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Problems with brakes sticking

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Eofer
L Plate Warrior



Joined: 14 Dec 2021
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PostPosted: 21:46 - 14 Dec 2021    Post subject: Problems with brakes sticking Reply with quote

MY bike (Yamaha MT09) has recently developed a problem with the brakes sticking on. After being left outside at work all day and after some heavy rain the bike was very difficult to wheel around around and brakes appeared to be seized up some how. Got it moved and going and was OK to ride and once got home was able to wheel around.

Following morning after being in garage brakes again stuck, got to work and bike again OK to wheel around. Come home time same thing and brakes stuck on.

Does any one have any advice on this and what do, something to do with rust forming after being left in rain? felt a bit odd that it keeps happing even and after being left in garage and was no rain today
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 23:01 - 14 Dec 2021    Post subject: Reply with quote

Probably just rust on the disc. if it frees off after a very short distance, I wouldn't worry. Just because your garage is dry, doesn't mean it's low humidity. Condensation likes to form on cold metal so unless it's a heated garage, that's the most likely cause. Road salt will also tend to make them rust more readily by both attracting moisture and as an electrochemical effect.

If it doesn't free off, you could have a sticky piston(s) which at the simplest would mean pumping the pistons out past their current working position, giving them a damned good clean with brake cleaner and a toothbrush then pushing them back in again. At worst a full strip-down.
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davebike
World Chat Champion



Joined: 15 Nov 2013
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PostPosted: 07:41 - 15 Dec 2021    Post subject: Reply with quote

I would pull the callipers off and give them a good clean
I would also lubricate the pivots for both front and rear brake levers
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droog
Spanner Monkey



Joined: 03 Dec 2019
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PostPosted: 17:30 - 15 Dec 2021    Post subject: Reply with quote

Agree with above comments - remove the pads, give the inside of the calipers a good clean, paying attention to the pistons, making sure they are all moving properly and are not sticking.

I used to coat the pistons in red rubber grease to keep them moving properly after a caliper overhaul.

(Tokico six pots on my ZX7R were prone to seizing like this).
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Pete.
Super Spammer



Joined: 22 Aug 2006
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PostPosted: 17:34 - 15 Dec 2021    Post subject: Reply with quote

Dimount the calipers and leave tem hanging on the pipes.
Remove the pads
Put a piece of flat metal (or a spanner etc) in the gap between the pistons where the disc runs.
Pump the pistons out using the brake lever unti they are all touching the metal.
Clean the pistons with some brake cleaner/wd40 and a strip of cloth.
Once cleaned, push the pistons back in, re-fit the pads and re-mount the calipers


If you do it like that you can do all the pistons and no need to bleed the system.
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 17:48 - 15 Dec 2021    Post subject: Reply with quote

Pete. wrote:
Dimount the calipers and leave tem hanging on the pipes.
Remove the pads
Put a piece of flat metal (or a spanner etc) in the gap between the pistons where the disc runs.
Pump the pistons out using the brake lever unti they are all touching the metal.
Clean the pistons with some brake cleaner/wd40 and a strip of cloth.
Once cleaned, push the pistons back in, re-fit the pads and re-mount the calipers


If you do it like that you can do all the pistons and no need to bleed the system.


At best this is only ever a temporary fix. Do the job properly, pull the pistons, clean them and refit with new seals.
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jaffa90
World Chat Champion



Joined: 06 Apr 2016
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PostPosted: 02:04 - 16 Dec 2021    Post subject: Reply with quote

Buy a rain cover and if the same problem get the brakes serviced as mentioned before more expense occurs and of course your safety.
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