Description of the design of the brake system Vehicle braking system «BMW-X5», with body «E53», hydraulic with a foot drive and consists of two independent subsystems - a working (foot) and parking...
Brake Fluid — General Considerations Brake fluid is poisonous and precautions should be taken: do not suck the brake fluid through the hose from the container; brake fluid damages the paintwork...
Work carried out on the brake system The brake system is one of the most important safety systems of a car, so all work on it must be carried out especially carefully and taking into account the...
Specifications of the brake system Table 11.1. Specifications of the brake system Part parameter Size, mm Nominal Ultimate Caliper Brake Piston Diameter 60 – Front brake pad thickness 14 8...
Checking the brake system on a diagnostic stand Checking the brake system on a diagnostic stand with running drums gives the most clear picture of the state of the brake mechanisms, and is carried out in...
Checking the brake system with pressure and vacuum Attention! The pressure and vacuum test of the brake system must be carried out with the engine switched off. Checking the brake system with excessive pressure...
The disc brake mechanism of the car The principal design of the disc brake mechanism of the front wheels is shown in Figure 11.4, the rear wheels in Figure 11.5.
Replacing the wheel brake pads The removal of the brake pads is preceded by an indication on the instrument panel that they have reached the minimum thickness and control of the pad size...
Replacing the brake caliper Removing the front wheel brake caliper (right or left) must be done in the following order. Put the front of the car on stands and remove the front wheel....
Brake caliper overhaul The bulkhead of the brake caliper of the front wheel must be carried out in the following order. Prepare fixture «34.1.131» and a repair kit of spare parts....
Brake disc replacement The design of the brake discs is shown in Figure 11.4 - the front brake mechanism and in Figure 11.5 - the rear brake mechanism. Attention! The brake disc is...
Front disc — removal and installation Removing the brake discs of the front wheels must be carried out in the following order. Remove the wheels from the car and unscrew the two bolts (1, fig....
Rear disc — removal and installation Removing the brake discs of the rear wheels should be carried out in a similar manner, while taking into account the fastening of the brake caliper (pic....
Checking the thickness of the brake disc Checking the thickness of the brake disc (pic. 11.30) carry out with the wheel removed. In this case, it is necessary to use a special caliper, or a regular...
Grinding brake discs Attention! Brake discs made of composite materials cannot be machined. Brake discs are always ground on both wheels on both sides for one axle, observing the...
Parking brake — design description The parking brake with a manual drive and a drum brake mechanism has its own design features, because. rear axle brake discs play the role of parking brake...
Parking brake adjustment Attention! The cable drive and all moving parts of the parking brake system must be easy to move. The parking brake must be run in before adjustment. On an...
Removal and installation of the parking brake lever Removing the lever (1, see fig. 11.32) the parking brake must be carried out in the following order. Remove the bellows for the parking brake lever and the...
Replacing parking brake pads Attention! The parking brake pads must be replaced on both wheels at the same time. Removing the parking brake pads must be carried out in the following order....
Replacing Both Hand Brake Cables The replacement of both cables of the manual drive of the parking brake must be carried out in the following order. Prepare fixture «34.1.030», remove the...
Compensation tank replacement Removal of the compensation tank must be carried out in the following order. Remove the shield in the trunk and disconnect the connection jumper from the body...
Replacing the master brake cylinder The design of the main brake cylinder is shown in Figure 11.44. Removal of the main brake cylinder must be carried out in the following order. Remove the...
Checking the brake booster Attention! On a vehicle with a diesel engine, the vacuum is created by a specially installed vacuum pump. Vacuum-type brake booster is designed to create...
Replacing the vacuum booster Attention! Before replacing the vacuum booster, the vacuum line check valve must be replaced, as the diaphragm in the brake booster may be damaged by...
Replacement of brake pipelines Attention! On vehicles equipped with «ASC+T/DSC» it is forbidden to disconnect the pipelines connecting to the hydraulic unit and the main brake cylinder. In...
Replacement of brake hoses Attention! Brake hoses must not be exposed to oil or gasoline, and must not be varnished or coated with underbody protection. Check the freedom of movement of...
Replacing the check valve and vacuum booster hose Attention! Before starting work, press the brake pedal several times to relieve the vacuum in the brake booster, which will make it easier to disconnect the...
Bleeding the DSC brake system Attention! Remove air from the system only when the engine is idling. For auto «4,6is» with engine «M62» And «4,8is» with engine «N62» new brake fluid required...
ABS / ASC + T or DSC systems — general information Systems - ABS (Anti Bljckir System - anti-blocking system) and ASC+T (Automatische Spurtreue Charakteristikdynamische + Tagesleistung - automatic dynamic...
Replacing the hydraulic unit of the «DSC» system Attention! When the battery is disconnected and the loop is disconnected, the faults introduced during the operation of the vehicle are erased in the ECU-KSUD....
Booster pump replacement The design of the booster pump of the system «DSC» and its installation is shown in figure 11.70. The replacement of the booster pump must be carried out in...
Replacing the DSC sensor The sensor of the level of body revolutions around the vertical axis, simultaneously performs the role of a transverse acceleration sensor of the vehicle....
Wheel speed sensor replacement The front wheel speed sensor must be replaced in the following order. Remove front wheel. Unlock the loop, remove it from the holder and undock the loop....
Replacing the ECU of the ABS / ASC + T and DSC systems Attention! Observe safety precautions for protection against electrostatic discharge. Use grounding straps. Removing the ECU system «ABS/ASC+T» And «DSC» must...
Brake Pedal Replacement The brake pedal is mounted on a single pedal bracket (fig.11.79), the design of the pedal drive is shown in Figure 11.80. Replacement of a pedal of a brake is...
Diagnostics of malfunctions of the brake system Table 11.2. Diagnostics of malfunctions of the brake system Fault Cause of failure Troubleshooting Uneven action of the brake mechanisms of the wheels of one...