Re-installing front brake calipers after wheel removal. Won't go back on!


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bofler
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Re-installing front brake calipers after wheel removal. Won't go back on!

Post by bofler » Sat Sep 07, 2019 5:21 pm



Took off my front wheel for a tire change and putting everything back on now...and the calipers won't go back onto the rotors. The pads have closed in a bit and can't slide it back on. Any solutions other than ripping apart the calipers?



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Aussie81Interstate
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Re: Re-installing front brake calipers after wheel removal. Won't go back on!

Post by Aussie81Interstate » Sat Sep 07, 2019 7:01 pm

Get a large flat bladed screwdriver or a thin piece of flat metal and pry the pads apart by levering the screwdriver against the pad. Pretty simply you push the pads back into the caliper.

Then when they are pushed back, simply put them back on, bolt them up - make sure to put both calipers on and bolted up BEFORE you use the front brake lever.

Possibly you may have grabbed the front brake and that would be enough to push the pistons out a little bit and enough to not have enough clearance of the pads before putting them back on.

Cheers

:)

bofler
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Re: Re-installing front brake calipers after wheel removal. Won't go back on!

Post by bofler » Sat Sep 07, 2019 8:08 pm

Thanks! Yeah, I figured out the solution...open the bleeder and physically force the pistons back. All good now!

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Aussie81Interstate
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Re: Re-installing front brake calipers after wheel removal. Won't go back on!

Post by Aussie81Interstate » Sat Sep 07, 2019 11:53 pm

You may not have needed to open the bleeder screws, the screwdriver option just pushes the brake fluid back into the master cylinder - as long as you are not too aggressive with it - you should not lose any fluid out of the top of the master.

Glad you got it sorted.

bofler
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Re: Re-installing front brake calipers after wheel removal. Won't go back on!

Post by bofler » Sat Sep 07, 2019 11:59 pm

i tried just pressing them back and it didn't work. needed to open the bleeder and release a bit of pressure...tomorrow, timing belts and valves.

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OldguyGlen
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Re: Re-installing front brake calipers after wheel removal. Won't go back on!

Post by OldguyGlen » Mon Sep 09, 2019 11:19 am

Aussie is giving you good advice. If you couldn't force the pads back into the caliper without releasing the bleeder, then you may have a plugged return port in the master cylinder. This is a very tiny hole in the forward part of the master, viewed by taking the reservoir cover off. If it remains plugged, your front brakes will not ever release properly after pressure is applied. This can cause pad/rotor wear or WORSE... front brakes can LOCK UP on you. Verify that the pads release after pressure is applied.
Same thing on the rear master cylinder while you are checking the brake system.

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WingAdmin
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Re: Re-installing front brake calipers after wheel removal. Won't go back on!

Post by WingAdmin » Mon Sep 09, 2019 1:14 pm

Actually, it's always a good idea to open the bleeders before pushing the pistons back into the calipers. Otherwise, you are pushing the dirty, contaminated fluid (gravity pulls all the sediment and filth down into the caliper) back up to the master cylinder, where it WILL block the return port. Better to squirt that nasty stuff out the bleeder when you retract the pistons, then after everything is installed and brakes are tight, top up the master cylinder with fluid as required.

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pidjones
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Re: Re-installing front brake calipers after wheel removal. Won't go back on!

Post by pidjones » Tue Sep 10, 2019 6:18 am

To avoid this problem in the future, as soon as the calipers are removed wedge a couple wooden shims like carpenters use for shiming doors between the pads, or at a minimum a doubled piece of corrugated cardboard. I used to use the cardboard, but now have some shims that I keep for that purpose.



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