D90 front calipers on RRC - different caliper bolt threads - Defender Source
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Old September 19th, 2015, 06:02 PM
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Charles Galpin
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D90 front calipers on RRC - different caliper bolt threads

On my EV I am running axles from a 1993 RRC, but am putting on D90 brakes. On there front the RRC brakes use a M12 1.25 thread bolt, but the D90 calipers use a bolt with a larger shoulder and 1/2 -13 course thread.

Has anyone run into this and what's the proper solution? I'm assuming it's a 1/2" bolt with a M12 1.25 thread on it, or I need to drill and tap my hubs to 1/2 -13 which I"m not keen on doing.

tia
charles
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Old September 20th, 2015, 09:46 PM
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Charles Galpin
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bump. Anyone?
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Old September 20th, 2015, 09:59 PM
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Can't you just swap the knuckles? I don't see an issue with drilling and taping?
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Old September 20th, 2015, 10:08 PM
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Charles Galpin
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There is not a lot of clearance to get a drill in from behind when installed, although I guess I could pull the hub/rotor and go from the outside in (I can't recall if these are through holes on ears or not). Of course I have already filled the housings with one shot grease!

And of course swapping knuckles is more time and cost too. Reading this I sound lazy. LOL

Would sleeving the bolts be dumb?
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Old September 26th, 2015, 06:40 PM
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Charles Galpin
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Quote:
Originally Posted by Brewie212 View Post
Can't you just swap the knuckles? I don't see an issue with drilling and taping?
Yeah I just tapped the threads in the knuckles. I don't see an issue with it either. I had to do the rears too.

However now I need bolts and the bolts I have are too long in the shoulder. I guess I need to determine if they need big washers (like > 1/8") or I need to buy something different. Hopefully with the same thread
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Old November 15th, 2015, 04:13 PM
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Charles Galpin
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I can't seem to win with this one. I got the right length bolts but they are m12x1.25!
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