Brakes - the good the bad the ugly

Discussion in 'Prime Care, Maintenance and Troubleshooting' started by vvillovv, Oct 13, 2020.

  1. vvillovv

    vvillovv Senior Member

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    To start with my brakes were ugly at 36k - read more in Gen4 main here 2018 Prius Brake problem 35K miles | Page 3 | PriusChat - I've since read all the posts in the thread and want to thank to members that posted before I did for all the technical data I've since used to compare with my experiences.

    I posted to the thread not knowing how ugly my front brakes had gotten. Being the thread was in the Gen4 section and I was posting a lot, I had second thoughts that I may be hijacking the OP's thread. So I'm starting this thread in the Prime section, to hopefully keep things here at PC cleaner.

    This older post in Calling a spade a spade on 2 Sept 2020 I believe is my first post referencing our Primes brakes. So I probably first noticed them in Aug as I didn't drive the car at all in May June or July and possibly March and April too.
    Calling a spade a spade | Page 2 | PriusChat

    My first post here is a general question concerning caliper slide pins. But before I ask about the pins I'd also like to include OE vs aftermarket components - caliper bracket anti-rattle clip reuse replace -- rotor wear, anything special to lookout for --- and hints to help the driver determine possible brake problems.

    Onto the caliper slide pins. My question is --
    Does the OE Glycol Soap grease actually make the bottom slide pin slide more easily?
    I'm certain it will make the upper pin slide easier, even if it's already been used on that pin during prior maint.
    And, the recommended caliper overhaul includes replacing the bottom slide pins rubber seal. Does everyone
    either reuse or replace that seal? And also, is it less important that the bottom slide pin actually slide freely with or without the seal, as opposed to it possibly being reused as the top slide pin? Thoughts!

    And finally does glycol soap look dark reddish almost jet black? and what happens when pad shim grease is used on the slide pins? Does the factory use glycol soap on the slide pins or is it called glycol soap for a different reason?

    edit: 07 sec youtube clip from "My Cousin Vinny"
     
    #1 vvillovv, Oct 13, 2020
    Last edited: Oct 13, 2020
  2. ChapmanF

    ChapmanF Senior Member

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    A grease is generally some kind of oil, thickened with some kind of glop; often the glop is chemically a soap.

    The Toyota 08887-01206 grease is a glycol-based oil, with a lithium soap used to thicken it.

    It is kind of a clear pinkish red out of the tube, with a smell a little bit like old basement.

    It is the specified grease for the slide pins and their boots, and for the piston and its boot and seal (in case you ever overhaul the caliper to that degree). If you buy the overhaul rubber kit (all the rubber parts and a few other miscellaneous bits to do two calipers), the kit includes a little packet of the red grease.

    If it looks dark black, it could be old and cooked, or darkened by rust, or somebody before you might have mixed it with a different grease. Grease mixing is usually not recommended. If that happened, the pins and bores can be cleaned out with a solvent and a rag or swab, so you can apply clean replacement unmixed grease.
     
  3. vvillovv

    vvillovv Senior Member

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    Thanks Chap - I've been researching which Toyota greases are which. I've been using light purple Permatex 24125 Ceramic Caliper Grease for a few years and used that when replacing the pins. Although the bottom pins with the rubber seals near the tips are still very tight and I'm going to recheck them.

    While searching around yesterday I stumbled upon the youtube channel Toyota Complete Maintenance, which address everything I asked about in my OP above


    the good
    after getting the new pads and rotors installed on the fronts the prime is rolling freely again much like - if not exactly like new again.
     
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  4. vvillovv

    vvillovv Senior Member

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    the bad
    dealer quote using value parts front pads and rotors at 500
    sounds close to 400 labor.
    That was the one that actually give a quote by phone. thanks
     
    #4 vvillovv, Oct 14, 2020
    Last edited: Oct 14, 2020
  5. Mendel Leisk

    Mendel Leisk Senior Member

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    NY (state?) is rust belt. Maybe get into bi-yearly brake service.
     
  6. vvillovv

    vvillovv Senior Member

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    at very least it's now got the right grease of the slide pins. I'm glad I was able to get to it before the snow flies.,,, Only 3 service items left and crossing my fingers I can get the car on a nice day or two and finish up the odds and ends.

    I haven't had to start maintenance on a car this early in the cars life other than oil change. But I'm really glad I caught it before it got worse.

    Bi Yearly sounds about right to me too.
     
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  7. vvillovv

    vvillovv Senior Member

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