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Rear Disc Brake Conversion

Go to solution Solved by stephers,

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Hello All,


So I gathered up all of the parts I needed to do the VW rear disc brake conversion aside from brake lines. Yesterday I dove in disassembling everything, and was curious to see how much machining my rear hubs would need. When I started doing measurements, I realized something was wrong with my parts.


It seems that I can't use these VW rotors I bought over a year ago. My hubs measure 142mm's wide, and inside my rotors, they measure 125mm's. Look at these pics below. That means to use these rotors, I'd have to have to have 17mm's machined off, and that would get into the wheel studs. WTF!?


My rotors are solid, cross-drilled and slotted, and for a 1980 VW Rabbit and they measure 239mm x 12mm. I don't get it... What's the fix here? Anyone...





1974 2002 - Fuel Injected, Bored, Balanced
Wide-Body Resto-Mod w/Lots of Goodies!

My sites - 2002BMW.com & HIDupgrades.com

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There's a chamfer on the backside of the hub and it's just about the amount that needs to come off, if that's starting to look a little dicey you could turn some off the hub but I've not seen a mismatch that needed that.

If everybody in the room is thinking the same thing, then someone is not thinking.


George S Patton 

Planning the Normandy Break out 1944

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If you're handy, there are lots of ways to cut the hubs down a bit.


The first time I did it, I think I roughed it with an angle grinder,

then made a sleeve to mount the things in a drill press,

and used the angle grinder to round it off nicely.


When I was finished, it looked like it had been done by someone

who knew what they were doing!




Edited by TobyB
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"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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