VersaTuner - tuning software for Mazdas
VersaTuner - tuning software for Mazdas
Results 1 to 4 of 4

Thread: Rear Caliper Adjustment Screw Allen Key Size?

  1. #1
    Registered Member

    2002 Mazda Protege5

    Join Date
    Dec 2013
    Location
    Bowling Green, KY
    Posts
    69

    Red face Rear Caliper Adjustment Screw Allen Key Size?

    Hey Gang,

    What size Allen key should I use to turn the adjustment screw on the rear calipers? Feeling pretty defeated after I spent almost 2 hours replacing the pads and rotor on one wheel only to basically feel like I stripped the adjustment screw. I had undo everything and install the old pads/rotors for the time being. I was using a 4 MM Allen Key and it keeps skipping/slipping when I try to turn the adjustment screw. If I try to insert a 5 MM Allen key then it wont fit at all. Do I need to purchase a 4.5 MM Allen Key?

  2. #2
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

    Join Date
    Jun 2011
    Location
    ontario, canada
    Posts
    4,440
    It's a 4 mm.
    I just checked my rear caliper from my parts car (it's disconnected from the car).

    I played with it for a bit and realized that turning the adjustment screw doesn't pull the piston in.
    You still have to push on the piston after turning the screw. The adjuster just adjusts the stopping point of the piston.
    Try backing off the adjuster a bunch of turns then push in the piston.

    Sometimes the whole mechanism is messed up and doesn't work but, you can also rotate your entire piston and screw it back in.
    If you try to screw in your piston, make sure your piston boot is free to rotate and not stuck on the piston or it will rip.
    The Diagram Dude

  3. #3
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

    Join Date
    Jun 2011
    Location
    ontario, canada
    Posts
    4,440
    The adjustment screw just floats in the hole, you can pull it out with a magnet and see if the teeth look stripped.

    Sigs are visible only in your first post on a page. To change your thread display preferences, click here and enable 'Always Show Signature'.

  4. #4
    The Diagram Dude pcb's Avatar

    2002 mazda protege 5

    Join Date
    Jun 2011
    Location
    ontario, canada
    Posts
    4,440
    I took my rear caliper apart to try to figure out how it works. (I still don't really get how it works??)

    Photobucket took all my pictures so I reposted some pics at the end.

    https://www.mazdas247.com/forum/show...ion&highlight=
    Sigs are visible only in your first post on a page. To change your thread display preferences, click here and enable 'Always Show Signature'.

Similar Threads

  1. plug bolt size for rear caliper adjustment screw
    By BlueBomber in forum Protege5
    Replies: 2
    Last Post: 11-22-2015, 03:40 AM
  2. Rear Caliper Allen bolt stripped.....Need help asap
    By 02protege5wagon in forum Protege5
    Replies: 13
    Last Post: 03-25-2014, 06:16 PM
  3. Quick question, allen bolt size for caliper
    By cutchemist in forum Protege5
    Replies: 5
    Last Post: 06-19-2013, 05:20 PM
  4. Allen screw on rear caliper stripped. What to do?
    By redbaron112358 in forum Protege5
    Replies: 31
    Last Post: 11-07-2011, 04:06 AM
  5. Rear Caliper Allen Bolt is Stripped
    By dnale in forum Mazda Protege
    Replies: 0
    Last Post: 09-18-2006, 02:54 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •