# New rear rotor turning blue? **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** ford\ **Created:** [December 12, 2019, 11:24pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577 "2019-12-12T23:24:59Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![Ajkert](https://avatars.discourse-cdn.com/v4/letter/a/c57346/32.png) [@Ajkert](https://community.cartalk.com/u/Ajkert)\ **Post date:** [December 12, 2019, 11:24pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/1 "2019-12-12T23:24:59Z")
Just replaced my rear rotors/brake pads. Went with ceramic pads. Drove it and it all seemed fine. Got home and noticed one rear rotor turned blue near the base section where the studs are. Like a ring around the whole base, but not where the pads make contact. Is this normal or is something wrong? Any help would be much appreciated. I included a picture of what it looks like ![20191212_165022](https://global.discourse-cdn.com/cartalk/original/3X/4/2/421447ba7c768e6273b4f81d954f63c31e7470f2.jpeg) ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [December 12, 2019, 11:30pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/2 "2019-12-12T23:30:30Z")
The rotor got extremely hot. > **[Brake rotors are turning blue Inspection Service & Cost](https://www.yourmechanic.com/services/brake-rotors-are-turning-blue-inspection)** > > How much does Brake rotors are turning blue Inspection cost? Get an estimate instantly. Service, parts, cost & recommendations from YourMechanic. Your definitive guide to Brake rotors are turning blue Inspection. Tester ---
**Author:** ![Ajkert](https://avatars.discourse-cdn.com/v4/letter/a/c57346/32.png) [@Ajkert](https://community.cartalk.com/u/Ajkert)\ **Post date:** [December 12, 2019, 11:32pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/3 "2019-12-12T23:32:43Z")
Right I get that, but only one rotor did it. The other side looks completely normal. Could it be a faulty rotor? Or am I just missing something ---
**Author:** ![thegreendrag0n](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/thegreendrag0n/32/9265_2.png) [@thegreendrag0n](https://community.cartalk.com/u/thegreendrag0n)\ **Post date:** [December 12, 2019, 11:35pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/4 "2019-12-12T23:35:24Z")
drive a couple of miles not using brakes much, then park and CAREFULLY check wheel hubs first, then rotors for temperature if one is cold as stone and another one is hot, you have sticking caliper issue ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [December 12, 2019, 11:35pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/5 "2019-12-12T23:35:24Z")
Sticking caliper? Bad caliper hose? Tester ---
**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\ **Post date:** [December 12, 2019, 11:35pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/6 "2019-12-12T23:35:42Z")
Make sure the caliper isn’t sticking and the brakes dragging. ---
**Author:** ![Ajkert](https://avatars.discourse-cdn.com/v4/letter/a/c57346/32.png) [@Ajkert](https://community.cartalk.com/u/Ajkert)\ **Post date:** [December 12, 2019, 11:37pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/7 "2019-12-12T23:37:17Z")
Okay I popped off the caliper and tried moving the 2 slides. They do both seem to be somewhat sluggish when trying to move them back and forth. If that’s the case is it okay to use this rotor still? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [December 12, 2019, 11:38pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/8 "2019-12-12T23:38:53Z")
The metal was heat stressed. The rotor could crack in that area. Tester ---
**Author:** ![Ajkert](https://avatars.discourse-cdn.com/v4/letter/a/c57346/32.png) [@Ajkert](https://community.cartalk.com/u/Ajkert)\ **Post date:** [December 12, 2019, 11:42pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/9 "2019-12-12T23:42:18Z")
Just to cover everything how do I check the caliper hose? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [December 12, 2019, 11:46pm UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/10 "2019-12-12T23:46:33Z")
Pump the brake pedal few times and then open the bleeder screw for that caliper. If brake fluid shoots out the of bleeder, that caliper is still under hydraulic pressure even though the brake pedal isn’t being depressed. Tester ---
**Author:** ![Ajkert](https://avatars.discourse-cdn.com/v4/letter/a/c57346/32.png) [@Ajkert](https://community.cartalk.com/u/Ajkert)\ **Post date:** [December 13, 2019, 12:52am UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/11 "2019-12-13T00:52:44Z")
Just drove it around after greasing those pins, wasn’t near as hot so I think that was it! Thanks for the help ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [December 13, 2019, 1:15am UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/12 "2019-12-13T01:15:36Z")
> [@Ajkert](#): > > Like a ring around the whole base, but not where the pads make contact. Did you clean the protective coating from the rotor before installing it? It looks like the protective film turned purple from the heat. ---
**Author:** ![Ajkert](https://avatars.discourse-cdn.com/v4/letter/a/c57346/32.png) [@Ajkert](https://community.cartalk.com/u/Ajkert)\ **Post date:** [December 13, 2019, 1:37am UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/13 "2019-12-13T01:37:33Z")
I sprayed it with brake cleaner and wiped it down before the install, but that was it ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 13, 2019, 4:29am UTC](https://community.cartalk.com/t/new-rear-rotor-turning-blue/154577/14 "2019-12-13T04:29:19Z")
I think the recommended method is to clean the new rotor surface with hot water and soap and a scrub brush. But what you did was probably good enough. I don’t think that’s the cause for the blue rotor.