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Stuck brake pistons

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Yorkshire Geek
Scooby Slapper



Joined: 02 Jun 2015
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PostPosted: 19:48 - 25 Mar 2017    Post subject: Stuck brake pistons Reply with quote
As always, simple job on 21 year old bike turns out to be slightly harder than expected. I decided to give the brakes a going over before the MOT and they were not only very grubby but I can't get the damn pistons out. Grubby was sorted with some brake part cleaner, but the pistons are stubbornly not shifting.

Looking for alternatives to hooking it back up and trying the hydraulics but I've drained the fluid for replacement. Worst case i refill and try that but I'm looking for alternatives if there are any.

I don't have a compressor before anyone suggests that though, would be handy about now.
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Itchy
Super Spammer



Joined: 07 Apr 2005
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PostPosted: 20:03 - 25 Mar 2017    Post subject: Reply with quote
Buy one of these:

https://www.ebay.co.uk/itm/Sealey-Motorcycle-Motorbike-Brake-Caliper-Piston-Removal-Remover-Pliers-VS1806-/371084615189?hash=item56665dde15:g:dTQAAOSws65ToELT

Or one of these:

https://www.ebay.co.uk/itm/Motorcycle-Motorbike-Scooter-Brake-Piston-Wind-Back-Removal-Garage-Tool-Set-8191-/222055742039?hash=item33b38dba57:g:zHgAAOSwP~tW6YKH

(I have one of these).

Or refill the system and bleed it and use the hydraulic pressure to push them out.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 20:24 - 25 Mar 2017    Post subject: Re: Stuck brake pistons Reply with quote
Yorkshire Geek wrote:

Looking for alternatives to hooking it back up and trying the hydraulics but I've drained the fluid for replacement. Worst case i refill and try that but I'm looking for alternatives if there are any.


Just do it. It won't take as long as you think.

I've got an old master cylinder with a single brake hose on for just such eventualities. I just do it on the bench.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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TUG
World Chat Champion



Joined: 12 May 2007
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PostPosted: 20:29 - 25 Mar 2017    Post subject: Reply with quote
Hook it back up, pump the pistons out. Work smarter not harder.
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kgm
World Chat Champion



Joined: 04 Jun 2015
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PostPosted: 20:33 - 25 Mar 2017    Post subject: Reply with quote
I once used a foot pump and one of the little football type attachments. That piston had been in there without moving for 36 years.
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Yorkshire Geek
Scooby Slapper



Joined: 02 Jun 2015
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PostPosted: 20:46 - 25 Mar 2017    Post subject: Reply with quote
kraggem wrote:
I once used a foot pump and one of the little football type attachments. That piston had been in there without moving for 36 years.

Tried that but even the biggest adapter I have is (to borrow a sexual euphemism) like chucking a hotdog down a hallway. Looking like hook it back up is the likely answer.

Itchy: Tried pliers with a piece of inner tube as padding, are the real ones significantly better than that bodge option?
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Tankie
Crazy Courier



Joined: 24 Feb 2017
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PostPosted: 20:58 - 25 Mar 2017    Post subject: Reply with quote
leave them on he hose and pump them out
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Itchy
Super Spammer



Joined: 07 Apr 2005
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PostPosted: 21:03 - 25 Mar 2017    Post subject: Reply with quote
Yorkshire Geek wrote:

Itchy: Tried pliers with a piece of inner tube as padding, are the real ones significantly better than that bodge option?


The expensive kit works every time. Probably why every BCFer in the norf area has borrowed them.

But as said the other option is just to use the hydralic pressure from putting them back on the master cylinder. A bleed job takes 20 minutes at most.
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Spain 2008France 2007Big one 2009 We all die. The goal isn't to live forever, the goal is to create something that will. In the end, your life will flash before your eyes. Make sure it is worth watching.
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Yorkshire Geek
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Joined: 02 Jun 2015
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PostPosted: 10:29 - 26 Mar 2017    Post subject: Reply with quote
Hooked it back up, went to take the reservoir cover off, screws were stuck and I forgot all about JIS temporarily so stripped them trying to loosen with a PH1 bit. Going to have to drill those out now, replacements should be here Tuesday and finally ordered a set of JIS drivers.
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Petemate
Trackday Trickster



Joined: 13 Nov 2015
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PostPosted: 12:29 - 26 Mar 2017    Post subject: Reply with quote
Yorkshire Geek wrote:
Hooked it back up, went to take the reservoir cover off, screws were stuck and I forgot all about JIS temporarily so stripped them trying to loosen with a PH1 bit. Going to have to drill those out now, replacements should be here Tuesday and finally ordered a set of JIS drivers.


Aint got any JIS driver bits but my original toolkit screwdriver is my friend. It even shifted the three screws on the oil pump which had been on there for 33 years.
Oh, and I had slight problems with the pistons in my caliper, but they came out OK and cleaned up nicely.
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Yorkshire Geek
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Joined: 02 Jun 2015
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PostPosted: 19:55 - 26 Mar 2017    Post subject: Reply with quote
Sitrep: Reservoir screws out without damaging anything else. Rear brake caliper off, front back on and ready for bleeding but ran out of daylight.
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Yorkshire Geek
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Joined: 02 Jun 2015
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PostPosted: 21:56 - 26 Mar 2017    Post subject: Reply with quote
Related question - neither front or rear brake pads had springs behind them. The support pads at the top are present, but not ones that push from behind. How important are they? Hadn't noticed any issues, and presumably the previous owner thought then optional, but should I replace them?
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 22:33 - 26 Mar 2017    Post subject: Reply with quote
Hi

Which springs pushing from behind?

All the best

Katy
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Yorkshire Geek
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Joined: 02 Jun 2015
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PostPosted: 22:44 - 26 Mar 2017    Post subject: Reply with quote
Part 9 on this page for the front - https://www.motorcyclespareparts.eu/yamaha-parts/motorcycles/xj600s-1999/front-brake-caliper-346656.aspx


Part 10 on this for the rear - https://www.motorcyclespareparts.eu/yamaha-parts/motorcycles/xj600s-1999/rear-brake-caliper-346680.aspx
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 23:08 - 26 Mar 2017    Post subject: Reply with quote
Hi

They are a push fit onto the carrier, rather than being on the actual caliper

All the best

Katy
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Old Thread Alert!

The last post was made 7 years, 22 days ago. Instead of replying here, would creating a new thread be more useful?
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