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Callipe clean up - Can I rescue these without splitting them

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Davenaylor
Crazy Courier



Joined: 30 Jun 2012
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PostPosted: 12:07 - 30 Mar 2015    Post subject: Callipe clean up - Can I rescue these without splitting them Reply with quote
As per the subject, I have just taken the Callipers off the disks as they are sticking when left stationary. I have received the following advice on bikers oracle:

Quote:
You shouldn't need new seals, nor do you need to go to the extreme of the Bowl of mice strip and clean. Just a clean up should do it. Remove the caliper from the bike, keep the brake hose connected. Remove the pads, you will see the four pistons. Work the brake slowly, one piston will start to move outwards. You have to be very careful not to pop the pistons all the way out, but it is possible to ease them forward one by one, I'd say by 10mm just to be safe. clean all the crud off the sides of the piston with a clean cloth, then gently press it back in, making sure the other three dont move out as you are doing this. It's a bit of a juggling act, a disk brake thickness block of wood is useful to keep two pistons secure whilst you pump out, press back the other two .. I also use a small amount of grease on the piston sides once it's pushed out, has to be Red Rubber grease though, its specially for Brake pistons. This helps to keep the piston sliding free for longer by lubricating the dust seal and providing a bit of a barrier for water ingress.


and

Quote:
What Trumpet said, but be very careful not to push the pistons right out on an ABS model. If you lose too much fluid you'll have to bleed the whole system & that requires special Triumph tools & software to fool the ABS seonsors that nothing untoward has happened. That software is not included in the Tune ECU software.


Before I attempt this I wanted to ask if its worth it based on the picture linked to here (sorry the quality is rubbish!). https://drive.google.com/folderview?id=0B1WfLGfFqSQ8U1ptbE5YcTI1TXM&usp=sharing
Or am I looking at splitting them and doing a full refurb.



Bike is an 05 Sprint ST 1050 ABS model

On the plus side, looking at the pics my brakes should be good once i'm done.

thanks
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bladeblaster
Trackday Trickster



Joined: 19 Jan 2015
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PostPosted: 13:37 - 30 Mar 2015    Post subject: Reply with quote
If it were me I would be popping the pistons out and replacing the seals. Sometimes just dirt can make them sticky, but often its perished dust seals getting trapped between piston and bore.

I haven't had a bike with ABS, however it would seem stupid to need to re-program the system every time you bled the brakes?

Ask a Trumpet dealer about that part.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 19:04 - 30 Mar 2015    Post subject: Reply with quote
Hi

The pistons look a bit corroded in the pics.

I would pump the pistons out a bit (making sure they didn't come out, and that the pistons moved evenly) and check and clean them. But no experience of any oddities with the Triumph ABS system

All the best

K
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mentalboy
World Chat Champion



Joined: 05 May 2012
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PostPosted: 19:11 - 30 Mar 2015    Post subject: Reply with quote
bladeblaster wrote:
If it were me I would be popping the pistons out and replacing the seals. Sometimes just dirt can make them sticky, but often its perished dust seals getting trapped between piston and bore.


Not forgetting that the reason the seals tend to get chewed up is because of corrosion build up in the groove that the seals sit in - so if you do go down the 'remove, clean, (possibly replace)' procedure make sure that those grooves are nice and clean
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Davenaylor
Crazy Courier



Joined: 30 Jun 2012
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PostPosted: 19:53 - 30 Mar 2015    Post subject: Reply with quote
Thanks for the replies.

I have moved them out using a piece of wood and i now have them much cleaner. They move out and go back in with finger pressure now. They are not perfect but its a marked improvement.
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bladeblaster
Trackday Trickster



Joined: 19 Jan 2015
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PostPosted: 10:08 - 31 Mar 2015    Post subject: Reply with quote
Davenaylor wrote:
Thanks for the replies.

I have moved them out using a piece of wood and i now have them much cleaner. They move out and go back in with finger pressure now. They are not perfect but its a marked improvement.


If they move freely like that, and you can't see any frayed bits of dust seal I would leave it there.
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cheeseman
Trackday Trickster



Joined: 11 Jun 2014
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PostPosted: 11:09 - 31 Mar 2015    Post subject: Reply with quote
bladeblaster wrote:
Davenaylor wrote:
Thanks for the replies.

I have moved them out using a piece of wood and i now have them much cleaner. They move out and go back in with finger pressure now. They are not perfect but its a marked improvement.


If they move freely like that, and you can't see any frayed bits of dust seal I would leave it there.


One good thing I did find with my Triumph was that the brakes didn't seize in the seals the way that jap bikes seem to. Not sure why this should be but it suggests that the bores don't get furred up the way that Japanese bikes do (at least Honda and Yamaha). If you only need finger pressure to push them in then you should be good to go.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 19:36 - 31 Mar 2015    Post subject: Reply with quote
cheeseman wrote:

One good thing I did find with my Triumph was that the brakes didn't seize in the seals the way that jap bikes seem to. Not sure why this should be but it suggests that the bores don't get furred up the way that Japanese bikes do (at least Honda and Yamaha). If you only need finger pressure to push them in then you should be good to go.


Wish this were the case for my better halfs Triumph. Twin piston sliding caliper Nissan brakes, and the calipers need frequent strip downs. Plus points is that they are a doddle to strip down

All the best

K
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Ariel Badger
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Joined: 02 Dec 2006
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PostPosted: 19:58 - 31 Mar 2015    Post subject: Reply with quote
Just do the bowl of mice thing Very Happy
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kramdra
World Chat Champion



Joined: 28 Oct 2010
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PostPosted: 21:17 - 31 Mar 2015    Post subject: Reply with quote
Not familar with Triumphs but those do look very similar to 4 pot nissins?!

4 pot Nissins are great. Aluminium pistons clean up very nicely, no corrosion or marks after 60k miles. Inside of calliper is annodised, so no corrosion.

2 pot nissins are horrible, complete opposite. Ive got 6 scrap pistons (mostly spare, but includes the rear brake on my CBR600... it'll need replacing when the pad wears out)

You cant fix it without striping. Crap gets into and behind the seal groves and needs to be cleaned out. If the seals are good, clean them up in brake fluid, dry in a tissue, and inspect for damage. If you push a dirty piston inwards, the dirt will eat through the seal.

ABS, shouldn't be used as an excuse not to do proper maintenance on the most important part of your bike.
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Davenaylor
Crazy Courier



Joined: 30 Jun 2012
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PostPosted: 13:38 - 03 Apr 2015    Post subject: Reply with quote
they are 4 pot nissans. they have cleaned up ok and the bike stops better now. I wasnt using ABS as an excuse, just trying to avoid a costly garage rebuild.
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Old Thread Alert!

The last post was made 10 years, 270 days ago. Instead of replying here, would creating a new thread be more useful?
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