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Thread: CX5 GT Rear Calipers

  1. #1
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    2017 Mazda CX5 GT

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    Smile CX5 GT Rear Calipers

    Have 2017 CX5 GT AWD with 7000km and exposed to its first winter, recently swapped out my winter tires and their genuine Mazda steel Rims back to its alloys and "All seasons"; was shocked to see the level of oxidation on the rear calipers. Oddly the larger front calipers do not have this extreme oxidation. Has any other Canadian or northern state owners have similar experience and did you address with Mazda dealer? Thanks from Toronto!

  2. #2
    Underutilized Member shadonoz's Avatar
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    I wonder if this is one reason the rears often wear out faster than the fronts.

  3. #3
    Registered Member Paul-C's Avatar

    2015 CX-5 GT AWD w/Tech

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    Same area and just noticed this year how bad it looks but at 55,000km and nearly 4 years old - nothing yet replaced on the vehicle but brakes and OEM all seasons within next year I am thinking. I was just searching on what to do about it.

    For interest sake - I did purchase one of those dealer "got ya's" electronic rust-proofing doo hickey's. I ended up getting an extra $500 off the purchase price than expected and used it for this. I don't have rust anywhere else except here. Not really sure how well that is working - will know when it is 8-10 years old! Figure it saves me a trip each year for undercoating at $90 a pop.

  4. #4
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    I have heard about Mazda's issues with body rust and brake squeeling was told by Mazda dealer all been rsolved when I bought. But at 7000km, the rear brakes look brutal! It's obviously a reaction to road salt on what ever metal Mazda uses on the rear calipers vs the larger fronts. I have a 2007 Camry that look better. I do an annual oil rust proofing on all my vehicles and spray wash over the winters as well.

  5. #5
    Registered Member yrwei52's Avatar
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    Arrow CX5 GT Rear Calipers

    Can you post any pictures? I feel Mazda has been doing a poor job on rust-proofing for undercarriage area. Read this thread and you'll be the judge:

    Just joined the club and question on rust

    Rear brake calipers receive more slush of snow with salt from front tires and they should show more oxidation than front. The only way to make them not getting worse is to wash them more often if you can (if the temperature ever rises above freezing). And many Canadian CX-5 owners recommend rust-proofing when new:

    Rustproofing & Undercoating...is it necessary?

    Here is comparison pictures from Southern New Hampshire:
    Quote Originally Posted by Fish1 View Post
    Rust like that after a few years even with heavy use of salt I believe is unacceptable with today's coatings and materials to look worse than a car that is 13 years old is not acceptable. How can Mazda get away with this? I love how this car drives and looks but also want one that will last. Also very happy with fuel economy so far getting around 30.5MPG on my 100 mile round trip commute.

    2005 toyota matrix/pontiac vibe - 225K miles driving 100 miles a day

    Attachment 216618

    2014 CX-5 (seen 2 winters) -28K miles


    Attachment 216616
    Attachment 216617
    This CX-5 is from Illinois:
    Quote Originally Posted by gova View Post
    Just spent 3 hours under my 3 year old CX-5. Did AT, Engine and 2x TC oil changes.

    Rust level in various spots on 36 month car was tad too much. Mark this post, but in 4 season weather I don't see this version last 10 years.

    If this is CA/FL type of no salt climate - all should be fine, but winter states beware.
    This CX-5 is from Toronto area in Canada:
    Quote Originally Posted by jaman View Post




    Attachment 216610
    Attachment 216611
    Attachment 216612
    Attachment 216613

    Here is the underside of my car after 4 winters.

  6. #6
    Registered Member Anchorman's Avatar

    2018 CX-5 SportNav 2.2 diesel auto - Sonic Silver

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    The caliper body is made from a iron casting which gets a passivated finish to stop it corroding while new. It doesn’t last long nor does it take any harm. I painted my 2016 front ones at 12 months old just to tart them up, nothing more.





    Also tend to give my cars a good thick coating of under body wax..........


  7. #7
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    calipers

    Hope images of calipers attach to reply?
    Attached Images Attached Images

  8. #8
    Registered Member yrwei52's Avatar
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    Arrow CX5 GT Rear Calipers

    Quote Originally Posted by borish1234 View Post
    Hope images of calipers attach to reply?
    2017CX5BackCaliper.jpg

    2017CX5FrontCaliper.jpg
    Thanks for the photos. I guess not much you can do on this other than wash them as much as you can during winter, or apply some paint after cleaning up the oxidation.

  9. #9
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    CX-5 AWD, 2017

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    If rust is a problem in your area, spraying linseed oil under the body every 2 to 3 years may be a cheap and good solution. It is non toxic and easy to spray by yourself. There is a lot of information in the internet on its rust proofing effects.

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