A fully operational brake system of a VAZ 2107 car is a key element in ensuring safe movement in a car for both passengers and the driver. Therefore, you should pay special attention to it, and if minor signs of malfunction appear, begin repairs immediately.
The brake master cylinder is one of the main elements of the car's braking system. Basically it can have two faults. The first is the appearance of a fluid leak from the main brake, the second is a decrease in the effectiveness of the brakes, which can be determined by the failure of the pedal or its “softness”. Both of these faults can be eliminated by a not very complicated repair of the main brake; this repair consists of replacing the o-rings and boot, but in some cases the problem can only be solved by replacing the cylinder.
↑ Removing and installing the main brake cylinder
- Disconnect the flexible hoses from the master cylinder and cover the hose openings and fittings on the cylinder to prevent fluid from leaking from the reservoir and preventing dust and dirt from entering the cylinder.
- Disconnect the steel pipes from the master cylinder that drain fluid to the wheel cylinders of the front and rear brakes, first unscrewing the pipe nuts.
- Remove the cylinder by unscrewing the nuts securing it to the vacuum booster.
Install the master cylinder in the reverse order of removal. After installing the cylinder, bleed the brake system to remove air from it.
How to bleed the brakes on a VAZ 2107 yourself Video, photo
The brake system, like all automotive systems, requires periodic inspection and maintenance. In addition to monitoring the condition of the brake pads, it is necessary to periodically remove air bubbles that appear in the brake fluid. To remove air, the system must be bled. The operation can be performed without contacting service station specialists. This does not require special knowledge or qualifications. You will need a special tool and an assistant.
When is it necessary to pump the brakes of a VAZ 2107
It is necessary to bleed the brake system in four cases:
- Replacing brake fluid. Brake fluid has a limited service life. Over time, it absorbs moisture from the air, which can cause corrosion of the surface of the brake cylinders and their failure. Water also worsens the main property of brake fluid - it reduces the boiling point.
- The recommended service life of brake fluid on VAZ cars is 2 years, after which it is worth replacing it. This applies to standard glycol-based brake fluid.
- Troubleshooting the brake system. When replacing brake hoses and cylinders, brake fluid leaks and air enters the system. Therefore, after repair work, the VAZ 2107 brakes must be bled.
- Air ingress during operation. This manifests itself in deterioration in braking efficiency, a “soft pedal” or uneven braking of individual wheels.
What is needed to bleed the brake system
It is almost impossible to bleed the brake system yourself. The work is carried out by two people. One person (“mechanic”) works with the brake system, unscrews the fittings. The second (“partner”) is located inside the car and must press or release the brake pedal on command.
You also need the following tools:
- 8/10 socket wrench;
- a PVC tube or rubber hose, the inner diameter of which corresponds to the diameter of the fitting;
- container for collecting waste liquid.
- Brake fluid is also needed.
If cars are equipped with 8-mm wrench fittings, it is better to replace them with similar 10-mm hexagon fittings. The latter will subsequently be easier to unscrew without tearing off the edges.
How to bleed the brakes on a VAZ 2107
For ease of work and to ensure free access to the brake cylinder fittings, you should use an inspection hole. The design of the front brake mechanisms requires removal of the wheels to bleed the brake system.
Before starting work, it is necessary to fill the brake reservoir to the maximum, and during bleeding, you must ensure that it is constantly filled with brake fluid. If you miss this moment, air will get into the working cylinder and you will have to start work again.
The procedure for each of the 4 working cylinders is as follows:
- Remove the protective cap from the fitting.
- Loosen the fitting using a spanner. If the fitting has not been unscrewed for a long time, significant effort may be required. You must be especially careful not to damage the edges, otherwise the work may become very difficult, even to the point that the brake cylinder will need to be replaced.
- Place the tube on the fitting and lower it into the brake fluid container.
Direct pumping is performed as follows:
- The “partner” sitting in the cabin, at the command of the “mechanic”, presses the pedal all the way.
- The “mechanic” unscrews the fitting half a turn so that the liquid, along with air bubbles, comes out into the container through the inserted tube. The brake pedal “sinks” to the floor.
- The “fitter” tightens the fitting, and the “partner” releases the pedal on command.
The procedure is repeated until no more air bubbles come out of the tube. During bleeding, the end of the tube must be constantly lowered into the brake fluid so that air does not enter the cylinder.
In this way, all four working brake cylinders are pumped. A certain sequence should be followed when bleeding the cylinders. They are pumped “from far to near”:
- Right rear.
- Left back.
- Right front.
- Left front.
After completing bleeding of each cylinder, it is necessary to tighten the fitting and put on the protective cap.
Bleeding the brakes of a VAZ 2107 is quite feasible at home and does not require expensive special tools and devices. No special qualifications are required either. Even a child can release and press the brake pedal at the “locksmith’s” command.
Often, owners upgrade the brake system by installing more efficient, high-quality and expensive parts. However, this does not change the bleeding method in any way and does not eliminate the need for periodic work to replace the brake fluid.
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↑ Design of the main cylinder of the hydraulic brake drive
1 - plug; 2 — cylinder body; 3 — rear brake drive piston; 4 — washer; 5 — front brake drive piston; 6 - sealing ring; 7 — locking screws; 8 — piston return springs; 9 — spring plate; 10 — pressure spring of the sealing ring; 11 — spacer ring; 12 — inlet; A - compensation hole (gaps between sealing ring 6, spacer ring 11 and piston 5)
Symptoms of a GTZ malfunction
The first signs of a brake malfunction, and sometimes the only reason why replacing the master brake cylinder of a VAZ 2107 is necessary, is a signal that is simple and understandable to any teapot - a red lamp on the instrument panel. It will tell a careless driver that the level of brake fluid in the reservoir is critically low. There is no need to panic right away. Perhaps the fluid began to drain a long time ago, and if you fill the tank to the MAX mark, the car will be able to last for some time without repair. However, if the fluid level drops again, then repairs are necessary.
Diagnostics of the brake system is simple and straightforward - if there are leaks on the main cylinder itself, it needs to be replaced or repaired. Its price is about 500 rubles assembled, regardless of the manufacturer, and can fluctuate within hundreds, depending on the greed of the seller. The most desperate car enthusiasts disassemble the master brake cylinder and try to change the cuffs and seals. Often this leads to the expected result, but only if you managed to buy a good complete repair kit with all seals, gaskets and cuffs.
↑ Parts of the brake master cylinder
1 - cylinder body; 2 — lock washer; 3 - fitting; 4 - sealing gasket; 5 - sealing washer; 6 — piston lock screw; 7 — piston return springs; 8 - cup; 9 — pressure spring of the sealing ring; 10 - sealing ring; 11 — spacer ring; 12 — rear brake drive piston; 13 — washer; 14 — front brake drive piston.
Unscrew the locking screws 7 and remove all the parts in the order shown in Fig.
What needs to be done to maintain full functionality of the stopping system
A week later, or after completing a run of 500 km.
IntroductionPurpose, design, principle of operation of the brake system of the VAZ 2112
1. Checking the pressure indicators in the wheels.
2. Diagnostics of the level and condition of the working mixture in the brake system.
As you know, the mixture has an important role in the system. The use of low-quality or used fluid leads to premature wear of the components of the shutdown system.
3. Diagnosis of the sensitivity of the brake pedal and checking the smoothness of its movement.
4. Diagnostics of the performance of brake lights and warning lamps.
1. Diagnostics of front brake axle components.
2. Checking the tightness of the system conductors.
Every year or after completing 20,000 km.
1. Diagnostics of the rear brake axle.
2. Diagnostics of the brake pedal bracket and check of the working bushings.
3. Thorough diagnostics of the condition of the working fluid in the system. Replace brake fluid when used.
After two years or after completing a mileage of 50,000 km.
GTZ as part of a car
1. Forced replacement of the working mixture.
2. Diagnosis of GTZ. During the inspection, it is necessary to examine the system element for leaks and seal failures.
After five years or 120,000 km.
1. Repair of the GTZ, overhaul of calipers and wheel cylinders.
During the operation of the vehicle, it is also necessary to pay due attention to the condition of the discs and pads. Pads must be changed if the maximum permissible wear is exceeded
The level of permissible wear is indicated by the manufacturer of certain pads.
In this article we will take a closer look at one of the most important stages of brake system maintenance - replacing and bleeding the master cylinder. But, first, let’s get acquainted with the structure and operating principle of this element, as well as its purpose in a vehicle.
The main role of the GTZ in the vehicle system is the conversion of the energy placed by the motorist on the brake pedal.
Malfunctions occurring in the brakes
From time to time, various malfunctions occur in the vehicle, and the working and master cylinders also often fail. The following breakdowns occur at the RTC:
- the piston gets stuck in one of the positions;
- the inner surface wears out;
- The sealing cuffs fail (tear or swell).
The main sign of a faulty condition is the appearance of smudges (leaks) of brake fluid (FL) from the RTC. If the pads are worn down to bare metal, the pistons in the RTC extend too far, and as a result, the brake fluid may leak and the brakes will fail.
In the GTZ, the piston can also jam, the internal cavity of the mechanism can wear out or rust, and the cuffs can leak. Symptoms of a GTZ malfunction are as follows:
- when braking, the brake pedal (BP) “fails”, the effectiveness of pressing disappears, this usually happens when there is a small leak from the turbocharger;
- braking occurs at the very end of the pedal stroke, and you have to press the PT several times to brake;
- there are no brakes on the front or rear wheels, this happens if one of the GTZ circuits does not work.
You cannot drive with faulty working and master brake cylinders; the parts should be replaced immediately.
Necessary tools and spare parts
Repairing your car yourself allows you to save money and gain experience in car maintenance. Having a minimum set of tools allows you to repair most components and parts of the “four”. To replace the GTZ you will need the following tools:
- Keys at 10, 13, 17;
- Pliers;
- Rags and brush to remove dirt;
- Device for unscrewing fittings;
- Brake fluid and syringe for pumping it out;
- New GTZ.
If there are problems with this element, it is recommended to change the assembly mechanism, because Repair kits when installed in an old cylinder body will not give the desired result, because development inside it will not allow the new part to return to efficiency.
Leveling up
After replacing any cylinder in the vehicle, it is necessary to bleed the brakes. Bleeding on any car always begins with the furthest wheel from the GTZ. On all VAZ cars, first of all, they start pumping the brakes from the rear right wheel, then move to the rear left, right front, and the front left wheel is pumped last. If the brake pedal takes at the very end or is hard, bleeding should be repeated, the work should be done according to the same scheme again.
