Removing the front brake pads is the first step.
Left: plug for brake pad wear indicator (1) disconnect by pushing down the cotter pin. The second component of the plug (2) remove from the holder at the disc brake caliper. To do this, carefully lift the plastic latch (arrow) using a screwdriver, turn the plug and remove from the holder.
Right: using a screwdriver (1) release spring latch (2) on the disc brake caliper.
In this case, the brake fluid is squeezed out through the pipeline into the receiver. If an excessive amount of unnecessary fluid was added in the past, then this excess must now be pumped out. Otherwise, escaping brake fluid will spill onto metal parts located in the engine compartment. To pump out, you need to use only an absolutely clean pipette or an old medical syringe - in no case do not suck with your mouth!
Raise the car at the front and secure.
Remove wheel.
Turn the steering wheel so that the blocks can be easily reached.
Disconnect the plug for the brake pad wear indicator by pushing down on the cotter pin.
Detach the second half of the plug element from the holder. To do this, carefully lift the plastic latch with a screwdriver, turn the plug and remove it from the holder.
Release the spring latch on the outside of the disc brake caliper with a screwdriver.
Remove the cap on the inside of the brake caliper.
Insert a socket wrench into the now open hex socket of the bolt and loosen both bolts (illustration bottom left).
Pull out the bolts, remove the disc brake caliper bracket.
Hang the removed bracket on a wire to the suspension strut.
Remove the pads on the right and left from the brackets of the disc brake caliper: the inner pad comes out with the mounting brackets from the brake cylinder piston, the outer pad - possibly with force - is removed at the point of gluing with the caliper.
Remove the remaining adhesive film from the contact surface of the outer lining.
Clean the brake caliper; above all, the guide rails must be free of rust.
Install new pads; To glue the outer caliper, remove the protective film in the places of gluing.
Put the support in place.
Tighten the guide bolt to 25 Nm and put the cap back on.
After assembly, press the brake pedal several times until the pads are pressed against the brake discs. Otherwise, there will be no braking effect!
When driving the first 500 km with new brake pads, brake as carefully as possible.
Removing the front disc brake caliper
Each of the front disc brake calipers is mounted on the suspension strut with two so-called grooved bolts. These bolts have a serrated surface behind the hex head to prevent accidental loosening or falling out of the bolt. Under no circumstances should these knurled screws be replaced with normal ones!
Remove wheel
Remove brake pads with brake caliper calipers (as described in the previous section).
Suspend the brake caliper with the hose connected so that the hose is not under tension.
Or remove the brake hose or tube. In this case, depress and hold the brake pedal to prevent leakage of brake fluid.
Loosen the caliper mounting bolts on the brake shield.
Before installing, clean the serrated surfaces of the ribbed bolts.
Left: Loosen both hexagon bolts located in protective shells (1 and 2), after removing the protective cap (3).
Right: This shows how the plunger in the disc brake caliper is pushed back with a clamp to allow new brake pads to be installed. Place a small board to protect the piston.
Tighten knurled bolts to 125 Nm.
Reinstall the brake hose or pipe.
Remove air from the brake system if the brake pipe or hose has been removed.
Before driving off, depress the brake pedal several times until normal pedal travel is established.
Replacement of cuffs of brake pistons
If the brake piston cup in the disc brake caliper has been damaged, then you need to replace it as soon as possible, otherwise the brake piston will soon begin to seize due to dirt and corrosion. The seal can only be purchased as a set with a brake piston sealing ring. To install both parts, it is necessary to remove the piston from the brake cylinder body. For safety reasons, it is better to entrust this work to a workshop. For example, remove the disc brake caliper and take it to the workshop.
Replacing the front brake disc
Brake discs must be changed on both sides at the same time. One-way replacement will result in uneven braking action.
Disconnect the disc brake caliper and fasten it with wire to the body; the hydraulic hoses remain connected.
Now you can manually remove the brake disc from the wheel hub.
Disconnect the disc brake caliper and fasten it with wire to the body; the hydraulic hoses remain connected.
If it is rusted, help with sharp hammer blows, but only if this disk must be changed anyway
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