It is known that the application of the oil adhesion to the brake rotor and pad surface is strictly prohibited, but to prevent unpleasant squeaking brake noise, it is necessary to apply grease with an appropriate material on the right spot.
By regularly checking and greasing up when replacing the pads, the resonance between the pads and the rotor can be suppressed to maintain a comfortable brake feeling with noise and discomfort.
1. The "unfamiliarity" of the pads and rotor contributes to the sound
2. Pad grease that absorbs pad vibration
1. The "unfamiliarity" of the pads and rotor contributes to the sound
Have you ever been surprised to hear strange squeals when you gently grasp the brake lever, even after replacing from worn brake pads to new one? I think one of the possible causes of the brake sound is the "bad contact of the brake rotor and pad". The surface of the brake rotor which has been scraped by the pad is worn to a greater or lesser extent and has irregularities and stripe scratches, and the surface of the pad that has been used so far is also worn according to the shape of the rotor surface.
However, if only the pads are newly replaced to new pads with a flat surface, the entire pad surface does not fit with the rotor surface evenly. As a result, the vibration generated during braking is transmitted to the rotor causing an unpleasant sound.
The dirt such as the pad dust that get stuck to the outer periphery of the caliper piston has protruded due to the wear of the brake pad. When replacing to new brake pads, push the caliper piston back after cleaning the area around the piston. If using a special tool for caliper piston, it is possible to push back straight without causing a prying or damaging the piston.
▼ Special tool in pushing back the caliper piston when replacing brake pads ▼
Click here for Disc Brake Piston Tool Product Page
・Uncomfortable Brake Squeal caused by bad contact between the pad and the disc.
・Basically, new pads do not come into a uniform contact with the worn discs causing an abnormal squeal occurrence.
2. Pad grease that absorbs pad vibration
An effective way to reduce brake squeal is to apply special grease to the back of the brake pad. When the surface of the pad reaches the rotor, the vibration occurs. However, the application of grease to the back of the pad causes an interference film between the caliper piston absorbing the vibration.
If grease sticks to the pad surface, of course the braking force will deteriorate and it will be very dangerous. The DAYTONA brake grease being used here is a spray-type and dries quickly, so it can be applied evenly and assembled right away.
▲ Spray type brake grease that can be applied evenly compared to paste type products. Spray it to the back plate of the pad facing down to avoid unnecessary application on the surface.
When using a paste-type brake grease, apply it mainly to the contact area with the caliper piston. When applying grease, apply it not only to the back side of the pad but also to the contact area between the thin metal bent part called the retainer and the pad, squeal caused by vibration can be suppressed.
While doing so, be careful of the adhesion to the rotor and pad surface, and if it sticks, thoroughly degrease and clean with a powerful parts cleaner. In addition, the caliper that fixes the pad with a penetration type pin, apply a thin layer of grease to the surface of the pad pins.
The pad pin that determines the position of the brake pad and insufficient lubrication will cause the pad to move poorly and contribute to brake squeal. Level the surface of the pin with a non-woven fabric and apply a thin layer of pad grease.
・Easy-to-use special grease to reduce squeal.
・Apply grease to the back of the pad to absorb vibration and to reduce the squeal.
・It is effective to apply not only to the pads but also to the retainers and the pad pins.
3. Grease up the slide pin
If the caliper is a pin slide type, it is also important to grease the slide pin so that the caliper moves smoothly according to the operation of the brake lever. A bellows rubber boot is set at the base of the slide pin, but rusting may occur if it breaks due to deterioration over time and water entry.
Then, the caliper movement will deteriorate and the rotor and pad will always be in contact with each other, causing brake squeal.
If the pin slide of caliper sticks, the caliper body cannot move and the pad rotor always comes into contact with each other causing to be worn out and produces an abnormal squeal. After removing the pad, check the state of the slide pin. In the case of an opposed piston caliper, there is no slide pin on the mechanism. The slide pin can be pulled out when replacing the pad, so check the condition of the rubber boots, clean it and grease the pins.
These operations can reduce squeal after the pad replacement. POINT ・In the case of pin slide type calipers, it is also important to grease the slide pins. ・If the slide pin rusts due to long use, the caliper movement will deteriorate and cause squeal. ・In the case of opposed piston caliper, there is no slide pin. When replacing a new pad, use the pad grease properly to control the squeal of the brake.
The application of the pad grease is effective to prevent the squeal sound when installing a new pad. When replacing the pads, the effect of pad grease is reduced by cleaning and repainting, and the effect of preventing squeal sound is restored.
