Check the brake system
Every year or every 20,000 km
Dust generated by wear pads and adhering to brake components may contain hazardous asbestos. Do not Blow the dust by means of compressed air and do not inhale it! Do not use petroleum-based solvents to remove dust. The dust should be washed off special brake cleaner or methylated spirit to drain capacitance. After wiping the brake system components with a damp cloth rag and the contents of the discharge capacity should be kept in a closed container and signed. In the future, if possible, try to not use asbestos-containing components.
In addition to inspections at specified intervals condition of brake mechanisms should be made each time the wheels are removed, or when signs of faults in the system. To ensure the safety of driving the following procedures test the brake system are the most important of all the procedures made by you on car servicing.
Signs of problems in the braking system
Disc brakes may have a built-in wear indicators friction linings, which signal that the lining wear has reached a critical value. This pad should be changed immediately, otherwise brake discs are damaged and will need expensive repairs.
Any of the following signs may indicate a potential defect in the braking system:
- When squeezing the brake pedal car "leads" in one direction
- Brakes braking issue scraping or squealing noises
- The brake pedal stroke is excessive
- The brake pedal pulsates (this is normally only when the system is ABS)
- Observed leaking brake fluid (usually on the inner side of the tire or wheel)
In the event that at least one of these symptoms immediately inspect the brake system.
Brake lines and hoses
The braking system is mainly used steel brake tubes, except flexible reinforced hoses have the front wheels and as the compounds of the rear axle. Regular inspection of these lines is very important.
- Park the vehicle on level ground and turn off the engine. Remove the caps from the wheels. Loosen but do not remove the bolts on all four wheels.
- Poddomkratte car and reliably establish it on support.
- Remove the wheel (see. Section Poddomkrachivanie and towing or instruction manual for your car).
- Check all brake lines and hoses for cracks and abrasions in their outer coating, leak, blistering and deformation. Check the brake lines at the front and rear of the vehicle for signs of softening, cracks, deformation or wear caused by friction of the other components. Check all couplings for signs of leaks, and make sure of reliability of fastening of all bolts and brake hose clamps.
- Upon detection of fluid leaks or damage should be immediately corrected. For a more detailed description of the procedures for repair brake system, refer to Chapter Brake System.
- If you have not already done Poddomkratte car and reliably establish it on support.
- Now you can see the support of the disk brake, which is located inside pads. Each caliper has outdoor and indoor shoes - should check both.
- Estimate the thickness of pad, looking at the inspection hole in the caliper housing. If the thickness of the friction lining is 2.0 mm or less, or if they are worn on one side more than the other, the pads should be replaced (see chap. Brake System). Remember that the friction linings are usually pasted on the metal substrate pads - the thickness must not be taken into account when measuring. Always replace the pads on both sides of the vehicle (included on the same axis), even if worn only one of them, otherwise the process will be uneven braking.
- Take a look at the special inspection opening in the caliper to check the brake pads - brake linings, which rub against the disc, you can also check by looking through the ends of the caliper.
- Remove the caliper without disconnecting the brake hoses (see chap. Brake System).
- Check the condition of the brake disc. Inspect it for the presence of fissures, deep scratches, hot spots (they look like blue or discolored spots). When signs of wear or damage the drive can be removed and machined in a mechanical workshop; If this is not possible, it should be replaced. In this and in another case to be replaced or eat through both discs, even if worn only one of them. A more detailed inspection and repair procedure is described in Chapter Brake System.
- Using the instructions of the Head Brake system, remove the rear brake drums.
- Measure the thickness of the friction lining on the brake shoes back and check them for signs of contamination with brake fluid or grease. If the pad has a thickness of between 2.0 mm above the heads of rivets or metal base, replace shoes. Are eligible for replacement also cracked, zapolirovat to shine and contaminated brake fluid or grease clogs. Replacement procedure is described in Chapter Brake System.
If laths glued to the substrate of the shoe, the measurement of thickness is performed from the substrate surface as shown in (A); if the linings are riveted to the metal of the shoe, measured from the lining to the tops of the heads of rivets.
- Check the condition and retention of clamping spring shoes, as well as the adjustment mechanism. Make sure that all the components are properly installed and in working condition. Worn or deformed spring can cause premature wear of the friction linings.
- Check wheel cylinders for signs of leaks, gently pushing the protective rubber covers. The presence of small traces of moisture under the covers is allowed. If it is found underneath it or brake fluid flows from the wheel cylinder, the cylinders should be overhauled or replaced (see chap. Brake System).
- Check the drum for any deep scratches, cracks and fissures hot spots that look like discolored patches. If the detected defects can not be eliminated with the help of sandpaper, the drum should be machined in the workshop (see chap. Brake System for more information).
- Following the instructions of the Head of the braking system, install the brake drums.
- Install the wheel, but do not lower the car.
The simplest, and perhaps the most obvious way to test the operation of the parking brake is to set the car on a steep slope with a cocked brake and transmission in the neutral position (when testing, you should be in the car). If the parking brake w keeps the car from rolling, it should be made the adjustment as described in the Head Brake system.