mantageek88 Posted February 10, 2023 Share Posted February 10, 2023 Hi, a newbie question. I'm from Croatia so there aren't a lot of people modifying manta's and I was looking to upgrade my rear drums to discs. I couldn't find information here if the car will be able to pass the croatian version of MOT or TUV. Are there kits that come with a certificate? I see a lot of people doing this conversion, but I read on some forum that switch from drums to discs could be dangerous because of the brake force bias. Is this really a problem? Should i just leave it alone?😅 Thanks in advance! Quote Link to comment Share on other sites More sharing options...
Sutty2006 Posted February 10, 2023 Share Posted February 10, 2023 To be completely honest, you don’t really get much gain from rear disk kits unless you modify EVERYTHING else. I have Sierra Sapphire rear calipers using mk3 escort front disks and they pull the same force as the drums used to. I’ve not heard of any certification for disk kits sold in the uk. We don’t really know anything about the Croatian TUV test either 1 Quote Link to comment Share on other sites More sharing options...
®evo03 Posted February 10, 2023 Share Posted February 10, 2023 Valid point would be interesting to see the braking efficiency, but would have to be tested at optimum condition. Both drum and brake being in top condition, takes both a while to get in, or burn of the newness. Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted February 10, 2023 Share Posted February 10, 2023 The advantage of disc and pads is dissipating heat and progressive forces. But in terms of overall brake power, the drum still has the advantage if the friction to road surface is good, but they lock up sooner. Think of HGVs Quote Link to comment Share on other sites More sharing options...
Moonmonkey Posted February 10, 2023 Share Posted February 10, 2023 (edited) Don’t know about the TUV but there is this guy on German EBay does full kits rather than you having to piece it together yourself. https://www.ebay.co.uk/itm/Scheibenbremse-brake-kit-rear-axle-Bremse-Opel-Kadett-C-Manta-Ascona-A-B-cih-14-/285126800022?hash=item4262e1b296:g:9kQAAOSwBahVEVOk&pageci=3871fca5-216f-4f61-aa3c-86c005e5cdc2&redirect=mobile https://www.ebay.co.uk/itm/Scheibenbremse-Hinterachse-brake-rear-axle-Kadett-C-GTE-Manta-Ascona-A-B-cih-15-/285126800304?hash=item4262e1b3b0:g:oOsAAOSwqu9VCryv&pageci=0a45181e-a0dc-465b-b165-f073401d6c8c&redirect=mobile https://www.ebay.co.uk/itm/Scheibenbremse-280x22-hinten-disc-brake-rear-axle-Opel-Manta-Ascona-A-B-Rekord-E/285101487013?hash=item42615f73a5:g:N3oAAOSwNb9gHAGd&pageci=2a17c01b-ebea-4064-90cd-8111e9451367&redirect=mobile Discs are also easier to maintain vs drums(particularly so called self adjusting ones) and do look better The rear braking force will be limited by the brake bias valve so discs probably can’t do much more than the drums Edited February 10, 2023 by Moonmonkey Quote Link to comment Share on other sites More sharing options...
mantageek88 Posted February 11, 2023 Author Share Posted February 11, 2023 17 hours ago, Sutty2006 said: To be completely honest, you don’t really get much gain from rear disk kits unless you modify EVERYTHING else. I have Sierra Sapphire rear calipers using mk3 escort front disks and they pull the same force as the drums used to. I’ve not heard of any certification for disk kits sold in the uk. We don’t really know anything about the Croatian TUV test either Croatian tuv is simillar to German. Basically if the the car with the modification can pass in Germany it can pass here. I won't be taking the car to the track or anything but I was looking to switch because of the looks and the simpler maintnance also if it makes the car perform a little better it sure won't hurt! 17 hours ago, ®evo03 said: Valid point would be interesting to see the braking efficiency, but would have to be tested at optimum condition. Both drum and brake being in top condition, takes both a while to get in, or burn of the newness. I can't find that thread anymore, but I read somewhere on a forum, that you have to apply more force to drum brakes than disc brakes to achieve the same braking effect, so supposedly you're risking your rear tires locking up under braking. I don't know if this is true, so I wanted to check here first. Wouldn't want to risk my rear tires locking up. But I suppose since this swap is done a lot that it isn't unsafe😃 15 hours ago, Moonmonkey said: Don’t know about the TUV but there is this guy on German EBay does full kits rather than you having to piece it together yourself. https://www.ebay.co.uk/itm/Scheibenbremse-brake-kit-rear-axle-Bremse-Opel-Kadett-C-Manta-Ascona-A-B-cih-14-/285126800022?hash=item4262e1b296:g:9kQAAOSwBahVEVOk&pageci=3871fca5-216f-4f61-aa3c-86c005e5cdc2&redirect=mobile https://www.ebay.co.uk/itm/Scheibenbremse-Hinterachse-brake-rear-axle-Kadett-C-GTE-Manta-Ascona-A-B-cih-15-/285126800304?hash=item4262e1b3b0:g:oOsAAOSwqu9VCryv&pageci=0a45181e-a0dc-465b-b165-f073401d6c8c&redirect=mobile https://www.ebay.co.uk/itm/Scheibenbremse-280x22-hinten-disc-brake-rear-axle-Opel-Manta-Ascona-A-B-Rekord-E/285101487013?hash=item42615f73a5:g:N3oAAOSwNb9gHAGd&pageci=2a17c01b-ebea-4064-90cd-8111e9451367&redirect=mobile Discs are also easier to maintain vs drums(particularly so called self adjusting ones) and do look better The rear braking force will be limited by the brake bias valve so discs probably can’t do much more than the drum Thanks for the suggestion. This is awesome, and the price is good too! Quote Link to comment Share on other sites More sharing options...
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