rhauri Posted January 29, 2018 Share Posted January 29, 2018 Hey folks,I've had a good look in the archives and can't quite find what I need to know; and the Caterham Parts website isn't the most clear or informative either.My car is a 2003 with de-dion axle with standard Sierra rear calipers.I've seen these, but what are they? Rear Ford Sierra discs (253mm diameter) or Triumph Spitfire discs (232mm diameter)?https://caterhamparts.co.uk/brake-discs/391-brake-disc-front-and-rear.htmlAlso, I've read that getting new disc to hub bolts is recommended when changing brake discs as the heads are very shallow and round off easily. Again, the Caterham parts website not being very clear; is that these ones:https://caterhamparts.co.uk/fixings-other/5422-bolt-reduced-head-big.htmlThanks for any help in advance!Rhauri Link to comment Share on other sites More sharing options...
rj Posted January 29, 2018 Share Posted January 29, 2018 It's not the right bolts, they will be a lot shorter.Must admit that I can't find the right one though. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted January 29, 2018 Member Share Posted January 29, 2018 In that case I'd ask Darren at Caterham or Redline.Jonathan Link to comment Share on other sites More sharing options...
Area Representative Richard Price Posted January 29, 2018 Area Representative Share Posted January 29, 2018 The rear discs are 232mm Triumph discs (cheaper from a motor factors or Triumph specialist):-http://www.jamespaddock.co.uk/brake-disc-7I can't find the bolts on the caterham parts site either, but, as JK says, I'd call redline if I needed some. Link to comment Share on other sites More sharing options...
ncm Posted January 29, 2018 Share Posted January 29, 2018 The bolts used on my 1990 car are listed as part no. 79085. These appear on the Caterham site here :- https://caterhamparts.co.uk/fittings/420-bolts-fia-roll-over-bar-special.html?search_query=79085&results=1Not surprising they can't be found! Brian. Link to comment Share on other sites More sharing options...
rj Posted January 29, 2018 Share Posted January 29, 2018 Not surprised they are used for FIA rollbars though - these also have a turned down head to clear the shock absorber. (And can be a pain to remove).. Link to comment Share on other sites More sharing options...
Drumster Posted January 29, 2018 Share Posted January 29, 2018 Best way to remove these type of bolts is to buy a spare socket ( can’t remember exact size) and grind off the chamfered edge. The socket is then able to get a good purchase on the bolt head.Another tip is to place the hub in an upturned wheel and get someone to stand on the tyre while you use a breaker bar with the ground down socket and the bolts will come out easily. Just replaced my discs this weekend which had been in place for many years. Link to comment Share on other sites More sharing options...
Wrightpayne Posted January 29, 2018 Share Posted January 29, 2018 Pretty sure Roger Swift (ECR) fitted cap head allen bolts but the clearance is tight with the cast bearing carrier.Echo what everyone else has said - I have a ground 14mm socket in the tool box. Cannot get to my tub of spare bolts in the garage to check socket fits as car parked too close to tub! I’ll report back later.RegardsIan Link to comment Share on other sites More sharing options...
rhauri Posted January 29, 2018 Author Share Posted January 29, 2018 Thanks so much all, a wealth of great information. And thanks for pointing me in the right direction for the discs and bolts! Link to comment Share on other sites More sharing options...
Toby S Posted January 29, 2018 Share Posted January 29, 2018 For what it's worth, when I changed my rear disks, (1993 supersport) , I got the replacements from Moss (spitfire ones with the funny anti corrosion coating) for around a £10 a pair, and the whizzed the bolts off with an electric Sealey impact wrench with the desired size impact socket, after soaking them in WD40 - Had been in place for at least 10 years and came off a dream. Tightenedd them back up with locktite and torque wrench 35 Ib ft per handbook Link to comment Share on other sites More sharing options...
rhauri Posted January 30, 2018 Author Share Posted January 30, 2018 Good to know Toby; £10 per pair is very reasonable!Unfortunately I don't have an impact wrench but I have a trusty breaker bar. Thanks for the torque figure too; saves me looking it up. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted January 30, 2018 Member Share Posted January 30, 2018 ... and the whizzed the bolts off with an electric Sealey impact wrench with the desired size impact socket, after soaking them in WD40Well done.But WD-40 isn't a very good releasing fluid. I suggest PlusGas or similar. Unfortunately I've never found a proper comparative trial... does anyone know of one... or have several similar jammed bolts... ?Jonathan Link to comment Share on other sites More sharing options...
Domus Posted January 30, 2018 Share Posted January 30, 2018 I have a battery impact wrench.Can bring to LADS next week or you are welcome to collect this coming weekend.Never found anything better than PlusGasLet me know what you want to do. Link to comment Share on other sites More sharing options...
Area Representative paul richards Posted January 31, 2018 Area Representative Share Posted January 31, 2018 ive managed ok with an ordinary socket. just take care. Link to comment Share on other sites More sharing options...
TomB Posted January 31, 2018 Share Posted January 31, 2018 I did the bolting it to the tyre/wheel, flipping it over and kneeling on the tyre. With a big breaker bar, tapping on the sockets to the bolts to ensure a tight fit and spinach for breakfast, they came of reasonably easily. Link to comment Share on other sites More sharing options...
rhauri Posted January 31, 2018 Author Share Posted January 31, 2018 Thanks for the offer Peter, very kind.I'll try the wheel & breaker bar method first and if struggling I'll let you know.I've got a can of PlusGas in stock so I'll let them soak overnight too. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted January 31, 2018 Leadership Team Share Posted January 31, 2018 I suggest that when Tom's ordered his new Hi Spec rear calipers we all take our cars round to him and he can swap all our rear discs Stu. Link to comment Share on other sites More sharing options...
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