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Thread: UK 4 Piston Brake refurb

  1. #1
    Me? Post? Never! Club Member mattdavies's Avatar
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    UK 4 Piston Brake refurb

    Thought I would start a thread on my brake calipers.

    I went on holiday for a couple of weeks so before this I thought it was a perfect opportunity to get my brakes refurbed while the car would not be needed. I took them off the car a couple of days before I left, packaged them up and sent to a refurbishment company.

    While I was on holiday I received and email from the company and they quoted 2x more then I was expecting to fix the calipers. I decided to have them sent back to me without any work being authorised.

    When they arrived they were stripped of all the parks and from what I can tell have been blasted. I have therefore made the decision to refurbish them myself. I have ordered some Foliatec Caliper paint, and also 8 x Genuine Brake Caliper Pistons ( 47731-14110 ).

    I will try to document the process as best as I can, I will be ordering some stainless steel pins and a seal kit from Chris Wilson shortly. Here are some pics:

    file.jpg
    1995 Silver BPU Auto - 1/4 Mile in 12.9secs @ 110mph

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    Me? Post? Never! Club Member mattdavies's Avatar
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    1995 Silver BPU Auto - 1/4 Mile in 12.9secs @ 110mph

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    I'm part of the furniture Club Member Dnk's Avatar
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    I posted about a problem i had doing UK spec calipers so thought i'd mention it

    When i shot blasted 2 sets of front calipers even though i washed through the fluid passage ways
    with brake cleaner followed by compressed air in both directions and repeated the process
    several times when i took one of the calipers apart i found shot blasting grit on the counter bore
    faces where the seals sit.

    I then took the others apart and they were the same

    I've added a photo, the grit i found was sat where the light blue arrows are which is where
    the seals sit.

    The seals aren't available from Toyota but CW could and possibly still can get them
    Attached Images Attached Images
    Last edited by Dnk; 02-03-18 at 14:06.
    Dunk

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    Me? Post? Never! Club Member mattdavies's Avatar
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    Thanks DNK, they are on the order list with the seal kit and stainless pins.

    The paint was meant to turn up today but might be after the weekend now. So will split them, clean them and paint them soon
    1995 Silver BPU Auto - 1/4 Mile in 12.9secs @ 110mph

  5. #5
    I'm part of the furniture Club Member Dnk's Avatar
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    No problem, i wasn't sure if you were going to split them or not hence me mentioning it.

    Also just as a bit of info the two halves are handed and marked up L and R so double check
    when you bolt them back together i didn't on my first pair until i'd fitted it back together
    Dunk

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    Me? Post? Never! Club Member mattdavies's Avatar
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    I wasn’t going to split them until Chris Wilson emailed me saying I should and he will sell me the seals. I thought I could feel him judging me via email so I have agreed to buy them LOL
    1995 Silver BPU Auto - 1/4 Mile in 12.9secs @ 110mph

  7. #7
    I'm part of the furniture Club Member Dnk's Avatar
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    Quote Originally Posted by mattdavies View Post
    I wasn’t going to split them until Chris Wilson emailed me saying I should and he will sell me the seals. I thought I could feel him judging me via email so I have agreed to buy them LOL
    LOL

    It'll be interesting to see if yours have any blasting media around the seals
    Dunk

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    vegetable sup Club Member mellonman's Avatar
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    Quote Originally Posted by mattdavies View Post
    I wasn’t going to split them until Chris Wilson emailed me saying I should and he will sell me the seals. I thought I could feel him judging me via email so I have agreed to buy them LOL
    Toyota told me directly ( steve manley ) not to split them
    the inside of your pots don't look right on one of them pictures looks to be flaking or something ?
    you have probably seen this but i will link it http://www.mkivsupra.net/vbb/showthr...ighlight=brake
    can see from my pictures but all my pots where completely smooth
    never under estimate stupid people in large numbers

    sorry i know i cant spell im distexic

    Hi stall is that some sort of chair ?

  9. #9
    I'm part of the furniture Club Member Dnk's Avatar
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    Toyota won't supply the small square section seals but CW can get them so other than that
    i see no problems in splitting them

    The calipers have a coating on the bores and inside faces so i'd imagine
    that's what's flaking off in Matts photo, they more than likely just need
    properly cleaning.

    The bore where the piston fits is a clearance fit to the piston the more
    critical part is the undercut where the piston seal fits
    Last edited by Dnk; 03-03-18 at 08:45.
    Dunk

  10. #10
    Me? Post? Never! Club Member mattdavies's Avatar
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    Quote Originally Posted by Dnk View Post
    The calipers have a coating on the bores and inside faces so i'd imagine that's what's flaking off in Matts photo, they more than likely just need properly cleaning.
    Do you think I should just wet and dry the bores with the coating ?
    1995 Silver BPU Auto - 1/4 Mile in 12.9secs @ 110mph

  11. #11
    I'm part of the furniture Club Member Dnk's Avatar
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    Quote Originally Posted by mattdavies View Post
    Do you think I should just wet and dry the bores with the coating ?
    Think i'd use some paint stripper to shift the coating

    After i'd media blasted the ones i did i used scotchbrite in the piston bores but they were completely clean
    and no coating on them
    Dunk

  12. #12
    Me? Post? Never! Club Member mattdavies's Avatar
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    The foliatec paint turned up today

    I decided to split them, they were done up very tight , I had to use a 1/2Ē ratchet to have enough leverage.

    Never the less here are a couple of pics




    1995 Silver BPU Auto - 1/4 Mile in 12.9secs @ 110mph

  13. #13
    Me? Post? Never! Club Member mattdavies's Avatar
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    Ordered the pistons Friday off eBay from the UAE, they arrived today

    There 8 of them I checked





    1995 Silver BPU Auto - 1/4 Mile in 12.9secs @ 110mph

  14. #14
    Me? Post? Never! Club Member mattdavies's Avatar
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    Prepped the half today and started painting. The paint gets good coverage basically as itís a little thin. Not sure how well they will come out. Cíest la vie the Wheels will hopefully hide all the paint defects




    1995 Silver BPU Auto - 1/4 Mile in 12.9secs @ 110mph

  15. #15
    Me? Post? Never! Club Member mattdavies's Avatar
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    Finished painting them the other night, I didnít realise that the paint was metallic so would of been better sprayed. Never the less I am hoping that it wonít be too noticeable once fitted and I have tried to keep the brush lines all the same.

    I am still waiting for my seal kit to turn up from Chris Wilson, havenít heard from him to say he has posted it or received the money.

    Here is a picture with the stickers applied




    1995 Silver BPU Auto - 1/4 Mile in 12.9secs @ 110mph

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