Introduction
This tutorial shows you how to replace the rear brake pads on a 2009 Opel Astra H 1.3CDTI.
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Place two chocks in front of the front wheels and put them into gear.
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Position the jack at the rear lifting point.
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Remove the wheel trim if present and release, without completely unscrewing them, the 5 rear wheel screws using a 17 socket wrench or a cross wrench.
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Raise the vehicle until the wheel no longer touches the ground using the jack and secure by placing a jack stand.
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Finish loosening and removing the wheel bolts.
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Remove the wheel.
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Release the handbrake to release the pressure on the pads.
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The caliper is held in place on its support by 2 13mm screws (red arrows) upper and lower and blocked by 2 15mm lock nuts (blue arrows).
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Place a 15mm flat wrench on the lock nut to immobilize it and loosen the screw with a 13mm flat wrench. Remove the screw from the caliper and do the same with the lower screw.
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Pull the caliper rearward to access the brake pads.
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Using wire, hang the caliper from the suspension spring to relieve the strain on cables and hoses.
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Using a flat tool, lever the brake pads to remove them.
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Clean the pad support area with a brush and brake cleaner.
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Compare the shape, dimensions and screws of the old brake pads with the new ones.
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Systematically change the brake caliper screws, they are supplied with the pads.
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Place the piston pusher on the caliper and tighten the piston pusher to push the piston all the way in to make it easier to fit the new pads.
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Apply copper grease to the pads at the pad-caliper contact areas, this will facilitate pad insertion and limit noise when braking.
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Position the new brake pads
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Replace the brake caliper and install the brake caliper screws
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Hold the lock nut in place with the 15mm open-end wrench and tighten the screw with the 13mm open-end wrench. Do the same with the second screw.
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Apply the handbrake.
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Reassemble the wheel and tighten the screws, and reassemble the wheel trim if present.
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Press the brake pedal several times to put the piston back in place.
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Remove the jack stand and lower the jack to place the vehicle on the ground.
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Do the same on the other wheel then remove the chocks and check that the handbrake is working properly.
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Check the brake fluid level which should be between the minimum and maximum; if the level is insufficient, top up.
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