Attention! There are various brake calipers. Depending on the design, the brake pads are attached to them either by springs or pins. Below is a description of the removal and installation of pads for spring-loaded calipers. See the end of this section for instructions on how to remove and install pads for pinned calipers.
Removing
Mark the position of the front wheels relative to the hub so that the balanced wheels take their original position during installation. For marking, it is enough to make a stroke with chalk or paint on the disc and hub.
Loosen the front wheel bolts, raise the front of the car, remove the wheels.
Attention! If the brake pads are to be reused, they must be marked before removal. Swapping pads from the outside to the inside and vice versa, as well as from the right to the left wheel, is unacceptable. Such a shift can lead to uneven braking. It is highly recommended to use only genuine Opel brake pads. Be sure to replace all front disc brake pads at the same time, even if only one of them has reached the wear limit.
Pry the bracket off the brake caliper with a screwdriver.
Pry out the two caps from the guide bolts with a screwdriver.
Loosen and remove the guide bolts with a hexagon socket wrench.
Attention! Leave the brake hose connected, otherwise you will have to bleed the brake system later.
Remove the brake caliper housing with the inner brake shoe and hang it on a wire hook. When doing this, do not twist or tighten the brake hose.
Pull out the outer brake pad.
Press the inner brake pad away from the piston. The block is attached to the piston by a bracket.
Installation
Attention! When the brake pads are removed, do not press the brake pedal, otherwise the piston will fly out of the housing.
Clean the guide surfaces and pad mounting locations in the housing with a soft metal bristle brush or clean with a cloth soaked in alcohol. Do not use any solvents containing mineral oils or sharp tools.
Before installing the pads, check by hand that there are no grooves on the brake disc. If necessary, the discs can be machined if they are of sufficient thickness.
Measure the thickness of the brake discs.
Check the boot for breaks. Replace a damaged boot immediately, as penetrating dirt will quickly lead to loss of tightness of the caliper.
Press the piston with a forcing tool. If a tool is not available, this can be done with a hardwood rod, being careful not to skew and not to damage the surface of the piston and anther.
Attention! When the piston is depressed, the brake fluid is squeezed out of the brake cylinders into the reservoir. Monitor the fluid level in the tank, if necessary, pump out the excess.
When draining, use a plastic bottle that is only used for brake fluid. Do not use drink bottles!
Attention! Brake fluid is poisonous! In no case do not suck it through the hose with your mouth!
After replacing the pads, the brake fluid level in the reservoir should not exceed the mark "MAX", because the liquid expands when heated. Leaking brake fluid gets on the master cylinder, destroys the paintwork and causes corrosion.
Attention! If the pads are very worn, check the ease of movement of the piston, for which insert a wooden block into the caliper and ask an assistant to slowly press the brake pedal. The piston should move easily. For comparison, install a different brake caliper. Make sure that the piston does not jump out of the caliper. If movement is difficult, repair the piston.
Check the correct position of the piston (tides should be horizontal). If necessary, correct the position using a collet to rotate the piston. Usually no adjustment is required.
Insert the inner brake shoe with spring into the piston.
Insert outer brake pad. Install the brake caliper housing above the brake disc from above into the guide of the brake shield.
Tilt the caliper body down and press down. Lubricate the cleaned dry guide bolt with special paste (e.g. Loctite 262) and tighten to 30 Nm.
Put on the guide bolt caps. Insert the retaining clip into the brake caliper.
Install wheels. Lower vehicle and tighten wheel bolts crosswise to 90 Nm.
Attention! Press the brake pedal hard several times until a strong resistance is felt. This leads to the correct fit of the pads.
Check the fluid level in the tank, if necessary, add fluid to the mark "MAX".
Let the new pads run in by slowing down the car several times by lightly pressing the pedal from a speed of 80 km / h to 40 km / h. Allow the brakes to cool down between times.
Attention! When running the first 200 km, avoid sudden braking.
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