Changing brake pads on WRX
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This is a discussion on Changing brake pads on WRX within the Maintenance, service, and repair forums, part of the Tutorials & DIY category; My front brake pads finally gave up the ghost this last week at ~18,000 miles. While I was changing them, ...

  1. #1
    Registered User pace's Avatar
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    Changing brake pads

    My front brake pads finally gave up the ghost this last week at ~18,000 miles. While I was changing them, I noticed that the pads are retained a little differently than all the other vehicles I have worked on. Henceforth, it seemed like it might be worthwhile for me to document the procedure...

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  3. #2
    Registered User pace's Avatar
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    1.

    First, loosen your lug nuts for the corner you are working on, jack the vehicle up and put it on a jack stand, then remove the wheel.
    Attached Thumbnails Attached Thumbnails p6290076.jpg  

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    Registered User pace's Avatar
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    2.

    You now need to dislocate the caliper. There are two 14mm bolts that need to be removed: A lower one, and an upper one. Once removed you can wiggle the caliper back off the rotor, and lay it up on top of the rotor next to the strut.

    At this point, DO NOT let anyone touch the brake pedal.
    Attached Thumbnails Attached Thumbnails p6290077.jpg  
    Last edited by pace; 06-30-2002 at 11:18 PM.

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    2. (cont)

    Here is the lower retaining bolt location.
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    2. (cont)

    Here is the caliper dislocated.
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  7. #6
    Registered User pace's Avatar
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    3.

    At this point you can pull the pads free. I just carefully wedged my finger between the rotor and the pad to lever them free. They locate/remove in a manner perpendicular to the axis of the rotor. There are two of them on each side; remove them both.

    You will note that the inside pad has a metal 'clip' attached to it. The purpose of this is actually to rub against the rotor when the pad material is getting worn low; thus creating the horrid metallic squeal that will remind you your brakes need attention.
    Attached Thumbnails Attached Thumbnails p6290080.jpg  

  8. #7
    Registered User pace's Avatar
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    4.

    Organize the new parts. There are two pads, each with one plastic-coated plate, and one shiny metallic plate, and one metal clip. Subaru also provide some brake grease for you.
    Attached Thumbnails Attached Thumbnails p6290082.jpg  

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    5.

    Remove the old clips by just dislodging them with your fingers.
    Attached Thumbnails Attached Thumbnails p6290083.jpg  

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    6.

    Grease the new clips on the surface that mates to the caliper mount, and locate them in their respective positions. The two clips are identical and interchangeable.
    Attached Thumbnails Attached Thumbnails p6290084.jpg  

  11. #10
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    6. (cont)

    The new clips located in position.
    Attached Thumbnails Attached Thumbnails p6290085.jpg  

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    Registered User pace's Avatar
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    7.

    Liberally grease the back of each brake pad. Be very careful not to get grease on any braking surface. Once greased, clip the plastic-backed plate into place on the back of the pad. Put a smear of grease across the center of this plate, then clip the shiny plate into place over the plastic-coated plate.
    Attached Thumbnails Attached Thumbnails p6290087.jpg  

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    7. (cont)

    The black plastic-coated plate clipped onto the pad.
    Attached Thumbnails Attached Thumbnails p6290088.jpg  
    Last edited by pace; 06-30-2002 at 11:21 PM.

  14. #13
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    7. (cont)

    The shiny plate clipped over the black plastic-coated plate.
    Attached Thumbnails Attached Thumbnails p6290089.jpg  

  15. #14
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    8.

    Now locate the two fully-assembled pads into their respective positions, making sure they are held securely in place by the two retaining clips. Again be careful not to get grease on any of the braking surfaces.
    Attached Thumbnails Attached Thumbnails p6290090.jpg  

  16. #15
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    9.

    It is now time to replace the caliper. If your old pads were badly worn as mine were, you will now notice that the caliper pistons are too far extended to allow you to relocate the caliper.

    At this point, remove the cap from the brake reservoir. Now you are going to depress both pistons. To do this I used the lug wrench lain across the two pistons, and pushed on it with both hands. I made a rocking motion from one piston to the other until eventually they were both fully depressed. You can brace the caliper against the strut so that you can get a decent amount of force onto the caliper. While you are doing this, it is important to periodically check the level of the brake fluid in the cylinder. Brake fluid is extremely corrosive and is the best paint remover there is - you don't wan't it splashed around in your engine bay.

    If you cannot get the pistons depressed, you will need to release pressure (and fluid) from the system by opening the caliper bleed screw (with a hose attached and appropriate catch can ready). This will allow you to easily depress both pistons, BUT will absolutely necessitate a bleed of the brake system afterward. You may also have to follow this procedure if depressing the pistons causes the reservoir fluid level to get too high and you do not feel comfortable trying to soak up the excess with a paper towel (CARE NOT TO DRIP BRAKE FLUID ON THE PAINTWORK).

    Once the pistons are fully depressed, relocate the caliper and replace the two bolts.
    Attached Thumbnails Attached Thumbnails p6290091.jpg  
    Last edited by pace; 06-30-2002 at 11:24 PM.

  17. #16
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    10.

    Well done. You are home and dry. Replace the tire, and lower the vehicle from the jack stand. Torque the lug nuts to the specified values.

    Repeat for the other side (do one side at a time).

    -Pace
    Attached Thumbnails Attached Thumbnails p6290092.jpg  

  18. #17
    Registered User Nexus6's Avatar
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    Red face

    Thats it?
    La Fee Verte
    Subaru 2002 Impreza WRX Sedan

  19. #18
    Registered User pace's Avatar
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    Originally posted by Nexus6
    Thats it?
    Meaning?

  20. #19
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    Thumbs up

    ...awesome illustrations and instructions!

    -- Rich

  21. #20
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    Pace,

    Why didn't you get your rotors resurfaced?

    -Jim

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