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How do I free a caliper that's siezed onto a disc?
Got me a lovely new -old- Transalp today to do up and go two up with her indoors. First problem I need to overcome is the rear single piston caliper seized onto the disc. Can't shift it. Have given it loads of whacks with a very large adjustable and cardboard to protect it but nothing. Have rocked and rocked the bike too.
Please help! P.S. I'm not abandoning the SV, meerly keeping it for best! :smt036 |
Re: How do I free a caliper that's siezed onto a disc?
Assuming it's the pads stuck onto the disc by corrosion, it may be possible by removing the retaining pins to remove the caliper and leave the stuck pads on the disc for removal later.
Don't know if that would be possible, depends on the caliper/disc configuration I'd guess, but I've used the same technique on classic car brakes with success before. |
Re: How do I free a caliper that's siezed onto a disc?
Assuming I'm gonna rebuild the caliper with new seals would using penetrating spray help and be ok?
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Re: How do I free a caliper that's siezed onto a disc?
You could certainly give it a try, but you'd need to make absolutely sure you remove all traces of the penetrating fluid from the disc before fitting the caliper and new pads back on.
And if you don't already have some, PlusGas is your friend, WD40 might work but PG will get the job done much quicker. |
Re: How do I free a caliper that's siezed onto a disc?
Plusgas? I got some 3 in 1 high performance penetrant spray. Would this contaminate the pads so I need new ones then? Couldn't they just be thoroughly cleaned too? They are relatively new pads you see.
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Re: How do I free a caliper that's siezed onto a disc?
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Re: How do I free a caliper that's siezed onto a disc?
Tried and failed. Read the Haynes and tried again taking out the pads first and succeeded! I did try the penetrating iol but it didn't get the friction side of the pads. I have wiped clean the piston and caliper as much as possible. Why must only brake cleaner be used to clean brake parts as long as they're rinsed clear of all other cleaners? Am I right in thinking I need a caliper repair kit and then just fit it all up again (after cleaning the discs of course)?
:) |
Re: How do I free a caliper that's siezed onto a disc?
i would try some PB or Kroil and the take the caliper off with a mallet
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Re: How do I free a caliper that's siezed onto a disc?
Someone didn't read my post all the way through! It's now in pieces on my living room table.
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Re: How do I free a caliper that's siezed onto a disc?
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Re: How do I free a caliper that's siezed onto a disc?
Cheers mate. Got brake cleaner and after cleaning all parts sprayed seals, piston and caliper where fluid will go. Have refitted it and bled the system. As I used a normal bit of tubing I just left the nipple open, put the end in fluid and kept pumping the brake whilst topping up the reservoir. When the bubbles stopped I tightened the nipple with the pedal down and topped up the reservoir again. This should have done it ok right? As far as I can tell without being able to take the bike for a ride the brake seems fine. Lovely job.
Thanks for you help. Maybe when it's running I'll check and bleed the brake again. :) |
Re: How do I free a caliper that's siezed onto a disc?
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If you're regularly doing little bits and bobs, it's well worth investing in a one-man bleeder - I wouldn't go mental and buy a MityVac unless you're using it a lot, but you can buy a dual circuit non-return valve job from Halfords for about £14.99 - and you can do both front calipers at once. |
Re: How do I free a caliper that's siezed onto a disc?
Cheers. Will get the missus to do the pumping next time and I'll do the bleeding. Got her going tonight! Lovely job.
:D |
Re: How do I free a caliper that's siezed onto a disc?
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