
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  #5  
Old 01-03-2022, 08:40 PM
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Quote:
Originally Posted by nick325xit 5spd View Post
Reuse unless there’s an issue. These aren’t special bolts, so there’s no real need to spend $300.
They are in a way special; they are grade 10.9 and are plated not plain. The washers are of hardened type.
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Old 01-03-2022, 11:34 PM
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Caliper Support Bolt Replacement (2004 X5 3.0i)

They are not torqued near yield I reuse. Does BMW recommend non reuse? They often do for CYA legal reasons in suspension parts.

From TIS:

2AZ
Brake caliper to steering knuckle
(screws lightly oiled, contact surfaces between brake caliper and steering knuckle cleaned and grease-free)

110 N·m.

It states if self locking or microencapsulated replace them.

I'm not aware that E53 uses either.

I reuse them.
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Last edited by andrewwynn; 01-04-2022 at 01:38 AM.
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  #7  
Old 01-04-2022, 11:14 AM
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Quote:
Originally Posted by 2004bmwx53i View Post
They are in a way special; they are grade 10.9 and are plated not plain. The washers are of hardened type.
There's nothing unusual about that. If you hadn't been aware of the specs, I'd have brought that up, but you already know to buy hardware of the correct spec.
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Old 01-04-2022, 12:33 PM
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Reuse the bolts for the bracket to hub. Replace the pins that hold the caliper to the bracket. Replace the caliper mounting boot as well. Reinstall the new pins DRY.

Note: At 100K I personally replace all bolts, boots, lines, rebuild the calipers etc at the brakes. The replacement bolts use a male TORX head, so you will in the future need a FEMALE Torx socket. The ability to torque and unbolt is improved moving forward at the socket self centers on twist.

?????
We are discussing #3 on Image below I looked up the costs from a local dealer.
Hex bolt M12X1,5X41 ZNS3 4 11/2005 34116767217
The cost is
Disc Brake Caliper Bracket Mounting Bolt - BMW (34-11-6-767-217)

MSRP: $17.98
Discount: $3.59 (20% off)
Sale Price: $14.39

I think to OP clicked on the assembly part (Bracket, bolts,etc) number #2
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Last edited by StephenVA; 01-04-2022 at 12:58 PM.
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  #9  
Old 01-04-2022, 02:47 PM
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Quote:
Originally Posted by StephenVA View Post
Reuse the bolts for the bracket to hub. Replace the pins that hold the caliper to the bracket. Replace the caliper mounting boot as well. Reinstall the new pins DRY.

Note: At 100K I personally replace all bolts, boots, lines, rebuild the calipers etc at the brakes. The replacement bolts use a male TORX head, so you will in the future need a FEMALE Torx socket. The ability to torque and unbolt is improved moving forward at the socket self centers on twist.

?????
We are discussing #3 on Image below I looked up the costs from a local dealer.
Hex bolt M12X1,5X41 ZNS3 4 11/2005 34116767217
The cost is
Disc Brake Caliper Bracket Mounting Bolt - BMW (34-11-6-767-217)

MSRP: $17.98
Discount: $3.59 (20% off)
Sale Price: $14.39

I think to OP clicked on the assembly part (Bracket, bolts,etc) number #2
OP is Canadian. Much higher prices and a markup for the exchange rate on top.
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1989 M3 S54B32

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  #10  
Old 01-04-2022, 02:54 PM
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Reuse them. There's nothing special about them besides the grade. As Andrew said, they're not torque to yield. If you are concerned, get proper grade bolts from a local supplier. No point in paying BMW's stupid mark up for a bolt you can get for a lot less.
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