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Thread: How do ya push the pistons back in the 4 piston sumitomo's?

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    Forum User Not Verified Feedback Score 4 (100%) TUFFTR's Avatar
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    How do ya push the pistons back in the 4 piston sumitomo's?

    Never done this before....and I've just had the calipers painted....what tool is used to push the 4 pistons back? is there a tool which pushes them back from the middle outward? Just really don't wanna scratch the paint on the calipers

    Just haven't seen how to do it and even if someone can direct me to a link or another website with a how to or something that'd be tops.
    Thanks Lads.

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    Diamonds and Rust Feedback Score 1 (100%) gltasn's Avatar
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    theres a $10. tool for that at the help section of any auto parts store. or use a c clamp and a wood spacer.
    http://www.mytoolstore.com/kd/kdbrak07.html

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    I just bolt them on to the hub, loosen the bleeder screw and pry the caliper back with a long screwdriver. Make sure you have some type of hose/bottle connected to the bleeder screw to catch the brake fluid "it will eat your paint off" and only pry on the metal part of the piston. You don't want to damage the bust boot on the caliper. I've done it this way every time I have changed out the brake pads/rotors.

    Check it out on Youtube!!


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    Forum User verified Feedback Score 0 HLxDrummer's Avatar
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    I just cleaned the bores and outside of the piston REALLY well. Then put some new brake fluid on them and put them in one by one, making sure they go in straight. If it sticks, take it out, lube it up again/clean if needed. I wouldn't use any tools unless your CONFIDENT that it's going in straight and perfectly clean.

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    Twin Turbo verified Feedback Score 5 (100%) GTOJOE's Avatar
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    If you have loosened the bleeder valve and they are still hard to move then it's possible you need a rebuild kit. They should move quite easily when the valve is open. Alternatively if you can't find a rebuild kit disassemble then very carefully making sure not to damage any of the rubber. Get some very fine wet & dry paper and clean them up. Make sure both the piston and the caliper are perfectly smooth and re-assemble. However getting the pistons out can be a little hard sometimes.

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    Forum User Not Verified Feedback Score 4 (100%) TUFFTR's Avatar
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    I think I might invest in due time in a rebuild kit. I'm confident in rebuilding the calipers so I might just do that but appreciate the thoughts on how to push them back. Didnt get a chance to today but I'll try the long screwdriver trick tomorrow.

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    Australia verified Feedback Score 0 GTOX's Avatar
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    I used an old crappy c clamp to compress them back in, with an old brake pad against the pistons and a block of wood against the outer caliper protecting the paint from the clamp. Worked fine with the bleeder screw open.

    Similar to the method in this write up:
    http://www.supercar-engineering.com/...Pad/index.html
    Kangaroo

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    Sweet link! Ah so the G clamp will fit in there....
    Fark me dead thought it'd be too big.
    GAH I'll give that a shot..

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    Forum User Feedback Score 0 reallyxxxxxxloud's Avatar
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    I use a C clamp (vice grip brand) it works really well.
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    I use circlip pliers at work, push 2 pistons in at the same time. As has been said if you`ve got them off the car (no fluid inside) they should push back in with your fingers.
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