 printable version
Overview
Braking system with hydraulic drive consists of two independent circuits, divided diagonally (left front - right rear, right front - left rear wheel). Front brakes with ventilated discs, rear - drum. The structure of a hydraulic drive of working brake system includes a brake master cylinder pressure regulator rear brakes, vacuum booster and, depending on the version, the anti-lock system (ABS). If you have used ABS disc rear brakes. Pressure regulators for vehicles with ABS installed on the rear axle. On vehicles with a diesel engine in the braking system also includes a vacuum pump.
| Fig. 7.1. Front brake type CL22VD and CL22VE: 1 - guide pins; 5 - a protective cover; 3 - directing the brake pads; 4 - Disc; 5 - the pressure pad insert; 6 - brake shoes; 7 - the pressure of the spring; 8 - Noise reduction gasket; 9 - the bolt pin; 10 - bleed screw; 11 - Caliper; 12 - a sealing ring; 13 - the piston; 14 - Dirt cuff.
|
Front brake specifications shown in Table. 7.1.
Table 7.1 Features Front brake Characteristic | Engine GA14DE | Engines GA16DE, CD20 | Type | CL22VD | CL22VE | The diameter of the piston of the wheel cylinder, mm | 54 | The outer diameter of the brake disc, mm | 232 | 247 | The thickness of the disc, mm: | ?� | Rated | 18 | minimum allowable | 16 | The axial run-out of the working surface of the disk, no more, mm | 0.07 | Uneven thickness of the disc, no more, mm | 0.02 | Length / width of the brake pads, mm | 106 / 39.5 | The thickness of the friction lining, mm: | ?� | Rated | eleven | minimum allowable | 2 | Brand friction linings | Akebono AP55HFF |
| Fig. 7.2. Drum Brake Rear Wheel type LT18C: 1 - dust lip; 2 - piston; 3 - cuff; 4 - brake cylinder; 5 - bleed screw; 6 - a spring; 7 - the parking brake cable; 8, 12, 13 - support leg pads with a spring and a cup; 9 - Brake shield; 10 - release lever; 11 - extractor brake shoes; 14 - the bottom coupling spring pad; 15 - a spring mechanism for automatic adjustment of the gap; 16 - brake drum; 17 - pressing the brake pad; 18 - mechanism for automatic adjustment of the gap; 19 - the top coupling spring pad
|
Rear brake drum, such LT18C, with automatic clearance adjustment mechanism and a built-in parking brake. The inner diameter of the brake cylinder 15,87 mm, inner drum diameter 180 mm, maximum permissible boring after 181 mm; roundness of the drum is not more than 0.03 mm. The length of the friction linings 172 mm, width 30 mm. The thickness of the friction linings brand Akebono A90TEE 4 mm, the minimum allowable - 1.5 mm. Drum brake apparatus shown in Fig. 7.2.
| Fig. 7.3. Disc rear brakes type CL7HB: 1 - the parking brake lever; 2 - O-ring; 3 - a lock ring; 4 - spacer; 5 - shaped washer; 6 - the bearing; 7 - the piston rod; 8 - piston; 9 - dust lip; 10 - a sealing ring; 11 - stock; 12 - thrust washer; 13 - a spring; 14 - pressure spring; 15 - the pressure pad pad; 16 - the guide pin bolts; 17 - directing fingers of brake pads; 18 - protective covers fingers; 19 - directing the brake pads; 20 - Disc; 21 --protection pad; 22 - the brake pads
|
For vehicles with ABS installed disc rear brakes type CL7HB, single-piston, floating caliper (Fig. 7.3). The diameter of the piston of the wheel cylinder 30.23 mm. The outer diameter of the brake disc 234 mm. Nominal thickness of the disc 7 mm, the minimum allowable 6 mm. The length of the brake pads 94 mm, width 29 mm. The thickness of the friction linings 10 mm, the minimum allowed for the wear of 1.5 mm. Brand friction pads Akebono AP52FF. The main brake cylinder has two series working piston and two built-in pressure regulator rear brakes (version without ABS). Bore, mm without ABS 20,64 with ABS 22,22 The braking pressure front / rear brake, MPa: without ABS 6,5 / 3,5-3,9 with ABS 7,5 / 5,2-5,6 Servo marks N195T double action. The diameter of the aperture of the primary circuit 205 mm, 180 mm in the secondary circuit. The distance from the floor to the pedal body (in the free state when force is 490-500 N): Cars with manual transmission - no less than 148-158 / 75 mm; Cars with automatic transmission - no less than 157-167 / 85 mm.
| Fig. 7.4. Details of the vacuum amplifier models with diesel engine: A - motor CD20; B - motor CD20E (issued in April 1996): 1 - the generator; 2 - O-ring; 3 - a rotor; 4 - vane; 5 - the case of the vacuum pump; 6 - a vacuum hose; 7 - the switch; 8 - Hose clamps; 9 - Cover; 10 - vacuum pump; 11 - a drain oil line; 12 - Battery dilution; 13 - supply oil line
|
Vacuum pump for diesel engines mounted behind CD20 generator shaft. On diesel engines CD20E vacuum pump is mounted on the cylinder head and is driven by the camshaft. Details of the vacuum amplifier shown in Fig. 7.4. The parking brake system with manual rope acts on the brakes of the rear wheels. Lever when a force of 200 N should move 7-8 teeth ratchet. Anti-lock brakes brand Nippon Denso with electronic control unit can be mounted on all models of cars. The structure includes ABS: - An electronic control unit integrated in the hydraulic unit, located in the front of the engine compartment on the left. The electronic control unit (ECU) controls the solenoid valve using the pressure in the brake mechanisms, preventing the wheels from locking. The appearance of the tendency to lock one or more wheels is determined by the rotational speed sensors of the front and rear wheels. Also, the computer receives information about the brake pedal is depressed by the brake light switch; - Four inductive speed sensor front and rear wheels; - Relay control and protection against voltage surges in the on-board network; - Warning light system is located in the instrument cluster.
| Fig. 7.18. Bolt speed sensor front wheel 1 - the place to check the clearance sensor
|
| Fig. 7.22. Backlash check speed sensor of the rear wheel
|
- Speed sensors front and rear wheels of the inductive type, are mounted on the steering knuckle of the front wheels and the rear axle of the hub opposite the toothed rotor. Resistance sensors 800-1200 ohms. The air gap (see. Fig. 7.18, 7.22) is 0.1-1.1 mm, and can not be adjusted; - Hydraulic unit is located near the upper right-hand front mounting strut. It consists of eight electromagnetic control valves, the electric power is turned on and the relay mounted on the relay box.
| 
