Do-it-yourself replacement of the rear brake pads on the VAZ-2109

By Lukas Müller On Oct 9, 2022

Stopping any machine is produced by friction. Occurs between the pads and the metal surface of the disc or drum. On VAZ cars of the Samara series, disc brakes were installed on the front axle, and drum brakes on the rear axle. The latter have a long service life, since they make up about 30% of the total charge when the car is stationary. But they still need to be constantly reviewed and changed. How to replace the rear brake pads on the VAZ-2109, we will tell in our article.

In what cases is the replacement

The rear brake pads are usually changed on a VAZ-2109 car in such cases:

With complete wear of the friction linings with a layer thickness of less than 1.5 mm.
If there are traces of oil on the clutch surface.
The pads have a lot of free play, they are very loosely connected to the base.
There are chips, cuts and other signs of deformation on the pads.

The design and features of the pads

On VAZ-2109 cars, like on most budget models, drum brakes are placed at the rear.

Its design is not very complicated, only a few components can be distinguished:

metal base
Friction pad. It is connected to the base with an adhesive composition. Sometimes rivets are used.

Back panel features:

In total, two pairs of pads are placed on the rear axle.
Metal elements are coated with an anti-corrosion layer.
The friction pad is attached to the base with glue. This is done at a temperature of 100 degrees.
Due to further surface treatment, the necessary roughness is imparted. Thanks to this, the grinding of elements is accelerated.
Note that the force acting on the system is very large. So, when braking from a speed of 80 km / h, the following indicators are relevant: the force on the pads is 320 N * m; pressure in the brake system – 40 bar. The pads may come off the base surface. To do this, they need to be affected by a force of 210 N/cm2.
The materials from which the pads are made fully comply with the ISO 9001 certificate.
Due to the use of modern means during braking, the noise level is reduced. This, of course, affects the comfort of people in the cabin.
The elements have a very high wear resistance. Its resource under normal conditions is 70-90 thousand km. But it all depends to a greater extent on the driving style that the driver has. Not the last role is played by the quality of the road surface on which the car moves.

Be sure to replace the rear brake pads on the VAZ-2109 in a timely manner. With your own hands, all the work can be done fairly quickly, but you will need to take into account some points. The most important thing is to follow the sequence.

How to remove pads?

Before replacing the brake pads on the VAZ-2109, you need to remove them. Under them, it is recommended to thoroughly clean the entire surface: dirt and metal chips tend to accumulate there. Disassembly sequence:

The parking brake lever must be down.
Engage first gear in the gearbox.
Install wheel chocks under the front wheels.
It is recommended to raise the entire rear of the machine by placing it on jack stands.
Next, remove the wheel and thoroughly clean the entire mechanism. Please note that do not use gasoline, diesel fuel or mineral type solvents for cleaning.
If there is a lot of liquid in the expansion tank (close to the maximum mark), then you need to pump it up a little. Otherwise, fluid may spill out during replacement.
Unscrew the two pins and carefully remove the brake drum.
Using pliers, remove the lower and upper springs. You also need to remove the guide spring, which is located on the front block (in the direction of travel).
Remove the front shoe first, then remove the expansion rod and guide spring. Disconnect the drive lever from the parking brake cable.
Remove the pin and remove the support washer.
Remove the back cover and remove the support washer.

How to install new pads?

Before replacing the rear brake pads on the VAZ-2109, you need to make sure that this is necessary. Visually inspect the condition of the element, measure the thickness of the coupling with a ruler. Brake pads are installed in reverse order. It is recommended to press the piston cylinders with a hand vise. It is also necessary to process the drums and center them. If the thickness of the drum is small, then you need to put new ones.

When removing and replacing the rear brake pads on the VAZ-2109, there is no need to bleed the system. This must be done if you are replacing the cylinder or lines.