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2002 GMC Sonoma Question: How do I get brake piston to depress to change brake pads?

 

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trey3333, 2.2L 4 Cylinder, Murrieta, CA, January 26, 2014, 17:58
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Im trying to change brake pads but can't get the brake cylinder to depress so I can fit the new pads. Everything I've seen says use a c-clamp. I did and it won't budge.

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  • Answer #1

    pushrod January 26, 2014, 18:14
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    Try the other side, if it does ok then replace that caliper you are working with now. If you have the same trouble on the other side as well, get some hands-on help for this brake job!

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    trey3333, January 26, 2014, 19:56
     Rookie

    Tried the other side still not budging even opened the bleeder a little bit.

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    pushrod, January 26, 2014, 22:31
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    Wrong tool being used OR wrong technique. Get someone to help you out here! If both calipers were stuck that bad either the pads were worn completely out and so were the rotors or the truck would not have moved as the brakes were locked up and the calipers would have to been pried off with a pry bar. Tell the whole story!

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    trey3333, January 26, 2014, 23:12
     Rookie

    It is the whole story, but it could possibly be wrong tools. I used squeeze c-clamps the kind with the trigger might not be getting enough force, but I also tried a large pair of channel locks no budge. I'm going tomorrow to get a set of screw tight c-clamps see if they will do better. The pads were very warn. To the squealers but still some life not much though. Rotors are fine actually and calipers came off relatively easily.

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    pushrod, January 26, 2014, 23:18
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    Ok, sounds like you just need a bigger/better clamp. They dont just ease back, it takes a bit of force! Search youtube for the video on the correct tools and procedure! In fact it's one there for a truck just like your's. Check it out before you buy any tools, you'll see what size clamp is needed! The procedure is about the same all front disc pad replacement. ★Important note; when finished with the install, pump brake pedal about 10 times before starting the engine!!!

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  • Answer #2

    G. T. Service Center (3134 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG January 26, 2014, 20:45
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    How far did the pads go, into the metal. The pistons could be out so far and angled, which you will have to straighten them before they will go back in. Otherwise brake hoses, or master cylinder.

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