Wheel and tire
The wheel assembly must be perfectly balanced. Make sure that there is no radial and axial runout on both the rim and the tire. Wheel bolts must only be tightened to the prescribed torque and in the correct sequence (evenly and crosswise).
Brake mechanisms
Check that the brake systems are in good general condition. Protective caps must not be damaged. The stroke of the pistons must be flawless, the guide elements must be in perfect condition (guide bushings, guide bolts, guide planes). Installed new pads must have good mobility in the guides of the caliper and fasteners.
Brake pads
Use only original ATE brand brake pads (or other approved). Choose them exactly according to the type of car and year of manufacture. Unnecessarily, do not allow sudden braking for the first 200 km after replacing the pads in order to provide them with a soft "running-lapping".
Brake discs
Brake discs should be changed simultaneously on the entire axle, taking new ones from the same package. Using a suitable solvent, completely remove the anti-corrosion protection from the disc. The surfaces of flanges and center holes must be clean and free of burrs and damage. Remember that for ventilated discs, the direction of rotation must be taken into account, and the balancing brackets must not be removed. Alignment should be carried out strictly observing the prescribed torque and the correct tightening sequence. When replacing brake discs, be sure to change the pads as well. If difficulties arise, flange the discs to the prescribed torque and check the end runout with a dial indicator at a distance of 10 mm from the outer edge of the friction surface. If the runout is too strong, then if possible move the disc in stages to other positions, again checking the runout.
Wheel hub
The area for the flange and the centering hole should be cleaned with an emery cloth until a metallic sheen appears. They should be free of rust and dirt. They must not be twisted or damaged. Do not apply lubricating paste (including copper). Check the flange area and centering hole for runout and flatness. Keep in mind that hub runout results in twice as much disc runout. When flanged on the brake disc, follow the recommended torque and the correct tightening sequence.
Wheel suspension
Independent suspension arms should not be deformed, and silent blocks should not be soft and broken. The rubber bushings of the shock absorbers should be intact, and the shock absorbers themselves (or racks) - in perfect working order. Check that the wheel alignment is exactly as specified by the manufacturer.
Wheel bearings
Check bearing wear. Install, secure and adjust according to the manufacturer's instructions.
Steering
Check the steering parts for wear. Tie rod heads must not be broken, and the rods themselves must not be deformed. Steering damper (if it is present on your car) must be in perfect working order.
Braking begins when the pedal is moved almost to the floor (increased pedal travel):
- Leak in the system;
- The presence of air in the system;
- Jamming of the mechanism of automatic adjustment of the rear brake;
- Damage to the coupled metering valve;
- Increased lateral play of the brake disc due to misfit or wear of the wheel bearings.
"Topkaya" pedal:
- Air in the system;
- Violation of the adjustment of the gap between the pads and the drum;
- Clogged vent hole in the tank lid;
- Deformation of brake pads;
- Use of a liquid with a low boiling point;
- Violations in the oil seals of the disc brake caliper.
Insufficient braking performance:
- Air in the system;
- Increased clearance between pads and drum;
- Oiling pads or getting water on them;
- Uneven fit of the pads to the drum;
- Leakage of brake fluid in the system;
- Contact with dirt, oil, grease and water on the lining surface.
- Wear of pads or pads in excess of the allowable limit;
- Wear of elements of the main brake cylinder or elements of the working brake cylinder;
- Jamming of the lever mechanism of the brake pedal;
- Boiling disc brake caliper pistons.
Unbalanced braking:
- Variation in tire pressure;
- Damage to pads or pads;
- Damage to the wheel cylinder;
- Violation of the adjustment of the landing of wheel bearings;
- Damage or wear to the surface of the drums;
- Wear of wheel cylinder elements;
- Weakening of the fastening elements of the working brake cylinders or the brake disc;
- Wheel misalignment.
Vibration brakes:
- Damage to pads or pads;
- Drum or disc damage;
- Lubrication of overlays.
"tacking" brakes:
- Violation of pedal adjustment;
- Damage to the lever mechanism of the brake drive;
- Malfunction of the master cylinder or wheel cylinder;
- pad damage;
- The parking brake does not release;
- Clogged pipelines or twin dosing valve;
- Damaged brake pad return springs.
Rear wheel lock:
- Insufficient braking efficiency of the front circuit;
- Increased wear or abnormal tire pressure;
- Incorrect action of the coupled metering valve (occurs when the brake pedal is pressed lightly);
- Local developments on the surface of the brake linings;
- Low pressure in rear tires.
Reduction of the liquid level in the absence of traces of leakage along the elements of the system:
- Leakage through the main cylinder into the vacuum booster of the system;
- Broken vacuum booster spring.
Brake Pedal Pulsation:
- Ellipsity or eccentricity of the brake drum;
- Increased lateral runout of the brake disc;
- Uneven thickness of the brake disc.
Spontaneous braking:
- Violation of the adjustment of the elements of the system;
- Violation of the tightness of the vacuum booster.