90 Rear Drum to Disc Swap - Defender Source
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Old April 27th, 2016, 11:32 AM
TigerDan's Avatar
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1991 RRC
Join Date: Apr 2010
Location: Northern California
Posts: 189
90 Rear Drum to Disc Swap

I'm about to do a rear drum-to-disc swap on an '83 90, I have a DI rear axle I'll swap in complete which will also give me 10-to-24 spline conversion as well as sway bar mounts (going to swap in the front as well.)

This 90 has a brake bias valve located on the right frame rail just forward of the bulkhead. I'm presuming I'll need to replace it, but I'm not sure. I've seen a lot of info saying replace it with one from a DI, or with one from a non-ABS RRC, or just leave it, or eliminate it. I was looking at the NTC8836 s a possibility.

Also wondering if I need to change the master cylinder. Looking at RovahFarm's site I don't a different one listed for disc or drum so I'm thinking not...

1991 RRC 4.2, R380, LT230, TrueTrac, Detroit, sliders, 33s, blahblahblah....
1994 RRC LWB
1994 RRC SWB
1995 RRC LWB 25th Anniversary Edition
1995 D90 project
1961 SII
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Old April 27th, 2016, 11:35 AM
javelinadave's Avatar
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1989 110SW 1 of 2,000,000
Join Date: Sep 2003
Location: Scottsdale, AZ
Posts: 5,380
Same MC so no swap required.
:O [==] O:
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