Blue spot front calipers, how to strip?

[NJD]

The front brakes on my '99 FZS 600 are in need of a service and the local shop have showed their incomptience claiming the rear didn't need doing despite it turning the pads and disc blue so I'm going to attempt it myself (the fronts, for clarity.. I've done the rear).

Does anyone have a step by step guide? I know whilst the 'blue spot tool' is available to remove the 'blue spot' this is advised against because its pressurised?

One piston at a time? The piston removal tool might not be powerful enough (the one you put inside the piston and wriggle about) due to corrosion and I can't use my slide hammer kit because there's no space.

I'm just looking for the fastest and simplest way. I've done break rebuilds before, for clairty, its just I don't know if its a half a caliper at a time or one piston then bleed and then do another so on.. which would take forever.

I know the local shop used an air compressor last time but I don't have one. Unless there's one under £50 that's guranteed to work that I assume you stick down a pice of old brake hose attached to the caliper but off the bike?
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The do it all, T̶h̶e̶ ̶b̶r̶o̶k̶e̶n̶ ̶o̶n̶e̶,̶ ̶T̶h̶e̶ ̶b̶i̶g̶ ̶l̶u̶m̶p̶,̶ ̶C̶h̶o̶n̶g̶ ̶N̶o̶o̶d̶l̶e̶

[redeem ouzzer]

If you don't know how to do this then for all our sakes send the calipers to Powerline or someone who does.
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Be a REAL MAN!

[that_impulse_guy]

https://www.bikechatforums.com/viewtopic.php?t=285479
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Gone: Yamaha DT50lc, Suzuki DR500, Suzuki A100, Kawasaki z250ltd, RD350YPVS, Suzuki DR Big, Kawasaki AR125, Kawasaki KMX200, Suzuki GS1000S, Katana 1100, GS550M, Suzuki RGV250
Now: Suzuki GSX400X, Suzuki RF900R, NS400R

[that_impulse_guy]

just adding to my above post....my (not related to yamaha blue spots) front calipers are 4 pistons per side, I did them the old way...one clamp to hold one piston in, block of wood between the other two..and pump out last piston....clean...move on to next piston. Its not terrible to do if..
1) you have a spare master cylinder, in a vice (ebay sells a honda compatible part for like £11 all in with a lever etc)
2) you can then bleed the caliper very quickly to move on to the next piston because you can like, raise 'n lower it etc. Quick to do.

just..messy...lots of fluid...etc.
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Gone: Yamaha DT50lc, Suzuki DR500, Suzuki A100, Kawasaki z250ltd, RD350YPVS, Suzuki DR Big, Kawasaki AR125, Kawasaki KMX200, Suzuki GS1000S, Katana 1100, GS550M, Suzuki RGV250
Now: Suzuki GSX400X, Suzuki RF900R, NS400R

[NJD]

[stinkwheel]

If you get exactly the right thickness piece of wood, and with cunning use of clamps if it seems to be going too far one way, you can usually pump all the pistons nearly all the way out using the master cylinder (you may need to top up the fluid). To the point where you can wiggle them the rest of the way out with your fingers.

It's how I did it last time I serviced my pretech 6-pots. I started by pumping them out against a reasonably thick piece of wood then went with progressively thinner bits (and finally a bit of alloy plate) until they were just hanging in there.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[NJD]

[struan80]

Brakes only slow you down.

[that_impulse_guy]

[c_dug]

Don't know where you're based but I am fairly certain I have a blue spot tool in my toolbox that you can have for free if you decide you need one, if you want it drop me a PM and we can sort out collection/postage.
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[andys675]

I've go silver spots on mine off an XSR700

hardly worth servicing the blue spots, paid £60 for the first pair with oe pads still fitted about 4 years ago, came to service them a few weeks ago and managed to buy another pair on ebay for £40, again with near new oe pads
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Some people feel the rain, others just get wet.

[Fizzer Thou]

I have done the calipers on countless bikes using the same method,be it on my blue spots or the YZF750R 6 pots.

https://i.postimg.cc/43QqrGGH/20200603-120409.jpg

By using an old master cylinder in a vice it was easy to do them on the workbench.You can also reuse the brake fluid once the pistons are out if you do not want to waste any.Bit messy but without a compressor it is the easiest.

https://i.postimg.cc/nhjXkVZs/IMG-20210821-WA0030.jpg

By holding one side of the caliper pistons at a time using one of these tools it was a lot easier.

https://www.ebay.co.uk/itm/395169591447?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D276749%26meid%3D39b3be9bffcc485993a2ef23ef333655%26pid%3D101875%26rk%3D1%26rkt%3D4%26sd%3D173980361917%26itm%3D395169591447%26pmt%3D1%26noa%3D0%26pg%3D2332490%26algv%3DSimVIDwebV3WithCPCExpansionEmbeddingSearchQueryRecall%26brand%3DUnbranded&_trksid=p2332490.c101875.m1851&itmprp=cksum%3A39516959144739b3be9bffcc485993a2ef23ef333655%7Cenc%3AAQAJAAABQEK7FTfzsGw0VauxYyX1IOHjsuXJ1NPjVWebvOca%252BJbVzh3VqcrGnLFKHjKk2M42BtfNs8bK1jFneKBZqmubi3LtP5HaXYEMUaRbBzIO1kLDTmdjInf%252BO05bnZQ8kT0XHIya5K6VXYAi988tSW%252FPr%252FPcGjOKlKt4Aht85VlPA1GFU59DgadvkfaoXnsAyisiYtzUAJtFlVTIc9ZyDekImklebnUbjsoKfgfRmXbHESoqyZXsYAgnH5uMhyA5t9PMOQKDcuAM%252FggAadWp7yRAE9zeqAxCJy6r%252FKsWYTBK1DxqWOTk77whU5YL3eUi4t%252FaEZHqovw4BqdwvIIzyzO5DqrPHkzo6FoH9MDOE8MrVbq6JFPVh67xnEVeR7ue2GY7hFXFKUAoWYMw4itVLojS9iuwlDTHSf6Mdusn3kbNmH5Z%7Campid%3APL_CLK%7Cclp%3A2332490&itmmeta=01JDF9WP3EY6ARXSAYHGFSQE38
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Just talk bikes.What else is there?

Always have a 'Plan B'

[Nobby the Bastard]

I have a slide hammer kit...
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Fizzer Thou]

[Nobby the Bastard]

Most monoblock callipers aren't 4 or 6 piston.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Fizzer Thou]

[Nobby the Bastard]

Is there another way they cann be removed without using air or fluid to pump them out seperately?
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Fizzer Thou]

[Nobby the Bastard]

Aren't they like blue spots where you can remove the back of the piston chamber and push them out?
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Robby]

I have some of those pliers Fizzer Thou linked. They are fine for pulling out pistons from a decent caliper, useless for stuck ones. They will mar the internal surface, which is annoying.

Nothing comes close to hydraulic pressure for making things move that don't want to move. I have yet to come across a piston so rusted it can't be removed; I have removed a piston so rusted that the caliper got scratched to scrap in the process.

Something I haven't tried, but would be an interesting experiment, would be hooking up a stuck caliper to one of the corners on a car. A foot operated, vacuum boosted braking system will probably provide more pressure than my fingers on a handle.

[Ducked]