Question about 2008 Mini Cooper S

2 Answers

Break caliper pushed forward

I was replacing break rotors and just could not get one of the screws to loosen, so I asked my child to press breaks. I forgot I already took the breaks on one of the wheels and now the caliper is pressed all the way forward. I was trying to use a tool to press it back, like you would when you put new pads but it does not move back. What do I do? It's the front passenger wheel.

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  • Randall Nichols
    Randall Nichols May 14, 2014

    To move them back you have to screw them in unlike some calipers where you can press them back with a scissor clamp.

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Try opening the master cylinder to relieve the pressure in the lines. It won't hurt anything cus you have to bleed the line anyway or should. Hope this helps

Posted on May 12, 2014

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  • steve_n63630
    steve_n63630 May 12, 2014

    Where is the master cylinder? Should I bleed breaks? Haven't really done it.

  • desertracer May 12, 2014

    better yet loosen the bleeder valve on the back o fthe caliper

  • desertracer May 12, 2014

    I checked the caliper is really expensive at orillys auto prts but the caliper kit is only about $400. I would try to blow tht piston out of three with brake fluid pressure, and rinstyal the piston wih new seal.. be really careful with the piston.. don't brake it.. ..

  • steve_n63630
    steve_n63630 May 12, 2014

    I think the caliper is fine. I think there's a fluid that's pushing it. I think I need to reduce preasure first, push it back. Assemble the breaks and add new fluid. Sounds about right?

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You are talking about the piston being pushed out? #1. Put a piece of wood in the caliper and push the brake pedal again.. remove the piston all the way. clean the caliper bore, replace the seal(caliper rebuild kit usually really cheap) carefully reinstall the piston.. sounds like it is either "cocked and stuck or the caliper has a ring of rust at the top of the bore. either way clean and reinstall the piston. possibilty #2. Take a "C" Clamp and force the piston back in.. if you do this take an old pad and put it between the piston and clamp to protect the poston.

Posted on May 12, 2014

Testimonial: "I actually have a tool for pushing back the piston. I did it on the first wheel, but this seem to be too hard. In fact I can't turn the tool any more and the piston is still all the way in. At the beginning when I tried pushing it some of the break fluid dripped. I just don't want to make things worse. Shall I continue pushing. I don't see any rust. Everything looks quite clean."

  • 1 more comment 
  • steve_n63630
    steve_n63630 May 12, 2014

    Testimonial: "I actually have a tool for pushing back the piston. I did it on the first wheel, but this seem to be too hard. In fact I can't turn the tool any more and the piston is still all the way in. At the beginning when I tried pushing it some of the break fluid dripped. I just don't want to make things worse. Shall I continue pushing. I don't see any rust. Everything looks quite clean."

  • desertracer May 12, 2014

    Steve so what happened? When you let the brake pedal up there should be no more pressure on the caliper piston >> wHAT WAS THE FIX? BTW tHAT CALIPER REBUILD KIT WAS $4.00 not $400. Possibly 400 at the BMW dealer..

  • steve_n63630
    steve_n63630 May 14, 2014

    I opened the bleeder valve and was able to push the caliper back in.

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