Service of the Infiniti QX4 since 1996 of release
1. Introduction
2. Maintenance instruction
3. Routine maintenance
4. Engine
5. Cooling system and heating
6. Feed and control systems
7. Systems of start and charge
8. Transmission line
9. Brake system
9.1. Specifications
9.2. System of anti-blocking of brakes (ABS) - the general information and codes of malfunctions
9.3. Check of a state and replacement of brake lines and hoses
9.4. Replacement of blocks of disk brake mechanisms of forward wheels
9.5. Removal and installation of a support of the disk brake mechanism
9.6. Removal and installation of a brake disk
9.7. Replacement of brake boots of drum brake mechanisms of back wheels
9.8. Removal and installation of the main brake cylinder (MBC)
9.9. Removal and installation of assembly of the vacuum amplifier of brakes
9.10. Pumping of the brake system
9.11. Adjustment of the drive of the parking brake
9.12. Adjustments of a pedal of a foot brake
9.13. Adjustment of a spring of the valve regulator (LSV), sensitive to loading
9.14. Adjustment of sensors switches of stoplights and tempostata
9.15. Removal and installation of the ABS hydromodulator
9.16. Removal and installation of the G-sensor
9.17. Check of serviceability of functioning of wheel ABS sensors
9.18. Check of serviceability of functioning of the G-sensor
9.19. Check of serviceability of functioning of the relay of a driving electric motor of the hydromodulator
9.20. Check of serviceability of functioning of the relay of the electromagnetic valve of the hydraulic ABS modulator
10. Suspension bracket and steering
11. Body
12. Electric equipment
 












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9. Brake system

All models of the Infiniti cars are equipped with the hydraulic brake system with vacuum strengthening. On forward wheels disk brake mechanisms, on back — drum are always installed.

All brake mechanisms are equipped with self-regulators. At the same time compensation of wear of brake shoes of disk mechanisms is carried out automatically whereas, special adjusting devices which activation happens during braking, and also at raising of the parking brake are installed on drum brake mechanisms.

The dual design of the main brake cylinder (MBC) allows to break a hydraulic path into two, acting independently from each other, a contour (forward and back) (see an illustration the Function chart of a hydraulic path). In case of refusal one of contours, the second continues to work as before, providing adequate braking of the car. Violation of serviceability of functioning of any of contours, naturally, leads to decrease in efficiency of braking and is followed by operation of the corresponding control lamp on an instrument guard (see the Head of the Cooling system and heating) when squeezing a pedal of a foot brake.

The back brake contour is equipped with the valve regulator providing adjustment of hydraulic pressure at change of height of a road gleam of a back axis.

GTTs is established on the assembly of the servo-driver of the vacuum amplifier of brakes fixed on a back partition of a motive compartment. From above on the cylinder the big tank of hydraulic liquid equipped with a plastic cover is located. The tank fastens in the cylinder by means of plugs through passage and a cylindrical pin.

As it was already mentioned above, GTTs has the dual design providing functioning of two independent hydraulic contours. Liquid pressure in each of contours is forced by the individual piston in the main cylinder.

The servo-driver of the vacuum amplifier is fixed on a back partition of a motive compartment. The amplifier uses the depression created in the inlet pipeline for increase in efficiency of functioning of a hydraulic actuator of the brake system. From told clearly that the servo-driver functions only at the working engine that needs to be considered at towage of the car with the switched-off engine — resistance of a pedal of a foot brake to squeezing considerably increases, and the brake way increases.

The control lever of the parking brake is located in interior of the car and influences a draft rod to which couple of driving cables are attached (on one on each of brake mechanisms of back wheels). At raising of the lever cables delay the executive levers attached to assemblies of brake boots in mechanisms of both back wheels. At the same time boots get divorced in the parties, nestling on the working surface of reels. On models with disk brake mechanisms of back wheels levers are attached to actuation mechanisms of screw type in cases of supports. Levers influence pistons of supports, forcing blocks to nestle on brake disks.


Function chart of a hydraulic path


"on the page back
8.4.3. Check of a condition of driveshafts
on the following page"
9.1. Specifications




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