brake pad smell, lower mpg ?

Discussion in 'Gen 3 Prius Main Forum' started by Alain D, Mar 28, 2022.

  1. Alain D

    Alain D Junior Member

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    2014 with 185k (previous owner uber car). last weekend drove up to Tahoe (5h drive 7k passes) and got only 37mpg going up (instead of 42+), but got normal 50mpg coming back. During the 8+ drives there, I managed to smell brake pads 3 times when I stopped including when driving up the mountain - so clearly some brake drag.... but went outside and never could smell what wheel it was. Yesterday drove RT to Berkeley (1.5h each) and got similar 42 and 49mph when they should be the same... but no smell. something is affecting my mileage.

    I now carry a heat gun to see what wheel might be occasionally dragging, but have not found the issue...

    I did a brake bleed/flush about a year ago (not very dirty) and as far as I know pads have never been changed (185k) but I recall seeing plenty left (have to look again).

    as far as I know the brake pin have never been re-lubed - could this be the issue ?
     
  2. bisco

    bisco cookie crumbler

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    it's possible, but you should certainly jack her up and see if all the wheels spin freely, then pull them and inspect the brakes thoroughly, and lube the pins.
    some say you can feel a hot wheel by hand after a good drive, idk.
     
  3. JC91006

    JC91006 Senior Member

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    Well you can try and remove all the wheels and look at the brake pads. If any of them look more worn, there will be your answer. I mean, you're due for a brake inspection right?
     
  4. KamiKKazi

    KamiKKazi New Member

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    Have you cleaned the EGR yet? If not I would recommend that. Maybe clean MAF sensor.
     
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  5. ChapmanF

    ChapmanF Senior Member

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    Sometimes you need a more sensitive test to identify some less-obvious drag. There's such a test described here.
     
  6. Mendel Leisk

    Mendel Leisk Underfoot

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    Good idea for the rears. With the fronts you can't do that though, due to linkage to the transaxle and so on. But yeah check the rears. More info in my signature.
     
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