Home • VAZ • 2109 • Brake system
The design of the brake system of the VAZ 2109 front wheels: 1. Brake hose. 2. Bolt securing the guide pin. 3. Bleeding valve. 4. Wheel cylinder. 5. Bolt securing the cylinder to the caliper. 6. Base mounting bolts.
Diagram of the brake system of the VAZ 2109: 1. Wheel cylinder. 2. Piston. 3. Brake caliper base. 4. Brake disc. 5. Brake pads. 6. Caliper.
Replacing the front brake pads of a VAZ 2109
Before starting work on replacing brake pads on a VAZ 2109, brake the car with the parking brake and install thrust bars under the rear wheels. Raise and support the front of the car and remove the wheels
Through the hole in the brake caliper body of the VAZ 2109, visually check the condition of the pads and remove the rubber seal along with the hose from the bracket
>
Using a screwdriver, bend the tendril of the lock washer of the upper guide pin fastening bolt and unscrew the upper guide pin fastening bolt, while holding it by the hexagon wrench
Rotate the caliper body downwards around the axis of the lower pin and remove the brake pads
Install new brake pads. Make sure the pressure springs are parallel to the top edge of the brake pads. Turn the bracket body and tighten the upper guide pin mounting bolt with a torque of 31-38 Nm (3.1-3.8 kgf m), while holding it by the hexagon wrench
Use a screwdriver to bend the lock washer. Install the wheel and lower the car to the ground. Then press the brake pedal several times to set the brake pistons to their working position. Check the brake fluid level in the reservoir and top up if necessary. This completes the replacement of the front brake linings of the VAZ 2109.
Removal and repair of brake caliper VAZ 2109
Unscrew the fastening nut and disconnect the brake hose from the fitting of the wheel cylinder of the VAZ 2109. Plug the hole in the hose and use a screwdriver to bend the antennae of the lock washers of the two bolts securing the guide pins
Unscrew the lower bolt securing the guide pin, while holding it with a hexagon wrench and lift the caliper up and in the same way unscrew the upper fastening bolt
Remove the VAZ 2109 brake caliper with the wheel cylinder from the base and clamp the caliper in a vice and unscrew the two hexagon socket bolts securing the cylinder to the caliper
Remove the wheel cylinder from the caliper and carefully, so as not to tear the protective cover, remove the retaining ring, and then the protective cover - the brake piston boot of the VAZ 2109
After applying compressed air through the brake hose fitting, remove the piston from the cylinder
Carefully, so as not to damage the cylinder mirror, remove the O-ring and unscrew the bleeder valve if it is necessary to replace the wheel cylinder or the valve itself
To replace the brake caliper base, remove the two bolts that secure it to the steering knuckle. Assembly and installation of the VAZ 2109 brake caliper is carried out in the reverse order. Before assembly, lubricate the O-ring, piston and cylinder bore with brake fluid with fresh brake fluid.
When installing the piston into the cylinder, insert the edge of the protective cap into the groove in the piston, then insert the piston into the cylinder and insert the outer edge into the groove in the cylinder body. Install the retaining ring. Before installation, lubricate the guide pins with UNIOL-1 grease.
repair of the front wheel brake caliper on a VAZ 2108, VAZ 2109, VAZ 21099
To repair or replace the front wheel brake caliper on a VAZ 2108, VAZ 2109, VAZ 21099, do the following: 1. Remove the corresponding wheel from the vehicle. 2. Remove the brake hose seal from the bracket on the rack.
3. Loosen the brake hose connector on the caliper.
4. Use a screwdriver to bend the antennae of the lock washers and unscrew the two bolts securing the brake caliper, holding the guide pins by the hexagons with a second wrench. 5. Remove the bolts and remove the brake caliper and wheel cylinder assembly.
6. Holding the tip of the brake hose by the hexagon with a wrench, unscrew the brake caliper from the tip. Be careful, brake fluid will leak from the brake hose. Please note that the tip has a copper O-ring. Replace the heavily crimped copper ring.
7. Clamp the brake caliper in a vice and remove the two Allen bolts securing the brake cylinder to the caliper. Remove the wheel brake cylinder from the caliper.
8. Carefully, so as not to tear the boot, remove the retaining ring.
9. Remove the boot from the brake cylinder
10. After applying compressed air through the brake fluid supply holes, remove the piston from the brake cylinder.
11. Carefully, so as not to damage the brake cylinder mirror, remove the rubber O-ring.
12. If it is necessary to replace the wheel brake cylinder or the valve itself, unscrew the brake bleeder fitting. 13. Carefully inspect the brake cylinder mirror and the working surface of the piston. If signs of wear, damage or severe corrosion are found on them, it is necessary to replace the brake cylinder and piston. 14. Replace damaged, swollen or loose cuffs. It is recommended to replace the cuff every time the brake cylinder is disassembled, regardless of its condition. 15. Install a new cuff into the bore of the brake cylinder, having previously lubricated the cuff with fresh brake fluid.
16. Insert the edge of the boot into the piston groove.
17. Lubricate the brake cylinder mirror and the working surface of the piston with fresh brake fluid. Insert the piston into the brake cylinder and install the outer edge of the boot into the groove of the cylinder body. Install the retaining ring.
18. Install a caliper with a wheel brake cylinder on a VAZ 2108, VAZ 2109, VAZ 21099 car in the reverse order of removal. Before installing the guide pins, lubricate them with UNIOL-1 grease. Bleed the brake system on a VAZ 2108, VAZ 2109, VAZ 21099 car.
Replacing the front brake discs of a VAZ 2109
To remove brake discs from a VAZ 2109, set the car to the parking brake, lift and place the front part of the car on supports and remove the wheels.
Using a screwdriver, bend the antennae of the lock washers of the two bolts securing the guide pins and unscrew the lower bolt securing the guide pin, holding it with a hexagon wrench
Remove the caliper with the wheel cylinder from the base and lift the caliper up and in the same way unscrew the upper mounting bolt
Hang the caliper with the wheel cylinder on a wire to the front suspension spring. At the same time, make sure that the brake hose is not twisted or too tight, then remove the brake pads of the VAZ 2109. At the same time, mark the pads to install them in their original places
Unscrew the two alignment pins and remove the brake disc. Installing the front discs of the VAZ 2109 is carried out in the reverse order of removal; before the trip, be sure to bleed the brake system by pressing the brake pedal 3-5 times so that the pistons of the VAZ 2109 calipers are in working condition.
How to remove the caliper VAZ 2108, 2109, 21099
The caliper (front wheel brake mechanism) will have to be removed when replacing its brake cylinder, replacing damaged parts, replacing the front wheel hub bearing, or painting.
— Open-end wrenches for “13”, “14”, “15”, “17” — We hang and remove the front wheel of the car
— We clean the front wheel brake mechanism from contamination
We remove the caliper (front wheel brake mechanism) VAZ 2108, 2109, 21099
"Quick" way to remove the caliper
If you plan to disconnect the brake hose from the caliper, before removing it, use an open-end wrench to “14” (in some cases to “15”) to loosen the tightening of the hose tip on the brake cylinder. Place a container under the caliper to collect the brake fluid.
— Through the inspection hole of the caliper, use a slotted screwdriver to slightly move the brake pads apart (so that they move away from the brake disc)
See photo at the beginning of the article.
— Using a socket wrench set to “17”, unscrew the two bolts securing the caliper to the steering knuckle
It is better to access the lower bolt from below, and the upper one from above.
— Remove the caliper by sliding it up the brake disc
If the brake disc does not have much wear, it is not difficult to move it.
— Holding the tip of the brake hose with a key at “14”, rotate the caliper until the tip is completely turned out (if it is necessary to completely separate the caliper)
VAZ 2108, 2109, 21099 caliper removed
"Slow" method of removing the caliper
— Disconnect the floating caliper bracket
Using a screwdriver, bend the edges of the locking plates of the guide pin bolts. Holding the guide pin with an open-end wrench set to “17”, use a wrench set to “13” to unscrew the lower bolt. We lift up the floating bracket by prying it with a screwdriver. We remove the brake pads. We lower the bracket. Similarly to the lower one, unscrew the upper bolt and remove the bracket along with the brake cylinder. We remove the guide pins from the holes in the fixed bracket.
— Disconnect the brake hose
The brake hose will have to be disconnected when the caliper is completely removed. In another case, for example, when replacing a wheel bearing, the brake hose is not disconnected, but the removed caliper is moved to the side and suspended on a wire. The hose tip is turned off with an open-end wrench to “14”. You can hold the tip with a key and rotate the brake cylinder until the hose tip is completely unscrewed from it. There is a copper O-ring underneath. We bend the brake hose and secure it with wire so that the brake fluid does not leak out.
— Disconnect the fixed caliper bracket
Using a 17" socket wrench, unscrew the two bolts securing the fixed bracket to the steering knuckle. Remove the fixed bracket.
— Disconnect the brake (wheel) cylinder
It is better not to remove the brake cylinder unless necessary. We clamp the floating caliper bracket in a vice and with a 10-point socket, unscrew the two screws securing the brake cylinder and separate it from the bracket.
That's it, the VAZ 2108, 2109, 21099 caliper is completely removed and disassembled.
We assemble and install the caliper in the reverse order. The tightening torques of the fixed bracket mounting bolts are 29-36 N.m, the guide pin bolts are 31-38 N.m, the brake cylinder mounting screws are 115-150 N.m.
If the brake hose was disconnected when removing the caliper, then after assembly and installation it is necessary to remove air from the brake system (“bleed” the brakes).
— The front wheel brake mechanism (caliper) on VAZ 2108, 2109, 21099 cars consists of a fixed bracket (brake pad guide) attached to the steering knuckle with two 17-point key bolts and a floating bracket consisting of two screws fastened together under edge on “10” of the brake cylinder and the caliper itself. The brake cylinder is fastened with two bolts with a wrench set at “13” to the guide pins (wrench set at “17”) installed in a fixed bracket. A brake hose is connected to the brake cylinder.
More articles on the braking system of VAZ 2108, 2109, 21099 cars
