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The Terminator
Terminator Talk
Installing ATS Brembos on the Cobra.
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<blockquote data-quote="Blkkbgt" data-source="post: 16981868" data-attributes="member: 117234"><p>I think I've found the cause of the leaking rear calipers people have been complaining about. </p><p></p><p>I think there is a bad run of seals or a company making the incorrect size and those are being sold to rebuilders. </p><p></p><p>While rebuilding my 38mm calipers I ran into a small issue where one of the pistons would not screw back in. I fought it for way to long.</p><p></p><p>I originally bought a Dorman rebuild kit because it was in stock. All the kits look the same and I thought they were probably all made in the same Chinese factory. WRONG!</p><p></p><p>I ended up buying a second rebuild kit from Centric. The piston seal that comes in this kit is far better. By better I mean tighter around the piston.</p><p></p><p>Here you can see the Dorman seal just sitting on the piston. This seal was never tight on the piston.</p><p></p><p>[ATTACH=full]1818897[/ATTACH]</p><p></p><p>This is that same seal pulled to one side.</p><p></p><p>[ATTACH=full]1818898[/ATTACH]</p><p></p><p>Here is the Centric seal. This seal fits great with zero gap.</p><p></p><p>[ATTACH=full]1818899[/ATTACH]</p><p></p><p>When pulling the pistons out I noticed a lot of seal material on the pistons, in the caliper groove and on the seals themselves. This tells me those seals were rotating in the bore when I was screwing the pistons back in. Below you can see the material that came off the Dorman seal and out of the groove.</p><p></p><p>[ATTACH=full]1818900[/ATTACH]</p><p></p><p>[ATTACH=full]1818901[/ATTACH]</p><p></p><p>Hopefully this helps someone.</p></blockquote><p></p>
[QUOTE="Blkkbgt, post: 16981868, member: 117234"] I think I've found the cause of the leaking rear calipers people have been complaining about. I think there is a bad run of seals or a company making the incorrect size and those are being sold to rebuilders. While rebuilding my 38mm calipers I ran into a small issue where one of the pistons would not screw back in. I fought it for way to long. I originally bought a Dorman rebuild kit because it was in stock. All the kits look the same and I thought they were probably all made in the same Chinese factory. WRONG! I ended up buying a second rebuild kit from Centric. The piston seal that comes in this kit is far better. By better I mean tighter around the piston. Here you can see the Dorman seal just sitting on the piston. This seal was never tight on the piston. [ATTACH type="full" alt="20231127_132243.jpg"]1818897[/ATTACH] This is that same seal pulled to one side. [ATTACH type="full" alt="20231127_132340.jpg"]1818898[/ATTACH] Here is the Centric seal. This seal fits great with zero gap. [ATTACH type="full" alt="20231127_132501.jpg"]1818899[/ATTACH] When pulling the pistons out I noticed a lot of seal material on the pistons, in the caliper groove and on the seals themselves. This tells me those seals were rotating in the bore when I was screwing the pistons back in. Below you can see the material that came off the Dorman seal and out of the groove. [ATTACH type="full" alt="20231127_131902.jpg"]1818900[/ATTACH] [ATTACH type="full" alt="20231127_132652.jpg"]1818901[/ATTACH] Hopefully this helps someone. [/QUOTE]
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Installing ATS Brembos on the Cobra.
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