(Ganaway, 2002) Disc brakes utilised on these different kinds of systems vary in form and design significantly but not in principle. The basic principle remains fixed at using a disc mounted to a vehicle hub. During braking, the brake disc is jammed by using a calliper that is often triggered hydraulically on cars, jeeps, trucks, trains and a majority of motorcycles. (Popular Science, 1964) However, disk brake installations on bicycles are actuated by wire based systems. Previously drum brakes were widely utilised on all forms of vehicles especially in the earlier years of automobiles. However, the advent of disk brakes changed this forever. Disk brakes are far more convenient to install and maintain and produce greater braking loads in comparison to regular drum brakes. Consequently, certain vehicles have begun to utilise disk brakes on all wheels especially racing cars. Passenger vehicles however are often designed to use disk brakes on the front wheels while drum brakes are used on the rear wheels. This comes about as the load on the front wheels in often greater due to the weight of the engine. The particular disk brake being analysed here is a Ford Cortina disc brake which was installed on these vehicles between 1970 and 1982. Three versions of vehicles were installed with these particular disk brakes which were the Ford Cortina Mark III, IV and V ranging from 1970-76, 1976-79 and 1979-82 respectively. (Octane, 2011) There were only minor variations in these disc brake assemblies with only a few minor changes to the material of the discs. Otherwise a disk brake assembly from any of these three versions of vehicle can be fitted to a Ford Cortina belonging to this range. Product Specification The disk brakes on the Ford Cortina range began to appear in 1964. (Autocar, 1969) The current disk brakes being analysed come from a scrapped 1980 Ford Cortina. The Ford Cortina disk brakes being offered online (as replacement spares) are different from the original configuration whose specifications are outlined below. The disk brakes are non-ventilated in the Ford Cortina. There is only a simple straight disk that is mounted on the hub of the vehicle. If the disk brake had been ventilated, there would have been two parallel disks with involutes in between but this is not the case. The disc brakes are solid one piece and seem to be cast after which the circular faces have been machined to ensure smooth braking. The brake disc is raised from the centre like all other disc brakes so as to create installation clearance from the hub (also known as the spindle). The height of this raised feature is just over one inch. The disc is held in place by four metric bolts with a PCD (pitch circle diameter) of 3.64 inches. The outer diameter of the disc is around 9.61 inches while its nominal thickness is some 0.5 inches. The minimum thickness of the disc is around 0.45 inches. The other important component of the disc brake is the calliper which effectively stops the disc from spinning. The calliper is cast after which it has been machined. This is in contrast to most modern brake callipers that are forged. There are two brake pads that cover each side of the disc for braking. The brake pads are both numbered BPS1674 while the calliper bears a Lucas Girling manufacturing mark. The calliper is actuated hydraulically and the piston installed for this purpose has a
Product Innovation Disc type brakes are widely employed in vehicles around the world. These systems are commonly available and are simple to dismount, disassemble, service and reinstall. A few basic components make up the entire system. Certain dimensions are critical to ensure that the disc brake system performs flawlessly…
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11 pages (2750 words)Coursework
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