If all the rotors need replaced, DBC is a great option. The best scenario is to prevent brake rotor warping, but if you already have this problem, it is important to take care of it as soon as possible by replacing the rotors and brake pads. Consider different types of rotors to give you the best cooling brake system available for your vehicle to ensure that brakes cool properly and to guarantee there is no more warping.
After replacement, you will need to break in the rotors and pads according to the manual or the guidelines provided. To keep the rotors in the best working order, be sure to lubricate the rotors, pads, and wheel hubs properly as needed, and refrain from driving into puddles when your rotors are overheated due to excessive braking.
This entry was posted in Uncategorized on January 31, by cdr. Toll Free How to Prevent Brake Rotor Warping. Install a High-Quality Brake Rotor If your brake rotors are already warped, you need to replace them with new ones.
Install Brake Pads If your brake rotors have been warped for a long period, you might need to consider installing new brake pads. Break in the Pads and Rotors Once you have installed new brake rotors and pads, you must break them in properly. Breaking in Brake Pads Start driving and continue until you reach 40 miles per hour. Engage a hard brake once you reach 40 mph, but do not come to a complete stop. A hard brake is where you "slam" on the brakes.
Start accelerating again to 50 miles per hour and slam on the brakes again just until the ABS has been engaged approximately 10 miles per hour. Again, do not come to a complete stop. Repeat the above two steps for a total of four times. So far, you should not have completely stopped yet. Accelerate to 65 miles per hour, and then take your foot off the gas and coast to 15 miles per hour. Once at 15 miles per hour, brake slowly until you come to a complete stop.
Park the vehicle and let the car cool off for 20 minutes. Preventing Brake Rotor Warping in the Future After the break-in procedure, it is important to prevent warping from happening again, or you might be continuously purchasing new rotors and pads before their time. Types of Brake Rotors There are actually quite a few rotor types, and each of these is meant to do something different. How to Find Brake Rotors on DBC If you have warped rotors, whether on a car or motorcycle, you will need to replace the brake pads and rotors before doing anything else.
Conclusion The best scenario is to prevent brake rotor warping, but if you already have this problem, it is important to take care of it as soon as possible by replacing the rotors and brake pads. Leave a comment Please wait These rotors are completely smooth when they come out of the factory. They can become warped over time, which basically means that they lose their even and smooth surface.
This is bound to cause wear and tear which results in the warping of the rotors. There are a few reasons why brake rotors end up warping. Wear and tear is the simplest reason. Use them for a long time and all of that heat and friction is going to end up taking its toll on the metal. The pads grind into the rotor every single time the speed needs to be reduced.
This same step is repeated countless times over the lifespan of the rotor. In this scenario, the stresses on the rotors are much higher than they would be if the vehicle was only being used on normal roads.
If worn out brake pads are used for prolonged periods they end up damaging the rotor. Brake rotors actually come in many different types and each has their own set of advantages.
Drilled and slotted rotors are among the most commonly used options. Drilled rotors are a good choice for those who live in areas that receive a lot of rainfall. Since the water escapes that the rotor is more dry, this provides an improved brake bite. This can cause them to fail sooner. They remain a great option for street cars. As the name suggests, slotted rotors have grooves that are cut along the face of the rotor, the part that comes in contact with the brake pad. The slots on the rotor allow these gases to escape.
This improves the brake bite and maintains stopping power. Slotted rotors are widely used on heavy trucks, off road vehicles, SUVs, and performance vehicles. There are a few precautions that you can take to prevent brake rotors from warping. Once new brake rotors and pads have been installed, you should probably break them in. This is done to ensure that the pads properly clean the rotor and apply the right amount of friction.
Not breaking in these parts initially could prevent the pad from properly cleaning the rotor in the future. The braking system tends to generate a lot of heat and if heated metal is cooled down too quickly, it can cause the metal to warp.
So while driving over puddles of water might seem cool, the temperature difference between the water and the braking system will be significant. It will cool off the pads and rotor too quickly and this can end up distorting the metal. Merely changing your driving style can go a long way in maintaining the health of your brake rotors for longer than you might imagine.
Be a little light with the foot on the brake pedal and your braking system is going to reward you for it. Another simple method to prevent rotors from warping is to ensure that the lug nuts are evenly tightened once they have been removed.
They should be tightened in either the star or the cross pattern so as to prevent uneven clamping between the rotor, hub and wheel. Brake rotors are made of metal and cryogenic treatment is a proven way of increasing abrasion resistance and help reduce warping under rapid temperature change s for metal components.
A lot of stress can actually build up inside the metal once during the casting proces s. In some cases though, the particular type of pad in use on the vehicle will wear away the high spots on the rotors, but the end result is the same; thickness variations on the rotor that cause brake pedal pulsations. In cases like this, even high-quality brake rotors such as those supplied by DBA will be affected, since the pad material is bonded to the rotor on the molecular level.
This pad material imprint will create a higher level of resistance than the rest of the rotor causing an oscillating brake torque, steering wheel vibration and pedal pulsation. Of course, no technician can be blamed for the way some customers use the brakes on their vehicles, but in many cases, the uneven transfer of friction material from brake pads to brake rotors is the direct result of how we install brake rotors, which brings us to-. We all know that the mating surfaces on both the hub and new rotor must be free of dust, dirt, rust, metal shavings and other debris and we usually do a proper job of cleaning both surfaces, but how often do we actually test the run out on the new rotor after it was fitted to the hub?
Can we honestly say that the newly replaced rotor is always running true, or at least, within specified run out values?
While it is true that high quality aftermarket brake rotors such as those supplied by DBA are almost certainly within OEM specs with regard to allowed run out limits, we often forget some very important things when we replace brake rotors, such as that-. On most vehicles, the effective clearance between the brake pad and the brake rotor is only about than one tenth of a millimetre when there is no pressure on the brake pedal, and sometimes less when a caliper piston seal is sticky.
Such small clearances do not allow for much, if any brake rotor run out. Wheel hub mounting faces are often not flat, or perfectly true with respect to the axle centre line. Long use, continued exposure to heat, vibration, shock loads, and the long-term effects of less than perfect wheel bearings can deform the mounting face of a wheel hub to the point where a rotor that is mounted on the hub will either deform when it is bolted down, or show excessive run out even though the rotor itself may be in perfect condition.
Brake rotors are mass-produced in huge numbers, which means that even though most randomly chosen rotors from a particular production run will conform to specs, small differences in the temperature of the manufacturing environment, wear on cutting tools used in machining process, and other factors produce dimensional differences between individual rotors. For this reason, it is important only to use rotors from high-end manufacturers such as DBA, who go to great lengths to ensure that dimensional and other differences are kept within OEM specs.
As described elsewhere, the predominant cause of brake pedal pulsations is the uneven transfer of friction material between brake pads and brake rotors that occurs when brake pads come into intermittent contact with brake rotors even when there is zero pressure on the brake system when significant amounts of run out is present on the rotors.
Moreover, even if the run out is less than the clearance between the pads and the rotor, this clearance can be absorbed when the rotor heats up and begins to expand.
However, there is much that we as technicians can do to prevent this from occurring, but note that what follows should not be seen as additional labour; instead, it should be treated as standard practice in all brake rotor replacement jobs that will cure recurring brake pedal pulsation issues once and for all-.
0コメント