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Right up to date this review on braking
Page 43
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RARELY HAVE I READ such a comprehensive review as that given in Braking of Road Vehicles by T. P. Newcomb and R. T. Spurr of Ferodo Ltd., published by Chapman and Hall Ltd. at 50s. It is completely up to date with regard to commercial vehicle applications and it reviews braking phenomena and problems relating to all types of vehicle, articulated outfits included, in the light of recent investigations and developments.
The book goes into detail on, for example, load-apportioning and anti-lock systems and actuators of the spring and lock type.
Factors influencing the behaviour of decelerating vehicles are described and one chapter deals with the forces acting on the brake in the case of disc brakes as well as drum brakes. Thermal aspects of braking are outlined in detail and means of calculating the temperatures attained during single and repeated applications are given.
The design on foundation-brake compo nents is reviewed and actuating systems are fully covered. Handbrake assemblies are analyzed and leading types of auxiliary brake are mentioned including the exhaust brake and the compression-release system and retarders of the hydraulic and eddy-current type. A comparison is made between their performance characteristics.
The chapter on brake testing discusses test results in detail. The effect on brakeperformance of the road surface, the condition of the tyres and of the form of suspension fitted is considered and controversial aspects of braking are discussed.
In a paragraph on the divergency of European and American views on whether frontor rear-wheel skidding is the more serious, the authors observe that while all skids are dangerous, "the controversy probably reduces to whether the driver prefers to leave the road head first or tail first".
Evidence is repeatedly revealed that the authors are realistically aware of the operators' and drivers' approach to vehicle handling, notably with regard to stability. The ergonomics of braking are also reviewed and it is emphasized that little is known about the psychology of braking.
References are given at the end of each chapter covering sources of information in the form of text books and technical articles published over the past 10 or more years. A number of references is made to recent articles in COMMERCIAL MOTOR.
• DEVALUATION will inevitably increase the cost of oil supplies. The impact on prices is under urgent consideration and will be discussed with the Ministry of Power, announces Shell-Mex and BP Ltd.
• LEYLAND announces that its Albion and Scammell service and spare parts depot is now located at its new heavy commercial vehicle centre at Aldenham, Hefts (CM, October 20). This follows the closing of the Leyland Motors Ltd. Willesden depot.