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[Brakes] Retracting rear brake pistons. Tool?
OK , just got car back from Bristol Street motors in Leicester with the brake fluid reservoir sitting on top of the engine so back to doing my own thing. 
I need to change the rear pads but book say piston needs to be rotated clockwise while doing so. How much do they need to turn and do I really need a special tool?

The piston in the rear caliper (Handbrake caliper) needs to be screwed back right into the caliper to allow the fitting of the new pads. 
The piston is sometimes hard to turn and it needs a turning and pushing action to get it to push back into the caliper.

You can buy a wind back tool for under £10 so its worth having and will make the job a lot easier to do.

When the caliper is refitted to the car you then press the brake pedal a few times to pump the piston out and bring the pads up to the disc, then operate the handbrake a few times.

When pressing the brake pedal to pump the piston out it's best to only use short strokes, don't push it right down to the floor as this can damage the seals in the master cylinder.

My vehicle .... 2006 (m59) Berlingo Multispace Desire - 1.6 HDI 92 
£10 windback key......don't fit b9 2008 and easy a rewind caliper tool kit from fleabay £ handy for you a lot of hassle.......RIGHT HAND thread is very fine, it seems its not screwing in......but follow.. jj9 suggestions
.......if hand brake does release far'll need to release cable in handbrake housing inside car.......
Thanks , Sealey tool ordered from Amazon, £11.75.
I was able to use a special tool which had actually come with a woodworking Router, to wind in my rear calipers on my 10 reg B9! It was a "Y" shaped spanner, with 2 stubby pins welded into the ends of the tips of the "Y". This tool was originally designed, so that you could hold the router chuck from turning, while tightening or removing the router bits with a spanner. I also used a woodworking "G" cramp to press the pistons in, while I turned the pistons with my router spanner.

Always improvise and save money if you can.

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