supra_ufo Posted March 19, 2015 Share Posted March 19, 2015 Cutting a long story short.. I bought some UK brakes front and rear, and took them apart myself, decided I didn't have the time to refurb them myself so sent them off to a company and bagged all the bits and labelled it. The company are saying that the bolts (all of them) that I gave are M10x1.25 but the thread on the calliper are m9x0.8. Im not sure if Jay put the wrong bolts in the UKs when he refurbed them years ago but can someone verify if this information is correct please? Quote Link to comment Share on other sites More sharing options...
Scott Posted March 19, 2015 Share Posted March 19, 2015 M9 sounds like a very strange size to me. Is it the actual bolts for holding both halves of the caliper together? Quote Link to comment Share on other sites More sharing options...
Scott Posted March 19, 2015 Share Posted March 19, 2015 Clearly not that urgent Quote Link to comment Share on other sites More sharing options...
Iky Posted March 19, 2015 Share Posted March 19, 2015 I just spoke to him on the phone Scott. I helped him take them apart. I think the refurb place is mistaken. They may have mixed up the bolts. 2 different lengths on each calipers, on each axle. They may have tried to put the wrong one in the wrong hole! Quote Link to comment Share on other sites More sharing options...
Scott Posted March 19, 2015 Share Posted March 19, 2015 I just spoke to him on the phone Scott. I helped him take them apart. I think the refurb place is mistaken. They may have mixed up the bolts. 2 different lengths on each calipers, on each axle. They may have tried to put the wrong one in the wrong hole! They are all the same thread though. Quote Link to comment Share on other sites More sharing options...
supra_ufo Posted March 19, 2015 Author Share Posted March 19, 2015 M9 sounds like a very strange size to me. Is it the actual bolts for holding both halves of the caliper together? yes holding the halves, sorry my lunch was more urgent LOL - - - Updated - - - They are all the same thread though. thats what I thought So to confirm the bolt is M10x1.25 Quote Link to comment Share on other sites More sharing options...
Scott Posted March 19, 2015 Share Posted March 19, 2015 yes holding the halves, sorry my lunch was more urgent LOL - - - Updated - - - thats what I thought So to confirm the bolt is M10x1.25 I can't confirm now bud. I believe that's what it is, I can't see it being a 9mm. If you don't get the answer you are after I'll check mine tonight when I get in from work. There's no way you could mix the bolts up though. Quote Link to comment Share on other sites More sharing options...
supra_ufo Posted March 19, 2015 Author Share Posted March 19, 2015 (edited) how can they measure the threads on the calliper as M9x08... I only used them because they recently did Rics calliper and I wanted a decent painted service. Only difference is that I took the callipers apart myself. Edited March 19, 2015 by supra_ufo (see edit history) Quote Link to comment Share on other sites More sharing options...
Scott Posted March 19, 2015 Share Posted March 19, 2015 how can they measure the threads on the calliper as M9x08... I only used them because they recently did Rics calliper and I wanted a decent painted service. Only difference is that I took the callipers apart myself. I might tell them to man up and just bolt the dam things into the calliper threads. It's easy to check. 9mm is a big difference from 10mm. It's not hard to measure the inner minor diameter and compare that to an M9/M10 thread. Set of vernier calipers would tell you in seconds. Quote Link to comment Share on other sites More sharing options...
Scott Posted March 19, 2015 Share Posted March 19, 2015 M10x1.25 minor diameter is around 8.5mm. M9x0.75 minor diameter is 8mm. Ask them if they have a set of calipers and can measure the bore of the thread. Whatever one it is from those figures is the thread that it is. I can't find anything on M9x0.8. Quote Link to comment Share on other sites More sharing options...
supra_ufo Posted March 19, 2015 Author Share Posted March 19, 2015 There saying it "almost feels like the right bolts but then they have a bit of trouble going that last bit and we don't want to damage the thread" Quote Link to comment Share on other sites More sharing options...
spidermonkey Posted March 19, 2015 Share Posted March 19, 2015 I would be surprised if they are M9, that is a very unusual size, like Scott has said just check the threaded holes with a vernier Quote Link to comment Share on other sites More sharing options...
supra_ufo Posted March 19, 2015 Author Share Posted March 19, 2015 They sent me a picture of the bolts, assuming these are the same ones I sent them shall I ask them to proceed? "They go so far and our technician was worried about them snapping if he tried any harder" I can just order a set from Mr T and send direct to them Quote Link to comment Share on other sites More sharing options...
Burna Posted March 19, 2015 Share Posted March 19, 2015 Looks like a set of M10's and a set of M8's to me. Quote Link to comment Share on other sites More sharing options...
np89 Posted March 19, 2015 Share Posted March 19, 2015 If they "refurbed" them did they paint or powdercoat them and then forget to run a tap down the bolt holes? This would cause the issues they are describing Quote Link to comment Share on other sites More sharing options...
Iky Posted March 19, 2015 Share Posted March 19, 2015 If they "refurbed" them did they paint or powdercoat them and then forget to run a tap down the bolt holes? This would cause the issues they are describing I'd say this is the case. Quote Link to comment Share on other sites More sharing options...
Scott Posted March 19, 2015 Share Posted March 19, 2015 Those bolts need a really good clean to get the corrosion off them. If the bores are anything like that then they could definitely do with a tap going down them. Ask them to put a bit of copper slip on the bolts and see if it goes down then. I would definitely give the bolts a clean with a copper brush first though. Quote Link to comment Share on other sites More sharing options...
supra_ufo Posted March 19, 2015 Author Share Posted March 19, 2015 They told me they had cleaned them but it doesn't look cleaned. They are going to tap them out if I can't source parts with in a decent time frame. The calipers have not been painted just the seals been replaced and Pistons refurbed. Painting is done after yes the bolts are painted. Quote Link to comment Share on other sites More sharing options...
Scott Posted March 20, 2015 Share Posted March 20, 2015 Doesn't sound like a very well informed shop to be honest. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 21, 2015 Share Posted March 21, 2015 They are a rare metric fine thread, in a long length, also with a long grip length. Toyota don't sell them. I found ten cap heads that would shorten and work from an on line source that had been specially ordered for some one off job, then never collected. I used them all. They may well be M9, I can't remember, but they definitely are NOT a 1.25 pitch, they are finer. I warned of screwing up threads ages ago as replacements are going to have to come from scrap UK calipers I would imagine, as custom rolled thread bolts will be more than new calipers cost. Quote Link to comment Share on other sites More sharing options...
Dnk Posted March 21, 2015 Share Posted March 21, 2015 (edited) If i remember correctly the caliper bodies are counter bored above the thread so you wont be able to measure the core diameter with a vernier caliper. On the fronts the bolts are obviously different lengths which should be pretty hard to get the wrong way round Afraid i can't for the life of me remember what the thread sizes were but don't think they are a standard metric thread Edited March 21, 2015 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Dnk Posted March 21, 2015 Share Posted March 21, 2015 (edited) The bolts look the correct ones in your photo, here is a set i did and another photo showing the clearance diameter in the side of the caliper which the bolts screw into. The pink arrows show where the bolts screw into the cast steel side of the caliper and show the counter bore before the threads. I'd get a fine pik or scriber and use that to put down to the bottom of the hole to check its not full of crap, use brake cleaner and spray down the hole then blow out with an airline. I had to do this on all the calipers i did as they were chemically stripped and the bottom of the holes were full of debris which stopped the bolts from going all the way down Edited March 21, 2015 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 21, 2015 Share Posted March 21, 2015 Yep, they'll have got blast media in them, assuming you had them stripped. There's not enough meat in the castings to drill out and helicoil, or drill and tap oversize. So if they don't take care they'll end up scrap. Quote Link to comment Share on other sites More sharing options...
MattP Posted March 21, 2015 Share Posted March 21, 2015 I had this problem putting mine together they went almost all the way in all but the last 5mm and fealt like they would snap if tightened any more... It was extremely time consuming but I used wd40 and a Allen key it scraped loads of shit out of the thread holes then blasted them out with the air line. Repeat process then they went in no bother.. Quote Link to comment Share on other sites More sharing options...
supra_ufo Posted March 21, 2015 Author Share Posted March 21, 2015 Cheers guys Quote Link to comment Share on other sites More sharing options...
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