Quick help: rebuilding Hope Mono Mini brakes, what parts do I need?

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Quick help: rebuilding Hope Mono Mini brakes, what parts do I need?

4 posts & 2 voices | Started 2 years ago by JxL | Latest reply from TandemJeremy

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JxL - Member

I received a set of used brakes from STW some time ago, and it appears that the pistons are jammed so might as well do a full rebuild.

Could anyone suggests the parts I will need?

I already have a bleed kit and 5.1 oil.

So far I have added:

4x Pistons http://www.chainreactioncycles.com/Models.aspx?ModelID=9218

2x Seal Kits http://www.chainreactioncycles.com/Models.aspx?ModelID=5086

1x Bore Cap Tool http://www.chainreactioncycles.com/Models.aspx?ModelID=5244

Do I need anything else? There are also Master Piston Seals (which I am unsure whether I need them or not, and how many) http://www.chainreactioncycles.com/Models.aspx?ModelID=20281

Much appreciated.

Posted 2 years ago #
TandemJeremy - Member

You might well not need pistons. Often they can be cleaned up and reused. YOu will only know once you have taken them out tho.New seals is always an idea if you take the pistons right out.

Its much much easier to strip the callipers if you get the pistons moving before you strip them - as you can use the hydraulic pressure to move them

Master cylider is a different project.

Lots of info on the hope site. IIRC 2 master cylinder seals

Posted 2 years ago #
JxL - Member

Well, actually the pistons are moving inwards, but do not go back in enough to fit brake pads (and also one of them is very slow compared to the other). I read somewhere that a rebuild does a good job with the brakes, and since I have some spare time I could have a go myself.

So basically I would only need the seal kit, and not Master Piston Seals?

thanks

Posted 2 years ago #
TandemJeremy - Member

Well worth a try just with seals. You might need pistons you might not. Pump the lever until the pistons are part way out - hold one in if it moves easier than the other. Then strip the calliper. You will probably find dried on muck around the pistons which stop them going all the way in - or it could be as simple as too much fluid ( if the reservoir has been topped up with half worn pads this is possible)

Clean the pistons up - rebuild with new seals. I am a big fan of using red rubber grease to lube pistons - its better than using brake fluid.

YOU might even find that pumping the pistons part way out, cleaning and lubing them then working them in and out a few times is enough to restore them to full working order. Its always worth a bleed thru to replace the fluid as well

Posted 2 years ago #

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