Method of evaluating surface and material flaws of disc brake pads after testing

2015 ◽  
Keyword(s):  
Disc Brake ◽  
Brake Pads

No Breaks for Noise

1999 ◽  
Vol 121 (08) ◽  
pp. 62-63 ◽  
Author(s):  
Paul Sharke
Keyword(s):  
Brake System ◽  
Disc Brake ◽  
Brake Pedal ◽  
Passenger Compartment ◽  
Engine Noise ◽  
Master Cylinder ◽  
Noise And Vibration ◽  
Brake Pads ◽  
Mechanical Components ◽  
To Come

This article highlights the fact that engineers who design and test anti-lock brake systems (ABS) have been trying to come up with ways to minimize the noise and vibration that drivers hear and feel when they stomp on the brake pedals. The ABS engineers want drivers to do during a panic stop is to let their feet off the brakes. According to the engineers, braking should be the concern, because the less time the driver worries about stopping the car, the more time there is to concentrate on steering it. The mechanical components in both systems are functionally identical, consisting of a brake pedal, a master cylinder and booster, hydraulic lines and fluid, wheel calipers, brake pads, and rotors. In fact, unless the system is actuated by hard braking, ABS acts just like an ordinary disc brake system. Engine noise would only mask the ABS noise reaching the binaural head, which sits inside the passenger compartment where a driver would normally be.

Study on Influence of Air Pressure on Braking Condition

2005 ◽  
Author(s):  
D. Chen ◽  
P. Huang
Keyword(s):  
Friction Coefficient ◽  
Applied Load ◽  
Polymer Matrix Composite ◽  
Air Pressure ◽  
Experimental Results ◽  
Disc Brake ◽  
Temperature Peak ◽  
Brake Pads ◽  
Friction Heat ◽  
Disc Brakes

In the present paper, air pressure and temperature on the interface of the polymer matrix composite (PMC) brake pads are measured by disc brake under braking condition, and their influences are studied as well. The experimental results show that the air temperature peak is not as high as that on the surface. The air pressure of the interface varies with the applied load. The air pressure is negative under the small applied load, but positive under the large applied load. The analysis of the experimental results shows that the phenomena are caused by the friction heat and the rotate disc. Since the air pressure is very small comparing with applied load, it influences on the friction coefficient slightly. But, the negative air pressure of the interface increases the chance of the drag friction in the non-braking mode for disc brakes.

Flexural Effects in Disc Brake Pads

1978 ◽  
Vol 192 (1) ◽  
pp. 1-7 ◽  
Author(s):  
P. R. J. Harding ◽  
B. J. Wintle
Keyword(s):  
Load Distribution ◽  
Critical Length ◽  
Theoretical Treatment ◽  
Disc Brake ◽  
Computer Study ◽  
Simple Experiment ◽  
Structural Behaviour ◽  
Length Effect ◽  
Brake Pads ◽  
Element Technique

Details of the automobile disc brake are outlined, leading to the flexural requirements and construction of friction pad assemblies. A theoretical treatment of these is given, introducing the concept of a critical length which influences pressure distribution and reliability. A simple experiment which illustrates the critical length effect is described, with details of the experimental and theoretical correlation. The finite element technique is applied in a computer study of the structural behaviour of pad assemblies when subjected to various loads. Effects of load distribution, pad compression and backplate rigidity are discussed in the context of specific operational problems.

Comparative study of different solid lubricants towards friction stability in a non-asbestos disc brake pad

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Baskara Sethupathi P. ◽  
Chandradass J.
Keyword(s):  
Wear Resistance ◽  
Testing Machine ◽  
Synergetic Effect ◽  
Solid Lubricants ◽  
Metal Sulfides ◽  
Disc Brake ◽  
Mechanical And Thermal Properties ◽  
Brake Pad ◽  
Content Type ◽  
Brake Pads

Purpose This study aims to compare the influence of different solid lubricants on the friction stability of a non-asbestos disc brake pad. Design/methodology/approach Three brake pads were developed using three lubricants, namely, non-asbestos brake pad with sulfide mix (NASM), non-asbestos brake pad with bismuth sulfide (NABS) and non-asbestos brake pad with molybdenum disulfide (NAMO). Sulfide mix was indigenously developed by physically mixing friction modifiers, alkaline earth chemicals and various metallic sulfides homogeneously dispersed in graphite medium. The physical, chemical, mechanical and thermal properties of brake pads were characterized as per industrial standards. The tribological performances were studied using the Chase testing machine as SAE-J661-2012. The worn surface of the pads was studied using scanning electron microscope to analyze the dominating wear mechanism. Findings NASM was excellent in fade as well as wear resistance. NABS was better from a wear point of view, but fade resistance was moderate despite its higher cost. NAMO fared average in fade and wear despite its excellent dry lubricating properties. NASM was excellent in terms of fade as well as wear resistance. Originality/value Among the selected metal sulfides, the indigenously developed sulfide mix was better than the other two sulfides, which indicates that the synergetic effect of metal sulfides was always preferable to the individual sulfides.

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