Manual MAZ 555102, 5551A2, 5551A3, 555142, 555145, 555147, 533702, 5337A2, 533703, 533742, 533745, 533747, 543302, 5433A2, 543403 2011 - page 28

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MAZ brakes - diagram, parking brake, manual - TD Spetsmash

Of course, the MAZ electrical circuit is one of the most difficult for ordinary drivers who do not have a special electrical engineering education to understand its principles. At the same time, Minsk-made cars have plenty of systems that are only slightly inferior in complexity to electrical devices. Such complex systems include the MAZ brake system. Moreover, its main difficulty is that it consists of several subsystems at once, different in structure, specific purpose (in some cases, subsystems perform the functions of their “brothers”) and in the principles of interaction with other subsystems. The standard MAZ brake circuit includes the following subgroups:

- working; - auxiliary; - spare; - parking.

Using the latter as an example, we will tell you what needs to be done to prevent problems in the system and prevent breakdowns...

The MAZ handbrake and its drive do not require special care, but some rules should be remembered:

• be sure to periodically inspect the drive cables and hinge joints for signs of wear, and if they appear, replace them immediately; • do not allow fastenings to loosen or connections to become dirty; • when lubrication, strictly adhere to the lubrication chart recommended by the manufacturer, but do not forget to make adjustments to it in case of deviations in operating conditions; • before each departure, additionally make sure that the MAZ parking brake functions without failure and is capable of holding the vehicle within the specified limits.

Optional equipment

Additional equipment includes electrical devices that serve the windshield wiper, heating and ventilation systems of the cabin.

The electric motors of the windshield wiper and heating system are not subject to maintenance during operation.

Electrical diagrams for Toyota MARK II / CHASER / CRESTA

Electrical equipment MAZ

Description and scope of application

The MAZ 53366 (021) model is a flatbed truck with a 4x2 wheel arrangement and a curb weight of 18 tons. The vehicle body has the form of a welded metal platform, with a wooden floor, equipped with folding sides at the rear and sides.

Exterior

MAZ 53366

The appearance of the MAZ of this series is quite standard and typical for its class. The car has a cabover cab (like the MAZ-500) of a strict rectangular design, equipped with two doors, and a rather massive, large radiator grille, painted in a darker or lighter shade, contrasting with the main tone of the vehicle.

In the central part there is the company logo of the plant. The bumper is strong and reliable, made of metal.

There is a plastic cover in the form of a visor above the windshield of the truck. Also, plastic elements are located on the side ribs of the front part of the cabin. The doors are large and equipped with special locking mechanisms.

The seriousness and “brutality” of the car are given by its massive wheels , sunk into the body, and strict, neat arches, with a special step for climbing into the cabin.

The dimensions and technical characteristics of the MAZ 53366 021 can be called very impressive and worthy of respect: Its length, including the cargo side, is 8.62 m, with a width of 2.5 m. The height of this “workhorse” is 3.16 m, the size of its wheelbase is – 4.9 m.

This is interesting: another distinctive quality of the model is its ground clearance, which is 260 mm, thanks to which 53366 feels great on difficult sections of the highway.

Interior

The driver's cabin is equipped with a sprung seat , adjustable in height and length, with the ability to change the angle of the backrest and cushion. The seating position is high, which, together with the presence of two large side mirrors, provides good visibility.

Driver's cabin

In general, the interior decoration of the car’s cabin can be called laconic. There are seats designed for the driver and one passenger, equipped with seat belts with three-point fixation. In addition, there are two “sleeping bags”, in the form of a bed and a hanging shelf.

If desired, you can install an additional partition in it, thereby separating the rest area from the main area.

The space between the driver and passenger seats is separated by a torpedo , smoothly flowing into the work panel, equipped with special compartments for documents and various small items.

The working panel has a sufficient number of necessary sensors and switches. There is a compartment for a radio with speakers.

The steering column , which is adjustable in height and tilt over a fairly wide range, deserves special attention

Simply put, everything is in moderation here. This is a reliable and easy car to work with. And this explains the wide range of areas of its use.

Trucks of this series are designed for transporting cargo of various purposes and types . Suitable for use as part of road trains. Used in a variety of manufacturing applications, including:

• Light and processing industry;
• Construction industry;
• Agriculture, etc.

Replacing linings

Brake pads consist of two parts: a metal body and a friction lining. Previously, about 40 years ago, the linings were made of asbestos-containing material, which was installed on a metal part using rivets. The service life of such parts was small and amounted to 40-50 thousand km. Today, new friction materials are used that can last 180-200 thousand km without replacement. Therefore, there is no point in replacing brake linings, and the pads are replaced as a set.

After removing the drum to dismantle the elements, you must perform the following steps:

• remove the spring that tightens the pads;
• dismantle the cups with springs that press the parts to the protective casing;
• remove the pads from their seats.

If you decide to replace only the friction linings, then in addition to the listed actions you must perform the following:

• dismantling the remaining friction material;
• cleaning the surface of the part;
• installation of new linings;
• processing on a lathe to the required size.

The installed material must have a thickness of at least 7 mm, with a margin of 3.5 mm to the rivet head. The gap between the friction material and the pad body is allowed no more than 0.1 mm. Such work can be performed without special devices using a bench vice in compliance with the required dimensions and tolerances.

Safety valves

The brake system of the MAZ-MAN rear suspension contains two protective valves: single and double, more details here https://avtotehnolog-tula.ru/productions/most_zadnij. The problems that arise in them are quite similar. Most often, mechanics are faced with an air leak through an atmospheric hole. If this happens in a single valve, then you should pay attention to the diaphragm: check whether it is tightened tightly and whether it is damaged.

Replace if necessary. In a double valve, the seal of the piston or check valve may be compromised. The mounting bolts may also become loose. It is necessary to carefully inspect all of the indicated elements, clean them from contamination, tighten the bolts and, if necessary, replace the rings or the entire valve.

Source

Adjustment

In serviceable and adjusted brakes, the gap between the lining and the inner surface of the drum should not exceed 0.4 mm. This corresponds to the movement of the TC rod by 25-40 mm. If this value increases to 45 mm or more, then adjustment of the brakes is necessary. Most drivers prefer to do this work with their own hands.

Adjustment work involves sequentially performing the following actions:

• placing the axle on a jack;
• releasing the worm screw of the adjusting lever from the locking plate;
• turning it until the rotating wheel begins to brake;
• rotation of the worm in the opposite direction by 1/3 of a turn, which will correspond to a rod stroke of 25-40 mm.
• return the stopper to its original position.

It must be remembered that the difference in stroke of the TC rod on one axis should not be more than 8 mm. Serviceable brake systems will ensure safe movement and parking of the car.

Malfunctions

When operating a vehicle, the following breakdowns may occur:

• low braking efficiency;
• uneven braking of the wheels of the right and left sides;
• jamming of service or parking brakes (brake jam);
• increased travel of the parking brake handle.

An increase in braking distance can occur due to a large gap between the pads and the brake drum (TB), due to wear of the pads or insufficient output of the rod at low pressure in the pneumatic system. If such a malfunction appears after repairs associated with replacing the pads, then there is a high probability of oiling of the friction material or the inner surface of the brake pad.

In most cases, a car skidding during braking occurs due to a large difference in the strokes of the brake rods installed on one axis or the shaft getting stuck in the expansion cam bushings in the brake pad block.

Slow release most often occurs due to a broken or stuck return spring in the brake cylinder. The cause of such a defect may also be incorrect adjustment of the brake pedal. Therefore, the brake valve lever does not reach the stop. Due to the breakdown of the brake pad tension springs, spontaneous braking may occur, and a characteristic knocking sound in the wheel will be heard when driving.

When driving a truck with a trailer, there may be a delay in the latter's braking. This is due to incorrect installation of the adjusting ring in the brake valve. The same failure is typical for a stuck piston in the trailer air distributor.

It must be remembered that a breakdown in the steering will only lead to a loss of control of the car, and a vehicle failure will lead to the impossibility of stopping it, which will inevitably end in an accident.