Stock Problems/Issues Discussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Clubman (R55), Cooper and Cooper S(R56), and Cabrio (R57).

How do you compress the brake piston???

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  #1  
Old 03-31-2018 | 10:20 AM
Cngizbleevng's Avatar
Cngizbleevng
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From: Boiling Springs, PA
How do you compress the brake piston???

I've changed out a number of brake pads over the last 10 years, but this Mini Cooper is something else.

I'm replacing the rotors and brake pads and I'm using a clamp to try to compress the piston to allow for more space for the pads. I've taken the cap off the brake fluid reservoir and siphoned off excess fluid.

I can't get the damn piston to retract into the housing. Applying about all the force I can with the C-clamp and it's not budging.

Anything I'm missing?
 
  #2  
Old 03-31-2018 | 10:46 AM
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Well, I just consulted the Haynes manual and it mentions a 'special tool' that allows the piston to be rotated clockwise while compressing it. What a load of crap!
 
  #3  
Old 03-31-2018 | 10:59 AM
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screw in rears are pretty common most cars with rear disks since the 80's. Its due to the parking brake mechanism. The alternative is to have a drum brake inside the hub, which you mostly see on trucks/suv's.
 
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  #4  
Old 03-31-2018 | 11:39 AM
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^Yep; the piston is a screw in type. you can rent the tool you need at most any of the chain auto parts stores. If you look at the face of the piston, you'll see two indents, those are what you "sit" the caliper tool in to twist and compress it.

If you don't have any nearby, you can twist it carefully with a set of pliers while you compress it with the clamp. If you choose to do this, just be really careful not to damage the piston; and try at your own risk...
 
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  #5  
Old 03-31-2018 | 11:45 AM
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From: Boiling Springs, PA
Originally Posted by Uber Commuter
If you don't have any nearby, you can twist it carefully with a set of pliers while you compress it with the clamp. If you choose to do this, just be really careful not to damage the piston; and try at your own risk...
Well, this is what I just did. Trying to compress the piston while rotating it wasn't easy, but I eventually got it. Now for the other side.
 
  #6  
Old 03-31-2018 | 11:54 AM
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ECSTuning (01-15-2024)
  #7  
Old 03-31-2018 | 12:17 PM
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  #8  
Old 03-31-2018 | 05:18 PM
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From: Boiling Springs, PA
Well, I was able to complete the job with a pair of slip-jaw plier and the C-clamp. Once I got a feel for it, it wasn't too bad.

Now to clear that pesky brake light on the dash.
 
  #9  
Old 03-31-2018 | 10:59 PM
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OOPS! My bad, excuse me for trying to support an actual MINI vendor.
 
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  #10  
Old 04-01-2018 | 04:22 PM
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I buy many products from ECS Tuning for 3 of my 4 cars (Mini, VW, BMW). But I don't pay them double the actual price of a product when there is no reason for it...

If you prefer to do that "because they are a MINI vendor" then feel free, it's your money.
 
  #11  
Old 04-01-2018 | 04:43 PM
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I bought one of these for my brake job.

https://www.harborfreight.com/disc-b...-pc-63264.html
 
  #12  
Old 04-02-2018 | 09:11 PM
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From: Potomac Maryland
Originally Posted by DneprDave
I bought one of these for my brake job.

https://www.harborfreight.com/disc-b...-pc-63264.html
That kit covers just about any caliper you will encounter... I have used mine often on many different cars I own.
 
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