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Although you posted this question under a 03 VW Golf and you have a MKV. The best I can do is a MKIV set up. From the rear trunk there are access ports just for this job. The right port will be just above the light housing you will find a wire harness for the right assembly. Follow the harness and it will lead you to the assembly. Once located you can squeeze the two tabs and pull the circuit board where the bulbs are installed. Push on the bulb and twist anti-clockwise then pull out of the socket.
The left should be the same procedure and it is located behind your audio components.
NOTE: It's a good idea to wipe your hand and the glass bulb, leaving oily residue will cause early bulb failure once in operation.
The rear caliper pistons,turn as they go in,one side turns left,the other side turns right,after the piston is turned all the way in,align the notches in the piston to fit the brake pad.A square tool can be purchased at the parts store for very little money,that fits a 3/8 ratchet to do the job of turning the piston.
No, on rear wheel disc brakes, the pistons have to be turned in clockwise, and you need a special tool to do it, or you have something strong enough to put in the slots and turn it, but just turn them in far enough to get the new pads to slide over the rotors.
You will need to check to see if your VW has anti-lock brakes installed on it. The pistons that push in usually look like an inverted cup, hollow end facing the brake pads. The pistons with antilock brakes are usually solid across the top facing the brake pads and will need to be rotated in order for them to collapse back inwards. Some rotate easily, others are a bit more difficult. The pistons on my VW Beetle have two (2) angular grooves opposite one another. If your look like this you may be able to use the blunt end of some needle-nose pliars, or you can head over to your local auto parts retailer for a "magic box", a square cube with as many as five (5) different patterns for the buttons that insert into the angular grooves on different vehcles. Find the pattern that best fits your grooves and attache the magic box to a 3/8 rachet with an extension. Rotate the piston slowley in one direction, then the other to loosen it up. To collapse the piston I believe you will need to rotate counter clockwise. Good luck, this style piston is only on the rear wheels.
You have to clamp the flexible break hose with the appropriate tool that will not damage hose so that no pressure can go back up the break line when then piston is wound back.You crack the bleed nipple just enough that it only flows out when the pressure from the piston being wound back in pushes it out.Once piston is all the way back in retighten the bleed nipple,reassemble caliper etc and bleed.The reason you vent off fluid this way is not to put back pressure on the ABS,Bleeding the brakes is easier and the worst of the fluid(most stressed)is evacuated from the brake lines.Last thing top up the master cylinder with exactly the same fluid that is in the vehicle.Mixing fluids can be hazardous in respect of the ABS and seals throughout the brake system.When winding your pistons take special care as the pistons wind back in in opposite directions.
On the rear brakes on this vehicle you have to screw the calipers in.
As the post above states for solid caliper pistons (which this vehicle has on the rear), there is a tool for this and you can rent it at AUTOZONE. ALSO REMEMBER, if you turn the brake caliper piston Clockwise and it does not go in, turn it COUNTER CLOCKWISE. I cannot remember which side is counter clockwise, but I think it is the left hand side (as you sit in the car).