Frog brake Maz 5440

MAZ brake pedal position sensor

A modern MAZ brake pedal position sensor is a technical device that allows you to control the degree of impact on the brake pedal. After prolonged use, the device may wear out. If you notice a malfunction of the MAZ sensor, replace it with a new part. The MAZ catalog contains the widest range of original components and their analogues.

Availability, price and equipment can be easily checked by calling your MAZ dealer [phone].

How to check the operation of the MAZ brake pedal position sensor?

To test the system, do the following:

• Ring the entire node with a multimeter;
• Disassemble the part and inspect all its components;
• We change the MAZ sensor to a new part.

The marking process consists of sequentially measuring the contacts of the device.

Contacts are checked in pairs and individually. During a visual inspection of the components after disassembly, a broken spring, oxidation and contamination of the contact plate are most often detected.

In the latter case, for normal operation of the sensor, it is enough to clean the plate. Quite often excessive mobility of contact comes to light.

Malfunctions and adjustment of the MAZ pedal sensor

Signs of a breakdown of the MAZ brake pedal position sensor are:

• The appearance of the corresponding error on the panel;
• A noticeable decrease in the responsiveness of the power plant;
• A short-term increase in engine speed at the time of gear shifting.

To adjust the MAZ pedal sensor, it is necessary to screw the part before lowering the pedal.

Then the mechanism is slightly unscrewed and fixed with a nut. The position is considered normal when, at the moment the pedal is not pressed, the sensor rod is buried in the body, and when it is set, the pedal is completely released.

The working gap is regulated by nuts: the upper one is screwed on, and the lower one is unscrewed.

It is very important that the stroke clearance remains between 2 and 5 mm. Starting work with an auto electrician, you need to remove the negative terminal of the battery.

The choice of the MAZ brake pedal position sensor is simple. However, if you do not know which sensor to buy, call our store specialist. We will advise you in choosing, arrange delivery and offer favorable prices for spare parts for MAZ trucks.

Source

Frog brake MAZ 5440

MAZ vehicles are constantly subjected to heavy loads. Often their work is round-the-clock, and drivers do not always have time to track the malfunctions that occur. Usually they are detected when the first signs of trouble appear. Unfortunately, today, not all car owners carry out timely maintenance of the car. Neglect of diagnostics and necessary repairs can create risks for the life and health of the driver, as well as for the safety of the cargo.

Auto repair shop "Alfa-Avto" offers its services for diagnostics, repair, replacement of spare parts and tuning of MAZ vehicles. Such procedures may be necessary after a traffic accident, when parts are worn out that affect the operation of the entire mechanism or system, as well as in case of a simple breakdown due to the driver’s inattention.

If we are talking about replacing the brake light switch, then the driver understands that it is time to dismantle the existing “frog”. It is located on the driver's seat next to the brake pedal and next to the steering shaft. Often the timely operation of the brake lights depends on the correct operation of the switch. The replacement of a damaged element occurs according to a certain algorithm, and the first thing the master does is turn off the electronics.

• Then the fixing elements are loosened, holding the spare part in a static position;
• Pressing the pedal with one hand, the master continues to remove the fasteners of the “frog” No.
• The final removal of the switch does not require additional effort, as the element easily leaves the system.

Replacement of a part is carried out taking into account the same steps performed in reverse order. At the end of the work, the master checks the quality of fastening of all previously dismantled objects and, for prevention, checks the ignition of the brake light. The moment of ignition of the mechanism must be clearly adjusted.

The cost of a new part of this type is low and affordable for any car owner. In order not to waste time looking for the right thing, trust our specialists. Alfa-Auto masters carry out repair work using affordable high-quality original and analog spare parts.

 

Where is the brake frog on Maza

Came to repair. Problem: Rear brake lights stay on all the time.

The search for traffic light frogs led to their location on a loom near the central bridge.

 

disconnecting them did not solve the problem, checking the wiring in the cabin revealed heating of the ground wire to the fuse box. Only he melts and walks in a braid, which is used for strands of a semaphore frog.

Total: remove the braid from the batteries and replace the cable with a new one, gluing the repair of the remaining cores.

The reason: the low nominal weight of the battery before the internal combustion engine when starting the starter, it takes a long time to pump fuel, then there is not enough native mass and all the ground wires that are tied to the battery start to heat up.

Recommendations: Additional mass transfer from the battery to the frame and engine. The cross section is at least 20-25 mm.

Tractors of the MAZ model are very popular among motorists due to their reliability and affordable cost. This car has been produced at a specialized plant in the city of Minsk since 1988.

The car is equipped with a large cab, which is easy to maneuver. There are two comfortable chairs in the living room. If necessary, the cab can be tilted back thanks to the presence of a manually operated hydraulic cylinder. Automotive equipment is distinguished by increased reliability and durability, especially when transporting bulky goods over long distances.

The MAZ brake system is the main unit of the car. When certain malfunctions are detected, the driver loses confidence in his own safety. In this case, do not neglect the repair and seek help from a specialist as soon as possible.

MAZ vehicles have four systems at once, which are quite closely interconnected. Among them it is worth noting:

• Working.
• System replacement (included in the work after the first failure).
• Parking system (in case of a breakdown, the car will not stop and there will be problems with parking).
• Auxiliary (turns off the engine).

System types

In addition, it is also necessary to mention the presence of a semi-trailer brake system, which is equipped with special pneumatic actuators designed to control other systems operating on compressed air.

Its advantage is that it blocks all available MAZ wheels. The presence of a pneumatic drive with separate braking allows you to stop a pair of front and rear wheels.

The main function of the spare brakes and parking brakes is to act on the mechanisms of the axles, which are actuated by the action of chambers and spring energy accumulators, actuated by the driver of the vehicle using a special crane located in the cab.

The parking system is considered optional and is used as a last resort, such as when service brakes fail or fail for various reasons. During its activation, it is necessary to put the crane handle in the extreme position.

The air that compresses the springs enters the atmosphere and other mechanisms begin to work, including the parking brake. At the moment the emergency braking system is activated, the control valve handle must be in the center, no additional efforts are required to move it. It is important to know that as the number of crank turns increases, the braking force increases by reducing the air acting on the springs.

Auxiliary braking

This type of system works by using gases that enter the car's system. Its main function is to stop and hold the MAZ on steep roads.

combined with parking for greater comfort and security. The auxiliary brake is a special motor-pneumatic retarder. The semi-trailer brake drive consists of two-wire and single-wire elements. In winter, you can deal with the fact that the condensate freezes, especially in large MAZ vehicles, but here the developers have thought of everything and made the car safe by introducing a fuse that eliminates this problem.

The car also has a setting to reduce traffic. It consists of a special cylinder and valve system. To all this, an anti-slip system is added. To turn it on, you need to use a special button.

Traction control and speed limiting systems contribute to the supply of compressed air, which is provided by a proportional valve. It is important to note that with simultaneous braking, the MAZ and the semi-trailer stop, because these systems are interconnected.

Brake mechanisms

All MAZ models have drum mechanisms with a diameter of 42 centimeters and a width of 16 centimeters. In addition, the system is equipped with a double-circuit pneumatic drive. The brake chambers located at the rear of the tractor have spring-loaded energy accumulators.

Handbrake

The brake valve is a special drive required to supply air to the chambers and act on the stop pedal. For example, MAZ-500A has a combined crane that works simultaneously with the trailer and helps with its braking. This crane is equipped with two cylinders. The first is necessary to check the trailer brakes, the second helps to reduce the speed of the truck.

See also: brake master cylinder

The trailer braking system has some features, that is, when the pressure rises to the limit mark of 0,48-0,53 MPa, the wheels are released and, conversely, braking decreases.

The brake valve is equipped with cylinders in which pistons are cast, surrounded by rubber bushings located on the spokes. There are rubber valves on the back of the faucet body that perform a dual function.

The car owner must know that in order for the trailer not to pass through the car and not slide along the rear axle of the trailer and, as a result, the MAZ does not bend in half, it is important to monitor the correct braking of the trailer wheel, and then the car. In this case, it is recommended to focus on the trailer brakes in order to change the advance value and adjust the tension using the mode ring.

When working with an impeller, axial movement can be achieved with a bolt through an adjusting sleeve. This will change the spring tension and the bushing will loosen.

Having chosen a stepped ring and springs, it is necessary to establish the ratio and normalize the pressure in the brake chambers of the car. The constant values ​​in the cavities change over time, the sections in the crane move when the brake pedal changes, that is, after it moves from one position to another, but, in spite of everything, the relationship remains unchanged.

When the car stops, the force from the parking lever is transferred to the upper cylindrical area of ​​the piston, the trailer brakes in the same way as when the pedal is pressed. Car owners should remember that semi-trailers and trailers can be equipped with a compressed air receiver, through which compressed air is supplied to the track. An equally important detail: an air distributor is installed on the trailer, and the brake valve on it has a close connection with the air distributor.

Service of the brake system

Each MAZ owner should know some basic rules for off-season maintenance of his car in order to avoid freezing of its individual parts and mechanisms, we will talk about the pneumatic drive.

1. it is necessary to blow out the water separator well so that the liquid in it does not freeze.
2. Thoroughly clean the water separator and antifreeze tank, which should be filled with a small amount of alcohol.
3. Don't forget to raise the antifreeze handle.

The operation of a truck brake is not subject to constant maintenance or adjustment, but with the slightest malfunction, it must be urgently replaced, the defects eliminated, and not independently, but under the supervision of a specialist. Otherwise, if you install it incorrectly or make a mistake on the road, an emergency situation may arise, the consequences of which will be catastrophic. It is important for preventive purposes to go to a car dealership to check the diagnostics of the entire complex MAZ system.

 

 

The brake light is designed to alert drivers behind them to stop. It should light up as soon as you press the brake pedal. If the bumper is defective, it could lead to an accident. The article discusses a brake light, the principle of operation, typical malfunctions, ways to eliminate them, and also gives instructions for replacing them with your own hands.

The principle of operation of the brake light

The brake lights are located at the rear of the car. Lanterns are red. They turn on automatically if the driver slows down. When the driver takes his foot off the brake pedal, they automatically disengage. Stops for cars are required.

Lanterns should be located symmetrically and shine brighter than marker lights. Stoplights are installed on the sides, in the rear window, in the middle above the side stop line.

The primary and secondary brake lights can be a single bulb, a neon tube, or a set of LED bulbs. Also, the motorist is equipped with a brake light amplifier. The rear brake light can also work as a fog light. You can install a formula 1 brake light (video by Mikhail Ermolaev).

The simplest brake light includes a switch (switch) and a lamp. The brake light switch is also known as the frog. The plastic housing of the switch contains two terminals, a stem and a spring. This device is installed on the brake pedal.

When the driver presses the pedal, the plunger enters the switch housing, the contact closes and the warning light comes on. As soon as the driver takes his foot off the brake pedal, the spring pushes the rod, the contacts open and the light goes out.

See also: No pressure in the VAZ brake system

LED legs consist of a chip and a sensor, which in this case is a crosspiece that gives a signal when the driver presses the brake. As with the single lamp, the belt is attached under the brake pedal.

Foot control scheme

Each pedal has free play. Therefore, even if the driver presses the pedal, the car does not immediately brake. The brake light comes on when you press the brake pedal. Drivers of following vehicles know they are braking before the vehicle starts to brake. They then have time to prepare for braking.

Possible malfunctions: symptoms and causes

If the feet do not burn, the reason may be as follows:

• bad contacts;
• damage to the wiring located in the corrugation between the door and the body;
• burned out headlights.

There is a situation when the brake lights are constantly on if the parking lights are on. In this case, the headlights may not turn on. If they are off, the auxiliary lights work normally.

• short circuit in side lights and blocking contacts;
• weightless in size;
• defective two-pin lamp;
• the circuit is closed, but there is no opening.

If the position and brake lights are on, and the ignition is off, it is necessary to check the short circuit to the body lights. The reason may be poor contact of the negative cable with the ground.

Ways to eliminate breakage

Troubleshooting is a simple and quite affordable process even for novice drivers (the author of the video is KV Avtoelectric).

First of all, you need to check the integrity and condition of the wiring.

Play around with the wiring with a multimeter. Damaged or broken sections must be completely replaced or welded. If traces of oxidative processes remain on the contacts, they must be cleaned.

If the LEDs are burned out, they should be replaced in pairs. If the switch fails, it must be replaced with a new one, as it cannot be repaired. Before replacing, turn off the vehicle by removing the negative battery terminal. Then, disconnect the power cables from the switch. Next, you need to loosen the lock nut and unscrew the main nut that secures the switch to the bracket.

Stoplight Switch Replacement

Before installing a new frog, it is necessary to check its performance. This can be done with an ohmmeter. We connect the device to the device and measure the resistance. When the contact is closed, the resistance should be zero. When the rod is pressed, the contacts should open, while the resistance tends to infinity.

Replacing the stop repeater with your own hands

If the repeater is beyond repair, it must be replaced.

The replacement process includes the following steps:

1. Using a wrench, unscrew the fasteners on the back of the foot and remove it.
2. Then we connect the positive wire of the lamp to the terminal where the brake light frog is located. To do this, you need to bring the cable to the trunk, unscrew the trim on the right side and connect it to the desired terminal. A deadbolt in the trunk can act as a negative sign.
3. Heat shrink must be applied to the wiring. To prevent the wires from hanging out, they must be fixed with electrical tape.
4. The final step is to check the performance of the device.

Photos

If the car has an incandescent lamp repeater, then when connecting a device with LEDs according to the above diagram, the lamp control will not work correctly due to different loads. In this case, take the positive lead to the lighting control unit and connect it to terminal 54H.

As a brake light, a strip with LEDs can be glued on the entire length of the rear window. It should be connected to a standard device and will work the same way. It is important to observe the polarity. To avoid the obvious, the tape can be dyed black. Stick the tape on double sided tape. Let's check the functionality.

Conclusion

To protect yourself and other road users, you should monitor the serviceability of your brake lights.

If faults are found, they must be repaired immediately. Many operations can be done by hand. Thus, you will save time and money on visiting gas stations. But if there is no experience in electrical work, it is better to trust the master.