ajh Posted February 22, 2016 Share Posted February 22, 2016 Does anyone know the real difference between the Defender and Discovery master cylinders beyond the deeper rod pocket on the Disco one? I'm using a Disco booster on a Defender and currently have things modified to work well, but a recent failure has me thinking that replacing the Defender master with a Disco one may make sense but I'm unsure if they're different bore/stroke again. 200/300TDI era. Quote Link to comment Share on other sites More sharing options...
Nigelw Posted February 22, 2016 Share Posted February 22, 2016 For sure 110s would be different, 90s might be the same? Look for part numbers to cross reference. Quote Link to comment Share on other sites More sharing options...
miketomcat Posted February 23, 2016 Share Posted February 23, 2016 Disco has more ports (200tdi) so you would need to completely Re plumb and change the front calipers. I have done this on 45. Mike Quote Link to comment Share on other sites More sharing options...
Maverik Posted February 26, 2016 Share Posted February 26, 2016 Or just block the extra ports on the master cylinder with bleed nipples... done that before. Is the disco reservoir not designed to be installed at all angle? I'm sure I've looked at this before. Quote Link to comment Share on other sites More sharing options...
miketomcat Posted February 26, 2016 Share Posted February 26, 2016 The reservoir on ours is pointing down hill but seems to work no problem. Mike Quote Link to comment Share on other sites More sharing options...
Maverik Posted February 27, 2016 Share Posted February 27, 2016 In my experience both the later (common) defender master cylinders and the disco ones are both pretty poorly made they seen to have a limited life span which ends up with the bores of the cylinder getting pitted which leads to then bypassing. Quote Link to comment Share on other sites More sharing options...
mickeyw Posted February 27, 2016 Share Posted February 27, 2016 This sounds an interesting idea. I've often thought of fitting the 110 with a 'double' servo from a ABS equipped Defender, as I'm told they give more boost. Used servos of this type are frequently found for Discos, but very few Defender ones. I've not sat anything side by side to compare each. In my old 90 I fitted a complete 300 Tdi pedal, master and servo assembly. That had the later type (non cast) cylinder, and I never had any failures with that. If corrosion is occurring in the cylinder it would suggest to me that the fluid needs changing more frequently. Quote Link to comment Share on other sites More sharing options...
western Posted February 27, 2016 Share Posted February 27, 2016 never had any failures with the cast type brake master cylinders on my 1989 110, in 20+ years, its not subject to constant road dirt,water like the disc,calipers are. the later master cylinders won't fit the earlier small diameter servo, because the stud location is different. Quote Link to comment Share on other sites More sharing options...
miketomcat Posted February 27, 2016 Share Posted February 27, 2016 I had to mod 45's pedal box to fit a disco servo and master cylinder. Mike Quote Link to comment Share on other sites More sharing options...
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