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Thread: What size allen key for rear brakes?

  1. #1
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    What size allen key for rear brakes?

    I need to change the rear brake pads and rotors. Apparently I need a particular sized allen key. Anyone know the size?

    Thanks.

  2. #2
    2008.5 MGM MS3 rsvinylgraphics's Avatar
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    Well a quick google search I came across this and I skimmed thru it and saw mentioning of a 4.5mm allen key.

    But you really should get a set of allen keys just in case...

    http://www.thinkythings.org/p5/brakes.html

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    Quote Originally Posted by rsvinylgraphics View Post
    Well a quick google search I came across this and I skimmed thru it and saw mentioning of a 4.5mm allen key.

    But you really should get a set of allen keys just in case...

    http://www.thinkythings.org/p5/brakes.html
    4.5mm. Cool, thanks. You're right though, should get a set.
    *Edit. Seems like 4.5mm is an odd size.
    Last edited by Holiday; 12-07-2017 at 10:51 PM.

  4. #4
    The Diagram Dude pcb's Avatar

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    Walmart,.. $12
    and you might need the bottom set for the front brakes.. OEM uses hex but my aftermarket calipers use a socket..

    The Diagram Dude

  5. #5
    Registered Member o.g.sk8er's Avatar


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    The rear uses a 4mm for sure. I just did mine a few weeks ago

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    i don't pay attention i just start grabbing sockets until i find the one that fits lol. but i would recommend picking up a set of the socket style over the regular allen wrenches. you may not need it for this, but when you have to crack something loose that's torqued on there pretty good your fingers will thank you for using a ratchet instead of that thin pointy little piece of steel

  7. #7
    The Diagram Dude pcb's Avatar

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    Quote Originally Posted by pb4ugotobed View Post
    ... your fingers will thank you for using a ratchet instead of that thin pointy little piece of steel
    You could do this but when the handle slips off you'll take out a few knuckles.

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    Quote Originally Posted by pb4ugotobed View Post
    i don't pay attention i just start grabbing sockets until i find the one that fits lol. but i would recommend picking up a set of the socket style over the regular allen wrenches. you may not need it for this, but when you have to crack something loose that's torqued on there pretty good your fingers will thank you for using a ratchet instead of that thin pointy little piece of steel
    That, is a good idea. Is the reach very far? I haven't looked at it yet, it's to loosen the piston spring I believe, not sure how accessible. I just found out too I gotta make sure the emergency brake is set properly, I gotta friend who has some experience in changing rotors and brakes so hopefully it all gets set back properly.

  9. #9
    The Diagram Dude pcb's Avatar

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    Our rear brakes have an adjustment gear to retract the brake piston.

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    Registered Member o.g.sk8er's Avatar


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    Here are some pics of the access bolt for the adjustment gear. 14mm




    Bad pics but you get the idea.
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  11. #11
    The Diagram Dude pcb's Avatar

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    Quote Originally Posted by o.g.sk8er View Post
    Here are some pics of the access bolt for the adjustment gear. 14mm

    Bad pics but you get the idea.
    So what happened with your car ??
    Are you still stuck in the Target parking lot ??
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    Registered Member o.g.sk8er's Avatar


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    Haha no thankfully. I called AAA and seems to start when they jump it. Car is doing some odd stuff lately. Starts fine after I replace something, then dies again. Going to really go through some things tomorrow. I have to figure this out.
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    The Diagram Dude pcb's Avatar

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    Quote Originally Posted by o.g.sk8er View Post
    ...Going to really go through some things tomorrow. I have to figure this out.
    Start at the control wire of your starter motor.
    If you're always getting +12 V with key at start then it's the big solenoid.
    You can probably test for voltage from the back of the connector while it's plugged in.
    If your getting +12 V and your starter isn't going then it's your starter solenoid.
    There may be a be an extra bit of voltage from jump starting to get the big solenoid to kick in.

    The best thing would be to check for +12 V with the key at start but not turning over.

    Check your clutch switch with your ohmmeter.



    (maybe start a new thread in this section)
    Last edited by pcb; 12-09-2017 at 08:23 AM.
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    New issue. Right rear calipre has the hex adjuster (I can see where to insert the hex key) but when looking down the same hole on the left side calipre there is no hex adjuster at bottom of hole. All I see is a hole on the side near bottom of the hole. Not sure why this is the case.

  15. #15
    The Diagram Dude pcb's Avatar

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    You lost your adjuster for the left side.
    You can use the adjuster from the right to adjust it.
    Just pull it out with a magnet.

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