ThreeSheds Posted April 2, 2009 Share Posted April 2, 2009 I am beginning to wonder about my RRC Firstly I found that the rear discs are only 8mm thick (compared to 12.5 on the donor Disco) and they don't look like have worn or been skimmed - it looks like they were made that way. Now I notice that the trailing arms are way thicker on the Disco - 27.5mm dia compared to 20mm dia on the RRC. I am wondering if one or the other of them has an axle assembly from a different vehicle? Perhaps the heavier stuff that's on the Disco is from a 110? Can anybody throw some light on this? Yours, Confused... Quote Link to comment Share on other sites More sharing options...
HoggyN Posted April 2, 2009 Share Posted April 2, 2009 How old is it? I've got three 2 doors in various stages of decomposition/rejuvenation and none have trailing arms or discs that puny. Quote Link to comment Share on other sites More sharing options...
ThreeSheds Posted April 2, 2009 Author Share Posted April 2, 2009 How old is it?I've got three 2 doors in various stages of decomposition/rejuvenation and none have trailing arms or discs that puny. It's a 1990 3.9 V8 - the donor Disco is a 1991 200tdi. So you think that it's the RRC being puny rather than the Disco being brawny? Quote Link to comment Share on other sites More sharing options...
HoggyN Posted April 2, 2009 Share Posted April 2, 2009 So you think that it's the RRC being puny rather than the Disco being brawny? Yes, I think the Disco is standard. The brake disc is about 5mm under the minumum thickness. Not sure about the diameter of the trailing arms on later RRCs though. Maybe someone who has got one can advise. Quote Link to comment Share on other sites More sharing options...
ThreeSheds Posted April 3, 2009 Author Share Posted April 3, 2009 <..>The brake disc is about 5mm under the minumum thickness<..> 5mm ? I hope you were refering to the RRC 8mm discs and not the Disco ones I wanted to check the Disco discs too - since they look ok I don't intend to replace them at the moment, so I had a careful look through my official workshop manual but I couldn't find a minimum thickness quoted - just useful phrases like 'if the disc is worn' I actually wondered if the 'lightweight' RRC components are the result of some misguided efforts at reducing the unsprung weight - I can't imagine any other reason for fitting them other than sheer incompetance. But if they are the wrong components, then where did they come from? Do any other vehicles use these thinner bits? Still confused Roger Quote Link to comment Share on other sites More sharing options...
DrRob Posted April 3, 2009 Share Posted April 3, 2009 Trailing arms..IIRC Disco ones are hollow and Classic ones are solid..... Quote Link to comment Share on other sites More sharing options...
Strega Posted April 3, 2009 Share Posted April 3, 2009 Have just fitted upgraded disco trailing arms to my 86' 2 door and can confirm in my case at least that the disco arms are thicker. Quote Link to comment Share on other sites More sharing options...
steve_d Posted April 3, 2009 Share Posted April 3, 2009 My Dakar is based on a RRC 1987. the trailing arms are 32mm diameter. Steve Quote Link to comment Share on other sites More sharing options...
HoggyN Posted April 3, 2009 Share Posted April 3, 2009 My Dakar is based on a RRC 1987. the trailing arms are 32mm diameter.Steve All my 2 doors ('72 to '82) are 32mm. The minumum thickness for a RRC disc is normally 13mm or 11.7mm depending on the model brakepartssuperstore Quote Link to comment Share on other sites More sharing options...
ThreeSheds Posted April 4, 2009 Author Share Posted April 4, 2009 So trailing arms can be 20mm, 27.5mm and 32mm... Any advance on 32? I was quite happy with my recent enhancement from 20mm to 27.5mm, but now I have heard about 32mm I think I have trailing-arm envy Good source of info on the brakes, which confims that my Disco discs are ok to use (they are not significantly scored or lipped and are around 12.4mm thick) - thanks for that Roger Quote Link to comment Share on other sites More sharing options...
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