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Photo or Diagram for rear emergency brake shoes with EU rear disc brakes?

Discussion in 'Gen 2 Prius Main Forum' started by PolarBear, Apr 7, 2018.

  1. PolarBear

    PolarBear Junior Member

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    I am replacing the rear brakes on my EU 2008 with rear disc brakes. I took photos of the emergency brake shoes and parts before taking them apart but the one diagram I can find shows the springs at the top the other way and the metal spacer (47613 in photo) at top between the brakes shoes with the hole in at the other way.

    Does anyone have a better digram or clear photos to confirm the parts are the right way?
     

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  2. valde3

    valde3 Senior Member

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    Looking at the pictures from mine and drawing some conclusions:

    They probably only make one type of top front spring 46550G. So (top of it) is hooked from the top one side and bottom from another.

    Rear top spring 46550A is hooked (on bough sides) from top (as in the diagram) which means that you need different spring on different sides.

    47613E or 47614 is drawn wrong on the diagram anyways. You shouldn’t be able to properly fit it the wrong way as one side has narrow slot where front brake shoe fits. Another side as has wide slot where rear shoe and leaver (that the cable is attaches to) fit. Outsides of the slots are in line. But I think the hole that you talk about is where hook of rear top spring (46550A) goes into.
     
    #2 valde3, Apr 8, 2018
    Last edited: Apr 8, 2018
  3. PolarBear

    PolarBear Junior Member

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    Thanks, that was helpful. I got some photos I can post later. Does the spring turn the star adjuster at the bottom? Are they self adjusting or do you have to pull the wheels and adjust the star adjuster through the hole in the rotor as they wear? I got them back together and the parking brake is working fine.
     
  4. valde3

    valde3 Senior Member

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    There’s no automatic adjuster. Just turn the adjuster tight (though the hole in the brake disc+drum) after assembling and then turn it down enough that wheel rotates freely. Wear on the parking brake shows is minimal so you shouldn’t need to adjust it for a long time.
     
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  5. PolarBear

    PolarBear Junior Member

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    The first set of rear brake pads were the wrong ones so I got some new NK pads and the the caliper when lowered hits the outside pad. Seem it is the same on both sides. The pad is about 1mm or more too thick. The caliper is open all the way and there is plenty of room on the inside pad. I am cautious to just sand down one pad. What should I check?
     
  6. valde3

    valde3 Senior Member

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    Sorry but I’m not sure if I understand the problem. Could you explain a bit more? But no matter what you should never have to sand/grind the pads.

    If there’s extra room for one pad and not enough room for another you should just push the caliper sideway on the sliders to get more room for the pad that does not fit.


    First of all which brake calipers you have? There are two types:

    First type:

    Not very good instruction video as they don’t clean or lubricate anything and let the caliber hang from the hose.

    For second type Akebono I could not find a instructuons for a Prius but this is the exact same setup on some Corollas, RAV4s or Celicas.
    Front and rear brake pad change - Workshop Submissions - Toyota Owners Club - Australia
    But again it doesn’t show how to clean or lubricate anything. You can probably find a lot better guide somewhere.

    Did you put the brakes in service mode by Brake service or disconnecting the 12V battery?
     
    #6 valde3, Apr 10, 2018
    Last edited: Apr 10, 2018
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  7. Mendel Leisk

    Mendel Leisk Senior Member

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    Our daughter's Pilot has similar rear brake setup: disc brake with a small incorporated drum brake. Interesting, I guess the drum brake should last the life of the vehicle, since it's only used for parking function. Funny thing, drum brakes, even when they're THE rear brake, seem to last pretty much forever. Our son's 06 Civic has 240K kms, rear drum brakes still fine last time I checked. It was getting to be a bear getting the drum off though, due to rust on the hub. I check shoe thickness, drum inside diameter, lube the shoe contact points with backing plate, done.
     
  8. PolarBear

    PolarBear Junior Member

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    They are the first type in that video. :eek: That is the problem they are not sliding since they are so rusted. Don't think they were lubed and sliding when the brakes were changed last. The inner pad was worn twice as much is the outside pad. Guess I will pull them again and try and get them sliding. I didn't see how to pull the two pieces apart where it rotates on the one side to open it to put the pads inside.
     
  9. Mendel Leisk

    Mendel Leisk Senior Member

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    I'm not sure what you mean, when you say "rotates". There's two bolts holding the caliper on, they go through ears on the caliper, into threaded holes in the caliper pins. Remove one of those bolts, say the lower one, and you can only rotate the caliper up and off the pads, pivoting on the upper caliper pin. Remove both bolts though, and then you can lift the caliper clear of the rotor, and you'll be able to pull both caliper pins out the holes their in, in the caliper mounting bracket. Clean and relube (say with SilGlyde Brake Lubricant), and they'll slide like new.

    Am I helping, or completely off-base, not sure?
     
  10. valde3

    valde3 Senior Member

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    If you can get it rotated then you should be able to get it out. Just check that it’s actually rotating and not just unscrewing from the caliper. If it’s unscrewing from the caliper use something like pliers (and penetrating fluid) to get it turning and tighten it to caliper. Once you get it turning put more penetrating fluid on it and tap it with hammer and/or use pry bar to force it out. Once you get the slider out clean the hole with brake cleaner and use silicon brake lubricant to lubricate it when putting it back together.

    If you want to help watch the video carefully. One of those sliding pins is not connected to caliper by bolt it just threads into the caliper that’s why it’s not removed in the video.
     
  11. Mendel Leisk

    Mendel Leisk Senior Member

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    Ok, I see. Around 2:40. Sorry.
     
  12. PolarBear

    PolarBear Junior Member

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    This is all starting to make more sense. :) The sliding bolt was threading out of the mounting piece or tightening on the other. The caliper and sliding bolt are rusted together very hard. That is why the calipers were both so hard to rotate from the mounting piece to pull the pads. I pulled the boot back around the sliding bolt and they are both corroded really bad. I sprayed a lot of rust penetrating fluid and will let them soak but and wondering if they are a lost cause. So the mounting piece should just slide completely out of the hole in the caliper on that end? I put a piece of wood and tapped on them and they didn't even budge.

    I will try again to pull the two pieces apart but the question now is at what point is the rust so bad on the calipers that I just buy new ones?
     
  13. Mendel Leisk

    Mendel Leisk Senior Member

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    You might be there? :(

    Or, if you manage to get everything apart, chase the caliper pin holes with something like a brass bristle brush, who knows. I still don't understand that upper connection that well, should bow out.

    Where's "North" btw?
     
  14. PolarBear

    PolarBear Junior Member

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    The big hammer always wins! :) I got the pieces apart with some heat and the hammer.

    I am debating on if I should change the calipers. Hopefully the heat from the torch around the bolt didn't damage the seals. I am sure they can take some heat. Either way I had to remove the mounting piece.

    I will replace the rubber boots and both slide bolts and get some grease.

    Any good reason I shouldn't just try to reuse the calipers? They were not leaking before so unless the heat damaged a seal they should work fine even though they are rusted bad.

    You can see in the photos I painted them after a rough use of the wire wheel on a drill. The paint I used came off pretty easily already in places I hit.
     

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  15. PolarBear

    PolarBear Junior Member

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    Guess you can't delete a post.
     
  16. valde3

    valde3 Senior Member

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    What did you use to heat it up? With butane torch seals should be fine as the heating was concentrated to area where the slider was. If you used oxy-acetylene then it depends on how you heated it. If the seals did get damaged you can just replace them rather than entire caliper.

    When putting it back together use silicon brake caliper grease and not something like wheel bearing grease. Normal grease will destroy the rubbers and then slider can seize and grease can ruin the brake pads.
     
  17. Mendel Leisk

    Mendel Leisk Senior Member

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    Sil-Glyde brake lubricant is one readily available pin lube.
     
  18. PolarBear

    PolarBear Junior Member

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    I used a small butane torch on a can.

    I will get some of this for the pins since it is safe with the rubber:


    Jarrusylinterirasva - Biltema


    Can I use a little of this behind the parking brake shoes and on the threads for the star adjuster or something else?
     
  19. valde3

    valde3 Senior Member

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    That’s not a best product for that use. It’s really designed for the brake caliber (or brake cylinder) seals.

    From Biltema this is a lot better product:
    Jarrusatularasva - Jarru Auto Turvallisuus - Biltema

    You can use that on all the sliding points of drum brakes and on the adjuster threads. Also on the sliding pins of disc brakes and the sliding points where the edged of brake pads slide. Just don’t put it on friction surfaces.
     
    #19 valde3, Apr 11, 2018
    Last edited: Apr 11, 2018
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  20. PolarBear

    PolarBear Junior Member

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    Great, I will get some of that. Thanks