We change the pads in the event of the maximum permissible wear of their linings — the minimum thickness of the pad, including its base, must be at least 6 mm.
The pads must also be replaced when replacing the disc of the brake mechanism, when the linings are oil-contaminated, or when there are deep grooves, cracks and chips on them, as well as when the linings peel away from the pad base.
We carry out the work on a level surface, an inspection pit or a trestle.
If the fluid level in the reservoir of the brake hydraulic drive is at the MAX mark, then before installing the new pads we extract part of the fluid from the reservoir with a syringe or a rubber bulb.
This operation must be carried out so that, when the piston is pressed into the wheel cylinder of the brake mechanism during installation of the new pads, fluid does not leak out from under the reservoir cap.
We remove the front wheel.
Before installing the new pads, the wheel cylinder piston must be moved as far as possible into the cylinder.
To do this, having inserted through the opening in the caliper a wide-blade screwdriver between the base of the inner pad and the piston and resting it on the pad, we press the piston into the cylinder.
By hand we prise up the spring retainer.
We remove the spring retainer.
With a flat-blade screwdriver we prise up the bush caps.
We remove the bush caps of both guide pins.
With a 7 mm hex key we unscrew the lower guide pin.
We take out the guide pin.
We also unscrew and remove the upper guide pin.
We lift the caliper (without disconnecting the brake hose from it) together with the inner pad.
Overcoming the resistance of the spring tabs (on the base of the pad) entering the opening of the piston, we take out the inner pad.
We take the outer pad out of the pad guide.
With a metal brush we clean the seating places of the pads and guide pins from dirt and corrosion.
Before installing the new pads we check the condition of the rubber bushes of the guide pins.
If necessary, we replace them.
In the photo — front brake pads of the left wheel.
