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  #1  
Old 06-17-2008, 12:05 AM
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w126 caliper swap

I'm working on swapping parts from a 86' 420 SEL to an 85' 300SD. Parts catalogs show a different front rotor number. If I swap the rotors and calipers together, will the 420 caliper bolt up to the 300SD front spindle? Will the bearings and seal fit the spindle?

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Old 06-17-2008, 07:03 AM
JimFreeh's Avatar
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I suspect they interchange as a unit, but not 100% on that.

I DO know you need 15" wheels if you use the 86 and up front brakes....

Jim
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Old 06-17-2008, 10:43 PM
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Thanks, I thought so too. I'll let you know how it works
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Old 06-17-2008, 11:57 PM
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If the sizes are similar to the 560SEC front rotors, you might need to modify or remove the dust shields.

I just upgraded from the sliding caliper design that came on the 380 and 500SECs to the larger fixed caliper design from the 560, and other than that, it was basically a bolt on.
The only other thing I noticed wouldn't be a problem for a SD, as it was just that the sliding caliper design used a different wear sensor harness than the fixed caliper brake rotors had.

Happy wrenching!

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