An important part of the brake mechanism is the caliper. It holds the brake wheel cylinders, which, when the pedal is pressed, compress the brake disc, slowing down the rotation of the wheel. Over time, the brake cylinders and the brake caliper of the VAZ 2107 wear out and the wheel begins to brake worse, which can lead to pulling to the side when braking or brake failure. Therefore, these parts need to be monitored and, if necessary, repaired or replaced.
Front brake device for VAZ 2107
1 — fitting for bleeding the front brake drive; 2 — connecting tube of working cylinders; 3 — brake pad wear indicator wire; 4 — wheel cylinder piston; 5 — wheel cylinder clamp; 6 — brake pad lining; 7 - sealing ring; 8 — dust cap; 9 — pins for securing the pads; 10 — bolt securing the caliper to the bracket; 11 — steering knuckle; 12 — caliper mounting bracket; 13 — caliper; 14 — protective casing; 15 — cotter pin; 16 — pad pressure spring; 17 — brake pads; 18 — wheel cylinder; 19 — brake disc.
- Having disconnected the wires of the 3 front pad wear indicators from the plug connections of the wires, remove the cotter pins 15, and then the pins 9 with the springs, remove the springs 16 and the brake pads 17. Mark the pads so that during reassembly you can install them in their original places.
- Having straightened the locking plates, unscrew the two bolts 10 that secure the caliper to the bracket, and remove the caliper.
NOTE! It is possible to remove the front brake (without brake disc) complete with brake pads. In this case, it is enough to disconnect the plug connections of the brake pad wear indicator wires, disconnect the caliper hose and unscrew the caliper mounting bolts 10.
Replace or restore?
If the piston jams in the working cylinder, you won’t be able to get rid of it by purchasing a repair kit, which usually only includes boots with cuffs and sealing rings. After all, it is necessary to restore the surface of the cylinder, and the piston must be replaced altogether. How expensive it will be to repair rear calipers yourself depends on the design features of the brakes, the model of the car and the degree of neglect of the problem. However, you will definitely have to purchase a new piston or look for a used one, and in extreme cases, buy a new unit. Its price fluctuates in a very different range: for mass-produced cars, a caliper costs 4-5 thousand rubles, and for premium foreign cars or rare models the price can reach up to 12-13 thousand rubles.
Therefore, the most expensive option is rarely chosen, and car owners usually buy used cars - after all, they cost 5 or even 10 times cheaper. As for caliper repair, it is even more profitable, since we get an almost new unit. After all, almost everything changes - guides, pistons, cuffs, etc., only the brake cylinder body restored by sandblasting remains old. However, in any case, repairs should begin with a visual inspection of the mechanism.
How to choose spare parts
How long the pads will last depends on the driver’s driving style (aggressive driving) and the conditions under which the car has to be driven. The pads wear out faster if the car moves around the city in jerks: either picking up speed in fairly short sections, or using sharp braking.
Helpful advice: When choosing spare parts, it is not enough to be guided by cost or brand. When purchasing new brake pads, buy them from the same batch. The features of friction lining production are important. If the spare parts are from the same batch and from the same manufacturer, the difference in the physical and mechanical properties of the material will be insignificant.
The procedure for replacing brake pads is carried out on both wheels of the same axle at once. Wherein:
- Be sure to analyze the condition of the parts and mechanisms of the brake system.
- To assess brake disc wear, use a caliper and measure its thickness.
- Check the entire assembly for damage and find out if the geometry of the structure is broken.
The piston (cylinder) is faulty
Poor quality of brake fluid, the appearance of rust on the surface when the boot of at least one piston (cylinder) ruptures or as a result of prolonged downtime of the machine entails its partial jamming.
This will initially be heard when its operation is delayed, when the pads begin to knock on the disc. In order to make the repair yourself in this case, you need to disassemble the caliper and pull out the rusty piston; this must be done after the guides have been unscrewed and the boot and retaining ring have been removed.
If the cylinder still moves even slightly, you can squeeze it out using a compressor by inserting a hose into the hole for supplying brake fluid. This can also be done without first disconnecting the housing from the brake system; you just need to press the pedal, after which the created pressure will squeeze the cylinder out of its seat. If it is tightly jammed, then a preventive measure can be soaking it in gasoline and other similar liquid.
It is worth considering that the rear caliper piston cannot be removed, but is simply unscrewed along the threads with pliers or a similar tool. After this, you need to wash the cylinder seat and clean it of dirt and rust. It is also worth doing with the piston (cylinder) itself. Next you need to insert the cylinder into place. It would be useful to replace its boot with a new one during assembly. You can see this in more detail in the attached video.
Step-by-step process for replacing brake pads
After preparing all the tools, first measure the fluid level in the corresponding reservoir. The engine must be turned off. If the indicator is exceeded from the maximum, select some of the fluid so that nothing subsequently gets on the brake disc.
Raise the handbrake and place chocks under the wheels to prevent the car from rolling. Only now can you lift the car using a jack. Remove one wheel and clean the entire mechanism responsible for braking using a rag. If rust is visible, apply WD-40 for easy removal of the guides.
Unsplit the guides with thin-nose pliers. Place a drift in a convenient position and carefully knock out the guides (not completely) to the extent that the brake pads are freed.
Remove the pressure springs from the pads. Now take pliers and use them to press the pistons into the cylinders. Once completed, you can remove the brake pad from the mechanism.
After dismantling the part, carry out an analytical inspection - determine the degree of production; if everything is normal, replacing it is a waste of time. The part can still continue to work out its service life, and the malfunction itself lies in a completely different functional unit of the car. If you determine the presence of wear, prepare a new pad for installation.
Read, it may be useful: Replacing ball joints
Take some grease and apply it to the guides. Be especially careful - the product should not come into contact with other functional components of the brake system.
To successfully install a new brake pad, all steps are performed in reverse order:
- Install the block.
- Install the springs.
- Reinstall the guides to secure the pad.
- Use thin-nose pliers to tighten the guides.
- Check that all mechanisms are secure, after which you can install the wheel.
- Lower the jack and remove the supports.
Once the procedure is complete, repeat the same with the other front wheel.
Once the pads are installed, start bleeding the brakes. To do this, simply press the corresponding pedal sharply several times. Then check the brake fluid level in the reservoir. If the level is lower than required, add the missing amount.
If you feel that you do not have enough experience to perform this work, contact a private workshop where a specialist will complete the work in a short time.
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Visual inspection
First you need to make sure that the piston is in good condition: with light pressure, it should be freely recessed into the cylinder body. In addition, it should not have rust or a lot of dirt. Next, we inspect the functionality of the caliper guides, the integrity of the boot, and move on to the pads - it is unacceptable if the difference in their thickness is visible to the naked eye.
Since the piston returns to its original position using a cuff - it not only seals, but also acts as a spring - you need to make sure of its integrity. However, this is not all, since during its operation the cuff is deformed, and over time it can reduce its springing properties. To check this element, it is enough to hang the wheel and, when pressing or releasing the brake pedal, make sure that the wheel rotates freely.
And most importantly: under no circumstances should there be any signs of overheating on the disks, as evidenced by the purple color of the metal!
What is needed to remove the caliper
- screwdriver or bit;
- keys for 17, 14 and 10;
- pliers;
- a piece of rubber tube or bolt with a diameter suitable for the inner diameter of the brake hose tip;
- marker.
It is necessary to remove and install the caliper when replacing it in case of deformation or damage. This is also a necessary action in order to repair the VAZ 2107 caliper.
To carry out the work, you must lift the car on a lift or use a jack. The latter option is somewhat more tedious, but ideal for home use.
Where can I buy?
VAZ 2107 calipers can only be purchased in city auto stores or online trading platforms.
This is due to the fact that the production of original models for retail sales was discontinued back in 2014. Therefore, any caliper sold in a new condition has an old restored body at its base, on which completely new cylinders, tubes and other small elements are placed. Purchasing a frankly Chinese analogue is not considered, since the complex of measures to modify them out of the box consists of cutting new threads and fitting the goujon, replacing rubber products, as well as filling the space under the boot with anti-squeak lubricant.
Removing the brake caliper
To remove the caliper you must do the following:
- lift the car on a lift or jack up the wheel on which the brake caliper needs to be removed;
- Using a wrench, remove the bolt securing the brake hose bracket;
- remove the bracket so that it does not interfere with further actions;
Important: under the bracket fastening bolt there is a spring washer, which must not be lost when dismantling the bolt and bracket.
- unscrew the bolt securing the brake hose;
- remove the bolt after first removing the two o-rings;
- insert a rubber tube or bolt of a suitable diameter into the hole in the brake hose tip to prevent brake fluid from leaking out;
- Use pliers to remove the cotter pins securing the brake pad pins;
- pull out the pins securing the brake pads and remove them using a bit or a thin, but not sharp, screwdriver;
- remove the retaining springs from the brake pads;
- remove the brake pads;
Advice: if you plan to use the brake pads in the future, they should be marked with a marker so that during reassembly they can be installed in the same place where they were. If this is not done, they will wear out faster and brake worse.
- bend the locking plates of the washers on the caliper mounting bolts;
- unscrew and remove the bolts securing the caliper to the steering knuckle;
- Remove the brake mechanism (caliper) of the VAZ 2107 from the brake disc.
Important: the upper and lower caliper mounting bolts differ in the shape of the head. When installing the unit in place, it is necessary not to mix them up.
How the repair is carried out
If the mechanism is damaged or there are deformations, it must be completely replaced. Repairing a VAZ 2107 caliper involves replacing non-working cylinders. The repair procedure is as follows:
- The device is fixed in the jaws of a vice.
- Unscrew the fastenings of the connecting metal tube. After this, the tube must be removed.
- Knock out the working cylinders from the guides.
- If there are none, remove the clamps and replace them with new cylinders.
- Place the cylinders in the guides, and then install the connecting tube, followed by tightening the fittings.
- If it is necessary to repair the brake cylinders on the caliper, then the essence of the repair actions is to change the rubber seals.
- To make repairs, you will need to remove the cylinder and then remove the rubber cap from the cylinder using a screwdriver.
- Press the piston out, then remove the sealing ring using a screwdriver.
- In place of the old ring you need to install a new one from the repair kit. The cylinder, as well as the piston and ring, must be lubricated with brake fluid.
- Install the piston into the mechanism cylinder.
Read, it may come in handy: How to choose brake pads
Important points
When repairing the brake system of a VAZ 2107, you should remember several very important nuances. Without mentioning them, this article would be incomplete. So:
- On later VAZ 2107 models, spring washers began to be installed under the fastening bolts of the brake brackets. They are thin and very easy to lose when removing the bracket. To prevent this from happening, it is advisable to spread some newspaper or rag under the caliper. If the puck does pop out, it will be much easier to find it;
- If the driver does not plan to change the brake pads when replacing the caliper, then before removing them they should be marked with a marker or chalk so that they can be installed in the same place during reassembly. If you change the original location of the pads, they will become unusable much faster;
- If the driver decides to leave the caliper in place and plans to change only the brake pads, then he will have to buy not one, but two sets of pads, since these parts are always changed on two wheels, and not on one. If you leave old pads on one of the wheels, this will inevitably lead to rapid wear and new problems in the operation of the brake system;
So, replacing a brake caliper is not at all as difficult a task as it might seem at first glance. The main thing that the driver should remember when changing this part is its extreme importance. If a mistake is made when installing the caliper or pads, this does not bode well for either the driver or the car. It is for this reason that the article described in as much detail as possible all the nuances of installing a brake caliper. And it is strongly recommended to pay close attention to these nuances.
The front wheels of the “Seven” are equipped with disc brakes that are highly efficient. Each of the components of the VAZ 2107 car has two working cylinders, which bring the pads together and clamp the part located between them. This causes the disk to stop rotating. During operation, parts wear out and the faulty caliper needs to be replaced with a new one.
Typically, the cause of unit failure is corrosion processes of the cylinder walls and piston. In a working mechanism, they are protected from moisture by special rubber cuffs. Damage to these elements leads to moisture getting inside; over time, the unit loses its mobility and requires replacement or qualified repairs. Restoring the brake mechanism can be done independently.
Installing the brake mechanism and bleeding the system
The restored caliper of a VAZ 2107 car is put on the disc and secured with bolts to the steering knuckle. The pads are inserted into the gap and fixed with guide springs; if necessary, parts are replaced with new ones. The brake hose and tube are installed in place, and the system is filled with fluid to the specified level. Repair of the brake mechanism ends with bleeding to remove it from the system.
This process on a VAZ 2107 car is carried out as follows: a hose of a suitable diameter is put on the nipple of the working cylinder. Its other end is lowered into a container with liquid. The assistant sits behind the wheel and presses the brake pedal several times and holds it in that position. Using the key, release the nipple and let out the air. We repeat this action until bubbles stop appearing in the container.
Dismantling the unit
To carry out repair work on the brake system of a VAZ 2107, you will need spare parts: a caliper assembly or a set of cylinders. Tools you will need: a set of keys, screwdrivers, pliers and a hammer. It is advisable to organize the work in a garage box; a portable lamp is used to illuminate the workplace. Repair of the brake system is carried out in the following order:
- The front part of the car is lifted with a jack and placed on a support, the wheels are removed.
- A thorough inspection of the caliper is carried out and it is cleaned of contaminants, using a key set to “17” we unscrew the bolt securing the brake hose and drain the liquid into a previously prepared container.
- Carefully move the brake pads apart using a screwdriver, applying force to the metal parts of the base. Using a drift of a suitable size, the guides are knocked out and the pads are pulled out.
- We unscrew the bolts securing the housing to the knuckle, thereby releasing the mechanism, and remove it from the brake disc.
Replacement of faulty cylinders installed in the caliper grooves is carried out by knocking it out. It is advisable to carry out repairs in a vice, having previously treated the grooves with a special penetrating liquid. Installing new cylinders usually does not cause any particular difficulties; they are inserted into the housing and driven all the way to the stop using a hammer and a soft metal drift.
Pressure regulator
It is installed in the rear wheel drive and not only distributes fluid to the mechanisms, it also prevents possible skidding due to different forces on the mechanisms. This is done by limiting the supply of pressure to the mechanisms, depending on the position of the car body relative to the bridge.
The regulator is driven by a rod, one end of which is fixed to the rear axle, while it itself is fixed to the body. As the load on the rear axle increases, the body changes position relative to the axle; as a result, the rod puts pressure on the regulator piston, which adjusts the pressure supplied to the mechanisms.
