Question about 2002 Mazda Protege

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2003 mazda protege 5,changing brake pads caliper piston will not go back

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Mazda protege5 rear caliper pistons will not go back by pressure...there is a screw in the back (take off on of the nuts, and turn it clockwise until it's loose. if it doesnt retract the piston while doing it, then turn clockwise a few times and push it in via the other solutions.

Posted on Jan 10, 2011

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You will need to remove the brake line from the caliper, if the caliper will go back then you could possibly have a bad brake line. Also, you should open the reservoir when pushing the caliper back to allow the pressure to release. If the caliper does not go back, then you will need to either rebuild or replace the caliper.

Posted on Jul 12, 2009

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If the caliper won't go back initially try this much easier solution prior to re-building/replacing, or 'bleeding the line' (releasing the pressure), and replacing the lines. All of the above could still be the problem, however this is much simpler and less time consuming.

1. Take an flat piece of something that is rigid enough to apply pressure to (small piece of ply-wood, old brake pad, etc) make sure that it's flat-ish and won't squish, crush, or snap when pressure is applied to the middle of it.

Place this piece of material on the inside of the caliper over top of the piston (round hollow bowl with rubber seal on it - its on the big end of the caliper can't miss it)

2. Once you have the piece of material find a Channel-lock Wrench, or 'C' Clamp. Make sure whichever you use is large enough to fit over the back of the caliper piston (where the brake line goes in) and the *middle* of the piece of material you're using. You want to apply even pressure to the piston or you could potentially damage the piston and have to replace the caliper.

Apply the pressure, this will push the piston back into the housing, continue until the piston is fully retracted.

Now you can put the caliper back on and reassemble your brakes.


Get in your car when you are done, PUMP THE BRAKES until you can no longer pump them, this builds the pressure back in the lines (more required if you bleed the lines) In-fact it is a MUST DO if you bleed the lines. Then turn your car on and pump the brakes, you should feel the resistance about mid-pump. If you are able to push the peddle to the floor with little resistance you have an issue with your caliper piston and likely need to replace/rebuild it.

However, this solution albeit long winded is simple and takes less than 5 mins to accomplish follow the instructions carefully and you'll be fine.

Best of Luck

Posted on Aug 15, 2010

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There is a thin head bolt on the back.
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Clean averything well and grease the slide pins with a good quality waterproof grease. There is special grease for slide pins.
Greg 248-219-5821

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