SOURCE: Audi A4 need to replace rear brake light on audi a4
Inside the boot is a plastic cap embeded in the boot liner. Remove the cap to reveal a screw. Undo the screw and the whole rear light cluster will come away in a sideways and not rearward direction to reveal all of the bulbs. Hope this helps.
SOURCE: applied brakes pulsate
If ABS is activating for no apparent reason then the most common causes are failed ABS wheel sensors or more commonly, cracked reluctor rings.
You won't usually see the crack in a reluctor ring, but it opens up when it rotates at running speeds. You can also get it to show with a simple fluorescent dye crack testing kit (not cheap to buy for a one-off job, but any decent garage or engineering workshop will have a kit to hand).
Unfortunately, reluctor rings are expensive as they usually come as an integral part of the driveshaft or hub assembly. Third party versions may be available and are less expensive (still a painful price though) but to fit them they must be heated until cherry red and then dropped into position. Get it wrong and you have to cut off your new and expensive ring and start again. Not really a DIY job unless you're very confident and experienced.
If the crack test proves negative, then ABS sensors are easy to fit and can be tested by swapping around to see if you can move the fault from one wheel to another or even from the front to the rear. Sensors are relatively cheap, but failures are far less common than with reluctor rings.
Fingers crossed for you that it's the easy/cheap fix.
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