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By "rear pad", I assume you mean the rear brake pads.
This operation is slightly tricky. The rear brake caliper pistons actually "screw out" as the brake pads wear and become thinner. Being thinner means the pistons must extend farther out from the caliper.
To replace the brake pads, the pistons must be "reset" to allow space for the new, thicker-than-the-old, worn-out pads to fit in the caliper.
The pistons must be turned opposite the direction they turn as the pads wear to reset/recess them back into the caliper.
Care must be taken to prevent turning the pistons the wrong way ( out ), and not in.
When working on brakes, cleanliness is next to Godliness. Keep it clean!!!
If the pistons extend too far by turning, they cannot be reset and the entire caliper must be replaced.
To facilitate the turning of the pistons, the calipers are generally removed from the carrier they mount on by removing 2 bolts.
There is a special tool to turn the pistons back into the caliper and it works well, but the average VW owner/self fixer-upper won't have this tool. With this tool there is little need to unmount the calipers from the wheel carrier.
All I can say is be very, very careful and DO NOT turn the piston the WRONG WAY (OUT ). Exercise extreme caution and make certain the piston is moving back into the caliper. If not, STOP! Turn the piston back the other way, slowly, and carefully.
Once the pistons are reset the new pads can be inserted into caliper.
It is a good practice to use a anti-squeal paste/grease on the "BACKING PLATE" edges of the brake pads. NOT ON THE BRAKE PADS FRICTION MATERIAL SURFACE.
Also, there may be a slight amount ogf paste applied between the two shims on the back of the brake pad. NOT TOO MUCH TO CAUSE DAMAGE TO THE RUBBER DUST BOOT OF THE BRAKE CALIPER PISTON. Oil and rubber do not like one another. The rubber will swell and the sealing action of the dust boot will be lost forever.
Other than steering, brakes are the most important system on the car. If your life is worth much, maybe a proven expert should be the only one to work on the brake system.
Link to DIY video available in "Sources and related links" section below...
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∙ 11y ago
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