Front brake replacement at 45K klm (28K miles)

Discussion in 'Gen 3 Prius Technical Discussion' started by vday, Jun 13, 2012.

  1. vday

    vday Member

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    I took the Prius if for it's 45K klm maintenance and was curious to hear if it sounds reasonable to need the front brakes replaced. Ther car seems to be braking fine but they said that it would last only another 1.5 K klm (1K miles). I do drive mostly in very hilly areas.
    My other car needs (driving in the same conditions) brake changes even more often.
    Previously I drove lighter and smaller manual cars and hardly ever needed the brakes changed.
    Thanks ;):confused:
    Danny
    BTW Other than that I have had zero issues so far (29 months on the road).
     
  2. PaJa

    PaJa Senior member

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    What exactly has to be replaced? Brake pads? Discs? 45kkm looks to be quite low odo. My car has almost 60kkm and pads and disc are as new ones (50/50 city/highway usage), but it depends on your braking technique. If you brake hard frequently, the regen braking is minimal and standard hydraulic system is deployed.
    Try to measure the pads and discs and post the result. You will need a micrometer to measure the brake disc. The pad lining thickness should be between 10-1mm and disc thickness between 25mm-22mm. When the thickness is less than minimum, parts have to replaced.
     
  3. markabele

    markabele owner of PiP, then Leaf, then Model 3

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    Try another brake guy and see what he says.
     
  4. retired4999

    retired4999 Prius driver since 2005

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    Lots of Prius drivers go 100,000 miles or more, but very hilly, heavy braking Maybe? I would check with another brake shop for a second opinion!
     
  5. vday

    vday Member

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    Thanks for the help
    It was just the pads
    It's too late as I had it done. It seems early but as I wrote previous car had a done after every 20-30K Klm.
    I don't break hard so that is what surprised me but changing elevation by 450 meters (1400 ft) every day takes its toll.
    Will do a more extensive check next time.
    ;)
     
  6. xs650

    xs650 Senior Member

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    Are you using "B" going down long hills?
     
  7. vday

    vday Member

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    Yes ALWAYS
     
  8. efusco

    efusco Moderator Emeritus
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    Something is clearly not right unless you routinely slam on the brakes or ride them or something. I'm at 125,000 miles and still have 50% of my original brakes and suspect it's just as hilly in the Ozark mountains as where you live.

    also, don't waste your time with B mode.
     
  9. markabele

    markabele owner of PiP, then Leaf, then Model 3

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    I simply think he got a dishonest mechanic.
     
  10. xliderider

    xliderider Senior Member

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    Why? B mode slows your car down, charges the HV battery, and you don't have to ride the brake pedal/modulate the brake pedal to stay in the regen braking zone as much.
     
  11. retired4999

    retired4999 Prius driver since 2005

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    I only use B mode when on steep grades and regular charging will not slow down the car enough, then B mode to help save brakes.
     
  12. 2k1Toaster

    2k1Toaster Brand New Prius Batteries

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    +1 on dishonest mechanic.

    I live on a mountain and have a 1200ft+ vertical drop every time I leave the house. 98K miles later, the brakes are barely worn. Living on the foothills of the Rocky Mountains, "flat ground" is rarer than a unicorn.
     
  13. retired4999

    retired4999 Prius driver since 2005

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    Agree with 2k1Toaster !
     
  14. efusco

    efusco Moderator Emeritus
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    There are many many threads on this topic and I don't want to derail this one. But unless it is a very long very steep hill and/or you just had using the brake pedal you accomplish the same thing, but more efficiently and you regen MORE than B-mode will b/c B-mode also forces the ICE to spin wasting some energy there. If you brake in D-mode all the braking regen goes to the battery.
     
  15. Mendel Leisk

    Mendel Leisk Underfoot

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    It's been a while since I've read the Owner's Manual regarding this, but I think Toyota's partially to blame, causing confusion with their brief descriptions. As far as I know, the only time B mode is beneficial is when you're on an extremely long down grade, where the battery has already charged as much as possible.

    Setting B mode reduces charging and increases engine braking.

    As a rule of thumb, I just resolve to never use it, has worked so far. ;)
     
  16. markabele

    markabele owner of PiP, then Leaf, then Model 3

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    ^^^ This is accurate. You only want to use B when you have filled up your pack and are willing to throw energy away. (that's the very short explanation anyway)
     
  17. mbartley

    mbartley Junior Member

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    How can we tell for sure when we've reached this point? When the battery display on the dashboard appears full, or is there a better way? I typically get the full battery display after about a 500' gradual descent on a drive I take frequently. I rarely use B on this.
     
  18. markabele

    markabele owner of PiP, then Leaf, then Model 3

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    Yep, it's not going to fill past that point. I'm sure the scanguage guys can speak more to exact number.
     
  19. wick1ert

    wick1ert Senior Member

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    I've used B mode in a few instances, and mostly to slow the car on a long downhill (mountain) stretch. I also use it going down a bridge that I need to exit at the bottom.

    - Mountain is in central PA, known to most as 7 Mountains. I believe it's about a 2-3 mile downhill (maybe more?) and parts are 8% grades. The HV battery gets filled up pretty quickly when you use regen at that point. B mode helps keep the car slow without having to use as much braking force.

    - The bridge is just as a means to slow the vehicle without using as much friction braking. I don't worry about the regen, because it's on the highway and won't make much difference during that 50+ mile drive.
     
  20. retired4999

    retired4999 Prius driver since 2005

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    Also when your battery is full the regen will stop and if still going down hill it will really pick-up speed fast with out regen thats when you will want to use B mode to help slow you up. I only use B mode when I am in the Rocky Mts. Or Glacier National Park something like that where you have 10-15 miles of down hill.
     
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