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?

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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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles

Thanks, I thought so too. I'll let you know how it works

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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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...