Diyvehiclerepair
If your brake pedal feels like it's pulsing or vibrating, you might have brake disc thickness variation (DTV). This is a small variation in the thickness of the friction surface of the rotor(s). This is usually caused by the rotors receiving uneven wear.
- What causes disc thickness variation?
- Which term refers to variations in thickness of the rotor?
- How is thickness variation measured?
- What is thickness variation?
- Can caliper cause grinding?
- What is the thickness of a rotor?
- What are caliper housings made of?
- Is parallelism and thickness variation are the same?
- What is the minimum brake disc thickness?
- What causes hard spots on rotors?
- What is the thickness of a new brake pad?
- Which of the following can cause brake system dragging?
- What is lining heat fade?
What causes disc thickness variation?
Disc thickness variation happens when a rotor varies in thickness on its surface. What causes a Disc Thickness Variation to occur? DTV is caused by an excessive lateral runout. Lateral runout is the amount of side to side movement of the rotor as it rotates.
Which term refers to variations in thickness of the rotor?
rotor parallelism are variations in thickness.
How is thickness variation measured?
Run out needs to be measured with a dial indicator with the rotor mounted on the vehicle however, DTV can be measured using a precision micrometer off the vehicle. This is done by measuring the thickness of the rotor 25mm in front of the outer edge.
What is thickness variation?
Brake disc thickness variation means variation in the thickest and the thinnest parts of the rotor. This causes the rotors to have an uneven wear. This is a rotor condition that one of the rotor surface is thicker than other.
Can caliper cause grinding?
Sticking caliper or wheel cylinder: A sticking caliper can cause the pads to be continuously forced against the rotor, creating a grinding or squealing noise. ... You'll also want the pads and rotors, or shoes and drums, inspected for damage and replaced as needed.
What is the thickness of a rotor?
Measure the brake rotor thickness 0.40 inches (10mm) inside the outer circumference of the brake rotor every 45° ( 1 / 8 of a rotation). 6. Compare the smallest value measured to the minimum thickness specifications stamped on the brake rotor. If the rotor is below the minimum thickness, the rotor must be replaced.
What are caliper housings made of?
Modern braking systems in cars typically are made of cast iron or a combination of a cast iron bracket with an aluminum brake caliper housing.
Is parallelism and thickness variation are the same?
Brake pedal pulsation with the brakes applied, may be the result of rotor thickness variation typically described as parallelism. Parallelism is when the rotor thickness varies from one point to another.
What is the minimum brake disc thickness?
Providing continuous cracks are not apparent, minimum brake disc thickness is 37 mm. Brake discs should be replaced in pairs. Brake pads should also be replaced when new brake discs are fitted. If this instruction is not adhered to, there is a danger that braking performance could be seriously reduced.
What causes hard spots on rotors?
This only happens with excessive heat, which can happen if you are constantly apply pressure to your brakes. This heat causes the metal to become soft, which can cause the metal to wear down in certain spots making the surface uneven.
What is the thickness of a new brake pad?
The friction material on a new brake pad is typically about 8-12 millimeters thick, and those that are ready for replacement are worn down to about 3 mm.
Which of the following can cause brake system dragging?
Brake dragging is commonly caused by broken or weak springs on the drum brakes. It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. Additionally, brake dragging can also be caused by frozen emergency brake cables as well as overextended self-adjusters.
What is lining heat fade?
Brake fade is caused by a buildup of heat in the braking surfaces and the subsequent changes and reactions in the brake system components and can be experienced with both drum brakes and disc brakes. ... Loss of stopping power, or fade, can be caused by friction fade, mechanical fade, or fluid fade.
