Stuck doing rear brake pads

Hi,

I got myself one of these simple tools:

http://www.ebay.co.uk/itm/390793195286?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT

I'm trying to compress the piston, with the handbrake off, though my piston is so far out there's no room to fit the tool with the shim in it's groove to the inside of the calliper spacing.

This video demonstrates what's needed. The light grey threaded component needs to push back on the black shim which has been placed on the left hand side of the calliper:



I've tried turning mine without the shim in place (it just turns and turns) and pushing but I just can't get the extra 3-4mm to put the shim in to press down on. Once offered up to the piston face the groove in my tool (where the shim sits) is too far back, so that the shim can't fit inside the calliper.

Anyone else ever had this problem?? After 2 hours Halfords Autocentre never looked so good BUT THAT'S DEFEAT

Thanks for the replies.

I'm winding the shiny bit all the way down to the sprocket that marries the piston face (so the bottom in that eBay pic). The groove in the shiny bit (just under the gripped section in the eBay pic) is where the shim wants to sit in, pushing against the inside of the calliper.

I even hacksawed off the knobbles on the sproket (it's reversible as you'll know vr6gordy) so that the shim groove would go a little further down -look at the eBay pic and that'll make sense. Still not enough!

After hours I couldn't see any other way? Happy to be proved a dumbo!

Firstly thanks for your help vr6gordy. This turned out to be a classic "3 hours to do one side, 20 minutes to do the other side" job. For the benefit of the tread:

What I'd done (on the first side) was to screw the piston the wrong way, bringing it out, all the way out. If you do this it'll eventually pop out (sitting within its boot). You can screw it back in a little though it'll mean there's no room to use the shim to compress the piston back fully -per my earlier posts.

SO REMEMBER TO SCREW CLOCKWISE

All you can do is make your own new shim. I used an old wood nail, put a slight bend it in so it could sit in the groove and then press on the calliper. Another tip is to use a ratchet on the tool to turn. The handle is too fidly. A few turns and it'll start to compress then you'll finally have the room to use the proper shim for glory.