Sierra calipers - piston removal

[joe-motion]

Hi,

i am in the process of refurbishing a set of sierra calipers for the rear disc conversion. I believe you need a specific tool to remove the piston, any recommendations before i either spend too much or buy the wrong one?

Cheers

Joe

Edited by joe-motion on Tuesday 22 October 17:48

[v8s4me]

BigRed might sell one. Better still would be to send the calipers off to them and let them refurbish them for you. Much easier and not that much more expensive then DIY.

[phillpot]

Scroll down to Section 12 - 28

Rear Caliper overhaul

[TVR-Stu]

If I understand correctly all you are wanting to do is remove the piston?

The way I have always done it in the past is by using compressed air. Remove the bleed nipple, put a rag over the end of the piston and 'fire' some compressed air into the recess where the nipple was. You will find that the piston 'pops' out at high speed so make sure your rag is held tightly in place and that your fingers are out of the way.

[phillpot]

TVR-Stu said:

You will find that the piston 'pops' out .

Does that work with rear calipers?

[TVR-Stu]

phillpot said:

TVR-Stu said:

You will find that the piston 'pops' out .

Does that work with rear calipers?

Ah! No, I don't think it does.......
Sorry, must pay more attention. What about some circlip pliers? If it's not seized shouldn't it just wind out?

[GreenV8S]

joe-motion said:

I believe you need a specific tool to remove the piston, any recommendations before i either spend too much or buy the wrong one?

Before you take it apart, make sure you understand how the handbrake mechanism works and especially how to disassemble and reassemble the handbrake automatic adjuster.

[joe-motion]

Decided to send off to Big Red for a refurb. Think the piccys speak for themselves. Thanks for the recommendation!

[88S1]

Hi. Can I ask how much it costs, mine need doing.

Thanks

[joe-motion]

88S1 said:

Hi. Can I ask how much it costs, mine need doing.

Thanks

Just messaged you

[88S1]

Ta

[LLantrisant]

ebay is full of new (or maybe also refurbished?) calipers for quite reasonable prices.

Edited by LLantrisant on Tuesday 12th November 20:11

[Barkychoc]

For future reference the rear pistons you will find have to be removed with a turning action - get a tool to fit a grinding disc it fits great - just turn it on the face of the piston.