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Thread: Darn Caliper Pistons D2

  1. 6th August 2014, 05:33 PM #1
    Ralph1Malph's Avatar
    Ralph1Malph
    Ralph1Malph is offline OldBushie
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    Darn Caliper Pistons D2

    I have a rogue piston in my D2 front caliper!
    I was trying to retract them using a g clamp to refit new pads. The first one didn't move so I moved onto the second. It moved easily after a bit of pressure, but that initial pressure caused the first piston to pop nearly all the way out.
    Now I can't get it any further out nor any further in with the clamp.
    I am unsure whether it has moved forward of the seal but I don't suspect so as it would be able to be removed wouldn't it?

    The rubber boots are in reasonable nick and the piston seems to be good as well, not scored or scuffed so I hoping to salvage the piston and seals.

    Any ways, do I have at it with the 60t press? I have removed the caliper from the car and thought bugger it - it just has to go back in.

    To press or not to press?

    Ralph
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  2. 6th August 2014, 08:22 PM #2
    bee utey's Avatar
    bee utey
    bee utey is offline AT REST
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    The piston has probably tilted a bit and is sticking at the edge of the seal groove. Tap it inwards with a punch and hammer working gently around the cup until it moves.
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  3. 7th August 2014, 10:15 AM #3
    mattg Guest
    If you have it off I would get a genuine seal kit and replace the seals. I had a dud batch of seals from Britpart. DONT USE BRITPART. There was a 1.5mm difference in the thickness of the seals if the boot is in reasonable condition it may have been rebuilt with uneven seals.
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  4. 8th August 2014, 05:07 PM #4
    Pedro_The_Swift's Avatar
    Pedro_The_Swift
    Pedro_The_Swift is offline The MOD Father
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    This happened on my D1 and I was informed (on here) to turn/twist it,, worked a charm,,,
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!

    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]
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  5. 8th August 2014, 05:55 PM #5
    Ralph1Malph's Avatar
    Ralph1Malph
    Ralph1Malph is offline OldBushie
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    Well, In the end it wasn't hard, but boy it made me work for it!

    Secured the caliper in a vice and started to tease the piston in.
    For the first 10 minutes nothing........no amount of angle or pressure would budge it and seat it home.

    I removed the piston and lubricated the chamber, seal and piston...still no luck.

    Then as if by magic, when I was about to get cranky, it just popped. No aides, force or persuading. It just seated and slide down.

    Worried about the seal, I pressurised the caliper, both with brake fluid and air and no leaks so on the car it went.

    Ten minutes later, bleed done, I am mobile again.

    Cheers
    Ralph
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  6. 11th August 2014, 02:29 PM #6
    mattg Guest
    AlwAys good to have a win
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