There are literally hundreds of reasons why brake noise occurs and most have nothing to do with brake pads. Proper installation, brake system maintenance, rotor quality and debris tend to be the most common causes. Sometimes brake squeal can be an indicator that there is a problem. Maintenance is required if you experience brake squeal for any of the following reasons:
In some cases, a user may experience brake noise when no maintenance is required. Hawk calls these NVH (Noise, Vibration and Harshness ) issues. Brake squeal is typically caused by vibration between the brake pads, rotors, and brake calipers. Some brands of semi-metallic brakes are more likely to experience brake squeal due to the metallic ingredients in the brake pads. Hawk Performance has a great reputation for manufacturing low-noise, high-performance brake pads. All Hawk Performance products have an OE quality shim, severe duty powder coat surface treatment and “GearHead Grease Paks” to virtually eliminate the risk of brake noise. Below are the instructions for proper use of Hawk “GearHead Grease Paks.”
1. To silence brake noise – Apply 1-2 grams on the backside of the brake pad and evenly spread across the surface making sure to cover any areas where the pad contacts the caliper or piston.
2. To lubricate calipers – Clean and inspect all brake caliper parts making sure to inspect for damage or excessive corrosion. Apply to pins, slides, bushings, pistons, rubber sleeves and seals. DO NOT APPLY TO THE ROTOR FACE OR THE BRAKING SURFACE OF THE PAD!
Caution: For eye and skin contact, flush with water for 15 minutes. Wash skin with soap and water; call a physician if irritation persists. If swallowed do NOT induce vomiting; call a physician. KEEP OUT OF REACH OF CHILDREN.
Brake Pad Burnishing/Bedding-In Instructions
Correct brake pad break-in (bedding) is important to assure quality braking performance over the life of the pad. This procedure allows the rubbing surface of the brake pad to be brought to temperatures, creating a transfer-film layer of friction material to be applied to the rotor surface. This allows the brake pad material to rub against itself rather than the bare rotor. This increases the stopping performance of the brake pad and can reduce pad and rotor wear.
Yes you can. Hawk does suggest a slotted or solid faced rotor for performance applications. Cross drilled rotors are primarily for looks and as such some trade offs will occur, such as increased brake pad wear and increased dust.
First, choose Hawk Performance high performance disc brake pads as your upgrade over other aftermarket brake suppliers. The next best steps you can take to avoid having noisy brakes are:
Racing brake pads are made from a variety of ingredients like metals, resins and fillers. The combination of ingredients and the size and weight of the ingredients used in the friction formula can create very different performance levels and characteristics.
Choosing the proper brake pad compound that will provide the best performance for your Motorsports application can be made easier by following the guidelines outlined below:
When a friction compound is used in a substantially higher temperature range than intended, the material can quickly lose its ability to perform correctly. Generally, an overheated brake pad will continue to provide a hard pedal but require more foot and pedal effort to achieve even marginal performance. Continued use during this type of circumstance can result in complete brake pad failure.
It’s important to understand the chain of events that take place when a brake pad becomes too hot to work correctly. As the pad begins to lose performance effectiveness the driver may try to compensate by pushing harder and longer on the pedal. This may cause friction surface temperature to increase thereby increasing the brake problem. When this occurs, great stress is put on the friction material and the material can begin to crystallize. In extreme cases delaminating between the friction material and the pad's backing plate can sometimes occur. This type of situation may be corrected by choosing a friction compound designed to withstand higher temperature.
Correct brake pad break-in (bedding) is important to assure optimal braking performance over the life of the pad. This procedure allows the rubbing surface of the brake pad to slowly be brought up to racing temperatures. Proper bedding creates a transfer layer film of friction material to be applied to the rotor surface. This allows the brake pad material to rub against itself rather than the bare rotor. This increases the stopping performance of the brake pad and can reduce pad and rotor wear.
Brake Pad Burnishing/Bedding-In Instructions:
IMPORTANT REMINDERS WHEN BURNISHING/BEDDING BRAKE PADS
Proper break-in will assure that small amounts of heat are introduced to the brake pad. Brake pads that are brought up to temperature too fast and not properly allowed to cool down may quickly become glazed and not perform as originally intended. The pad’s rubbing surface reaches extreme heat levels during racing use. The surface needs slow temperature increases to help prepare the pad. Large amounts of heat all at one time can cause the brake pad rubbing surface to become somewhat liquified and coat the pad surface with a glaze. This will dramatically reduce stopping performance as certain ingredients in the friction compound breakdown and cause glazing of the rubbing surface of the brake pad.
When a brake pad glazes over, the friction surface develops a cloudy or glassy looking coating. It is possible to remove the glazed surface by using sand paper to grind away the damaged layer and expose a new layer that will require the proper bedding procedure.
Some brake pad manufacturers offer a pre-bedded pad and/or a pre-bedding service. Pre-bedding involves placing pads in a caliper and running them against a mechanically driven rotor in a controlled environment. The rotor and pads are slowly brought up to temperature and allowed to cool down over several cycles. This process simulates on track situations while allowing the two surfaces to mate correctly in an optimum environment. While this process can be very expensive, it greatly reduces the break-in time prior to pad purchase. In most cases the rotor and the pad are, and should be, sold as a matched set.
Some brake pads are pre-burnished during the manufacturing process. Pads that are pre-burnished have had high temperature applied to the rubbing surface to simulate the first few engagements on an actual racecar. The process will allow the pad to break-in quickly and to begin working more effectively in a shorter time. Pre-burnished pads still need to be properly bedded to help assure that the pad and the rotor have an opportunity to mate correctly.