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What is the role of the friction coefficient in brake pads?
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By carbdoc
I can't find a rebuilt brake booster for my 1978 Dodge D-150 truck anywhere; I have been hunting for months. The Chrysler number is 4094149. The A-1 Cardone number is 54-73716. I would settle for a rebuildable core at this point; my old booster is rusted-out on the back side so it is no good as a core.
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By 袁春凤 (Tiffany)
The phenomenon that two objects move relative to each other to produce motion resistance between their contact surfaces is called friction, which is called friction. The existence of friction not only increases the power consumption, but also causes the wear of parts' contact surfaces. Therefore, lubricating oil is usually used between the relative moving surfaces of automobile parts to reduce friction. Failure of automotive parts 75% is caused by friction.
Friction can be divided into dry friction, liquid friction, boundary friction and mixed friction according to the lubrication state of the parts.
(1) dry friction
The friction between the frictional surfaces without any lubricating medium is called dry friction.
When the parts are in the state of dry friction, the surface of the parts is abraded sharply, so the surface of the moving parts of the automobile should avoid the occurrence of dry friction as far as possible.
Dry friction and boundary friction are the main friction between the upper part of cylinder wall and piston ring. Dry friction will occur when the journal and bearing are subjected to impact load in the working process.
(2) liquid friction
Two the friction of the friction surface when the lubricant is completely separated is called liquid friction.
In liquid friction, the two friction surfaces are completely separated by a layer of lubricating oil film with a thickness of 1.5-2.0um, which avoids direct contact between the working surfaces of the two parts. Friction only occurs between the lubricating fluid molecules, so the friction resistance is very small, and the wear of the parts is very slight.
Most of the relative motion parts of a car are carried out under the condition of liquid friction (for example, crankshaft and bearing).
(3) boundary friction
Two friction surface separated by a very thin boundary film is called boundary friction.
The oil film thickness is usually below 0.1um. Friction only occurs between the outer molecules of the boundary film, reducing the friction and wear of the parts. But its thickness is very small, and it is easy to be destroyed by impact and high temperature, so it is not as reliable as liquid friction.
For example: between cylinder wall and piston ring; if the work crankshaft and journal between the insufficient supply of lubricant, easy to produce boundary friction.
(4) Mixed friction
The friction between two friction surfaces in the presence of dry friction, liquid friction and boundary friction is called mixed friction.
In the actual working state, the parts usually work under the mixed friction state, and the friction state varies with the working conditions.
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By Counterman
Global automotive brake systems supplier
link hidden, please login to view announced the launch of its latest product line — HELLA PAGID Semi-Metallic Silver brake pads. The pads utilize a metal content greater than 50% and are formulated using a precise combination of metallic fibers, organic materials (including rubber, resin, and friction modifiers), and approved fillers, according to HELLA PAGID. “This unique formulation ensures these brake pads deliver exceptional performance while maintaining the highest standards of safety and reliability,” the
link hidden, please login to view added. According to HELLA PAGID, other features include:
Unmatched Performance and Active Braking Safety: HELLA PAGID Semi-Metallic Silver brake pads deliver exceptional stopping power and enhanced braking performance, the company said. Designed with advanced friction materials, these brake pads ensure reliable and consistent braking in various driving conditions, offering drivers confidence and safety on the road.
Versatility for a diverse range of applications, including:
Vehicles that experience repetitive braking conditions: Delivery Drivers, Ride-share, Daily Commuters Towing and Hauling High-Performance Vehicles Recreational and Off-road applications Fleet and Emergency Vehicle Superior Heat Dissipation: One of the standout features of the HELLA PAGID Semi-Metallic Silver brake pads is their superior heat dissipation capability, according to the company. The advanced design effectively reduces the risk of brake fade during severe or repeated braking, maintaining optimal performance even under the most demanding conditions. This feature is crucial for drivers who require consistent and reliable braking power, whether on the road or off the beaten path.
Enhanced Durability: Durability is a key factor in the design of the HELLA PAGID Semi-Metallic Silver brake pads. The inclusion of high-quality, metallic fibers significantly increases pad longevity, making them the perfect option for high-performance vehicles, off-road adventures, and towing applications. This increased durability translates to fewer replacements and lower maintenance costs, providing long-term value to customers, HELLA PAGID said.
“We are thrilled to introduce the HELLA PAGID Semi-Metallic Silver brake pads to our product lineup,” said Brian Couch, product manager at HELLA PAGID. “Our team has worked tirelessly to develop a product that not only meets but exceeds the expectations of our customers. With enhanced performance, superior heat dissipation, and unmatched durability, these brake pads are poised to set a new benchmark in the industry.”
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