Jonas240z Posted September 26, 2010 Share Posted September 26, 2010 Hi guys; I got the modern motorsports rear disk coversion kit for my 240z minus the disk brakes(i had some already. I went to mount the kit and everything was good until i tried fitting the calipers. As you can see by the pictures the caliper mounting points are to thick for the space between the disk and MM mount. The measurements are as follows; Caliper mounting thickness 1 1/4" Space available between disk and MM mount 1 1/16" Disk size 11 3/8 diameter, 1 7/16 hat thickness, 3/8 thick rotor. What am i doing wrong? do i have the correct parts? Thanks for the help in advanced. Quote Link to comment Share on other sites More sharing options...
Jonas240z Posted September 27, 2010 Author Share Posted September 27, 2010 Any clue guys? i'm really frustrated because everything seams to be in order but it just won't fit in place. All my parts are the ones supposed to be used on this coversion jet for some reason it wont fit; does someone have measurement or a picture to show the way its supposed to be? My rotors are brembo, for a '84 300zx NA. Calipers from a junk yard '89 240sx. Kit from modern motorsports. Quote Link to comment Share on other sites More sharing options...
94porkchop Posted September 27, 2010 Share Posted September 27, 2010 Are the calipers squeezed? Quote Link to comment Share on other sites More sharing options...
19762802+2 Posted September 27, 2010 Share Posted September 27, 2010 Are the calipers squeezed? That isn't the problem he doesn't even have the brake pads on in the picture, the problem is the mounting surface is to close to the rotor. My only guess is that you may have the brackets on the wrong sides. Quote Link to comment Share on other sites More sharing options...
ModernS30 Posted September 27, 2010 Share Posted September 27, 2010 Have you tried 240sx rotors or 280zx rotors? My brackets (custom made for me) were supposed to be for 280zx calipers and rotors. As per info from this site. I machined them and found them to fit 240sx calipers with 280zx rotors. Quote Link to comment Share on other sites More sharing options...
ktm Posted September 27, 2010 Share Posted September 27, 2010 (edited) The Modern Motorsport kit uses the 300zx rotors. Check to make sure the caliper is opened all the way. By comparing the rubber boot in the two pictures, it appears that the caliper is extended in the lower picture. You see two folds in the first picture and only a partial fold in the second. Also, important, check that the piston is fully seated once you get the pads in. It is not pressed in but rather screwed into position. It takes quite a number of turns to get it to fit. Edited September 27, 2010 by ktm Quote Link to comment Share on other sites More sharing options...
Jonas240z Posted September 27, 2010 Author Share Posted September 27, 2010 AS 19752802+2 said, the real problem is the space between the MM mount and the rotor. The caliper won't fit into place since the mounting "ears" on the caliper are thicker than the space between the braket and rotor. The Mounts are on the correct side and torqued down to spec. The top picture is for reference to show the calipers i got. The bottom picture shows how the caliper does not fit between this space. It will only fit if it was machined down. That's why i'm puzzled? Any ideas? does anyone have dimentions or pictures to compare? Thanks again. Quote Link to comment Share on other sites More sharing options...
ModernS30 Posted September 27, 2010 Share Posted September 27, 2010 AS 19752802+2 said, the real problem is the space between the MM mount and the rotor. The caliper won't fit into place since the mounting "ears" on the caliper are thicker than the space between the braket and rotor. The Mounts are on the correct side and torqued down to spec. The top picture is for reference to show the calipers i got. The bottom picture shows how the caliper does not fit between this space. It will only fit if it was machined down. That's why i'm puzzled? Any ideas? does anyone have dimentions or pictures to compare? Thanks again. I will get some pictures with the zx caliper on it tomorrow. I have not yet got 240sx caliper for me. I will show you why you need 240sx calipers as well. (Tried 300zx rotors, they are to tall for my brackets with the 240sx calipers.) Quote Link to comment Share on other sites More sharing options...
Jonas240z Posted September 27, 2010 Author Share Posted September 27, 2010 I think i found the problem or at least why it does not go on. I tried to mount the Left side and it went on without a problem, so obviously there is something wrong on the Right side. As you can see on the pictures below, things just don't line up. Why? i really don't know. All surfaces are clean, inspected the bracket and compared to the Left side and they are both the same. Rotors are not warped. So again, i'm just getting more frustrated the more i find. By the way all bearings where replaced and studs as well. Any clues? Quote Link to comment Share on other sites More sharing options...
ModernS30 Posted September 27, 2010 Share Posted September 27, 2010 Its almost as if that bracket isn't sitting flush. Are you sure those are MM brackets? They look cast. MM brackets were machined I though? Sorry I had to ask. Do they set the caliper 45 degrees from the strut tube or 90 degrees? Quote Link to comment Share on other sites More sharing options...
Jonas240z Posted September 27, 2010 Author Share Posted September 27, 2010 They are MM brakets. I thought the MM were fully machined pieces but i guess not. I got them directly from them, the one on the left does not look like that when it's mounted and the caliper fits. A quick inspection/comparison between left and right mounts left me with more questions since both brakets are the same (one right one left) with no visual differance. I'll inspect them more closely tomorrow. It's hard to think the stub axle or strut mounting point is off. So something is not right. Quote Link to comment Share on other sites More sharing options...
fastzcars Posted September 27, 2010 Share Posted September 27, 2010 something was not machined right. remove and inspect the mount surface of the MM brackets. and check the inside of the rotors as well. Quote Link to comment Share on other sites More sharing options...
Daphur280 Posted September 27, 2010 Share Posted September 27, 2010 send them back Quote Link to comment Share on other sites More sharing options...
Scott_M67 Posted September 27, 2010 Share Posted September 27, 2010 Have you sent the photos to Ross yet, how come those brackets look like cast instead of the MM billet brackets? Quote Link to comment Share on other sites More sharing options...
Jonas240z Posted September 27, 2010 Author Share Posted September 27, 2010 Found the problem...thankfully the stub axle, rotor and bracket were all in good shape. The problem was a 1/16 in. interferance between the MM mount and the strut "mounting point, which in turn didn't let the bracket seat properly. I just grounded the portion down, now it fits like a glove. I have pictures of this to show but i'm at work right now. I really appreciate all the help from everyone here. Thank you! Quote Link to comment Share on other sites More sharing options...
fastzcars Posted September 28, 2010 Share Posted September 28, 2010 (edited) Found the problem...thankfully the stub axle, rotor and bracket were all in good shape. The problem was a 1/16 in. interferance between the MM mount and the strut "mounting point, which in turn didn't let the bracket seat properly. I just grounded the portion down, now it fits like a glove. I have pictures of this to show but i'm at work right now. I really appreciate all the help from everyone here. Thank you! great to hear you found the problem!! Did you ground down that offending "mounting point" on the MM bracket or the strut housing? A picture would help others in this case. And I would email ross and tell him what you found so he can either modify the brackets and or include instructions so this doesn't happen to other customers in the future! Edited September 28, 2010 by fastzcars Quote Link to comment Share on other sites More sharing options...
Jonas240z Posted September 28, 2010 Author Share Posted September 28, 2010 Here are the pics of the areas i had to ground off to make it seat properly. I don't know if the mount casting was out of spec or the defect came from the strut. I ended up grinding down both of them just in case. I hope this helps someone that might encounter the same problem. Thanks for the help from all of you! Quote Link to comment Share on other sites More sharing options...
bobbyc Posted September 29, 2010 Share Posted September 29, 2010 my MMS brackets were cast too...on the site they look machined. Quote Link to comment Share on other sites More sharing options...
94porkchop Posted September 29, 2010 Share Posted September 29, 2010 Thanks for the pictures. I will keep this in my favorites under brake upgrade. Quote Link to comment Share on other sites More sharing options...
ModernS30 Posted September 30, 2010 Share Posted September 30, 2010 I am quite surprized at the price on a cast part. I made my brackets out of 6061 aluminum, fully machined, and only spent 200 on both. Super glad I did that instead of wasted money on a cast bracket! Mine are probably stronger too. Quote Link to comment Share on other sites More sharing options...
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