History of the Development of Brakes :: Design and Technology

History of the Development of brakesThe first brakes were drum brakes. They were metal upon metal, andmade a terrible noise, although they did work. Since then, brakes overhearbeen made with asbestos, which is heat resistant, sound wearing, andrelatively silent.Drum bracken (1890s1980s)The working parts of a drum brake be contained in a hardmetal drum that is abandoned to the hub of a revolve and revolves withit. Inside, barely unattached to the drum, ar a pair of stationarycurved brake billet that are normally held away from the drum bysprings. When the brake bicycle is depressed, fluid is forced throughthe brake lines and into the wheel cylinder. Pushrods in the cylinderthen afford crush to both shoes, overcoming the spring tension andpressing the shoes against the drum. Hydraulic drum brakes can also bemechanically activated as parking brakes by a cable attached to thelever. When pressure is re drop deadd from the brake pedal, springs on thebrake shoes force the shoes sanction to their normal released position.This movement of the shoes forces the pistons inward, returning thefluid to the bounce back cylinder reservoir.Power brakes (1940spresent)Power brake units used on passenger cars are of four generaltypes vacuum hang air suspended hydraulic booster, andelectro-hydraulic booster. Most power brakes use vacuum suspendedunits, which contains a mountainous vacuum-powered booster device to providethe added thrust to the typical power-brake. press on the brakepedal pushes forward a rod connected to the pistons of the two controlcylinders. The pistons begin forcing fluid into the front and rearbrake lines. At the same time, the brake-pedal pushrod positions thevacuum-control valve so that it closes the vacuum port and seals offthe forward half of the booster unit. The engine vacuum line thendraws off the air, creating a low-pressure vacuum chamber. Atmosphericpressure in the control chamber then pushes against the diaphragm,dividing the two c hambers. The pressure on the diaphragm, which islocked to the pushrod, forces it forward, supplying even more pressureon the pistons. The safe driver is always ready to apply the totalforce needed to return their vehicle, even if the engine quits (removingthe power assist).Disc Brake Disc (1970spresent)Brakes use a clamping action to produce friction between thewheel and the suspension members which hold the wheel. Firmly mountedto the spindle, the caliper kit and boodle like a c-clamp to pinch the rotorwhich is attached to the spinning wheel. Floating calipers allowthemselves to move slightly when the brakes are applied, because onlyone lose ones temper moves (in relation to the caliper).History of the Development of Brakes Design and TechnologyHistory of the Development of BrakesThe first brakes were drum brakes. They were metal upon metal, andmade a terrible noise, although they did work. Since then, brakes havebeen made with asbestos, which is heat resistant, hard wearing, andrelatively silent.Drum Brake (1890s1980s)The working parts of a drum brake are contained in a hardmetal drum that is attached to the hub of a wheel and revolves withit. Inside, but unattached to the drum, are a pair of stationarycurved brake shoes that are normally held away from the drum bysprings. When the brake pedal is depressed, fluid is forced throughthe brake lines and into the wheel cylinder. Pushrods in the cylinderthen apply pressure to both shoes, overcoming the spring tension andpressing the shoes against the drum. Hydraulic drum brakes can also bemechanically activated as parking brakes by a cable attached to thelever. When pressure is removed from the brake pedal, springs on thebrake shoes force the shoes back to their normal released position.This movement of the shoes forces the pistons inward, returning thefluid to the master cylinder reservoir.Power Brakes (1940spresent)Power brake units used on passenger cars are of four generaltypes vacuum suspended air suspe nded hydraulic booster, andelectro-hydraulic booster. Most power brakes use vacuum suspendedunits, which contains a large vacuum-powered booster device to providethe added thrust to the typical power-brake. Pressure on the brakepedal pushes forward a rod connected to the pistons of the two mastercylinders. The pistons begin forcing fluid into the front and rearbrake lines. At the same time, the brake-pedal pushrod positions thevacuum-control valve so that it closes the vacuum port and seals offthe forward half of the booster unit. The engine vacuum line thendraws off the air, creating a low-pressure vacuum chamber. Atmosphericpressure in the control chamber then pushes against the diaphragm,dividing the two chambers. The pressure on the diaphragm, which islocked to the pushrod, forces it forward, supplying even more pressureon the pistons. The safe driver is always ready to apply the totalforce needed to stop their vehicle, even if the engine quits (removingthe power assist).Disc Br ake Disc (1970spresent)Brakes use a clamping action to produce friction between thewheel and the suspension members which hold the wheel. Firmly mountedto the spindle, the caliper works like a c-clamp to pinch the rotorwhich is attached to the spinning wheel. Floating calipers allowthemselves to move slightly when the brakes are applied, because onlyone pad moves (in relation to the caliper).