Front caliper help please (pressed in when wheel was off) - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 7 Old 03-16-2013, 04:07 PM Thread Starter
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Front caliper help please (pressed in when wheel was off)

I had the front wheel off (tire change) and asked my 11 year old son to help me put it back on by holding the handlebars while I wrestle the thing back on and get the axle in.

Well, he felt compelled to press the front brakes in while the calipers were off. Sigh.

Now - the right caliper did not get pressed in, but the left one did. I got two questions:

1. I am noticing that only one of the pistons pushed out; is this expected? See the picture below. It IS the piston that is "closer" to the brake line so I am thinking that this is possibly expected as there was nothing to squeeze "into" so the oil pressure simply pushed the first piston out, no resistance and all... Or - is my theory wrong and I should be looking at that caliper closer as the other piston might be seized?

2. How the heck do you push the piston back in? It seems elementary, yes but - I opened the top (master cylinder) and tried to push the piston back in with a small plastic-tipped C-clamp I have and it won't go? Dumb question: does the brake lever needs to be pressed in when I push the piston back in?


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post #2 of 7 Old 03-16-2013, 04:12 PM
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There is no need to open the master cylinder reservoir. I don't see any sign of fluid loss. You might want to clean things up first. Then put the other brake pad back in. Put a large flat blade screwdriver between the pads and pry them apart. Apply pressure in such a manner as to keep the piston from cocking in the hole.

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post #3 of 7 Old 03-16-2013, 04:58 PM Thread Starter
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Thank you! I did so and as you said - it just took a little bit of determination.

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post #4 of 7 Old 03-16-2013, 07:21 PM
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sometimes it takes a lot of determination to push back the piston!

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post #5 of 7 Old 03-16-2013, 10:07 PM
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Sometimes when cleaning as GW suggested you'd have the thing all apart and use compressed air to move the piston. That can get exciting if your fingers are in the way.
Using a wooden wedge to separate the pads may be easier on them. They can get a get chewed up by a screwdriver when prying apart.
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post #6 of 7 Old 03-16-2013, 10:49 PM
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The piston with the least resistance (least amount of crud) will push out first. Hydraulics spreads the pressure out evenly. Proximity to the inlet probably didn't even apply when the caliper was out'a da box new.

At least the piston didn't push all the way out and drain the fluid for you!

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post #7 of 7 Old 03-16-2013, 11:15 PM Thread Starter
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Quote:
Originally Posted by PTRider View Post
The piston with the least resistance (least amount of crud) will push out first. Hydraulics spreads the pressure out evenly. Proximity to the inlet probably didn't even apply when the caliper was out'a da box new.

At least the piston didn't push all the way out and drain the fluid for you!
I guess I lucked out because there was no more space there, heh... the pads were pressed tight. The pad you see there is pretty much how the other one looks like too. They have about 26000 miles on them btw.

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