History of the Development of Brakes :: Design and Technology

History of the information of haltThe first bracken system were thrum brakes. They were metal upon metal, andmade a terrible noise, although they did work. Since then, brakes affordbeen made with asbestos, which is heat resistant, troublesome wearing, andrelatively silent.Drum Brake (1890s1980s)The working parts of a drum brake atomic number 18 contained in a hardmetal drum that is attached to the hub of a seethe and revolves withit. Inside, but unattached to the drum, argon a pair of stationarycurved brake shoes that are normally held away from the drum bysprings. When the brake bicycle is depressed, fluid is forced by dint ofthe brake lines and into the wheel cylinder. Pushrods in the cylinderthen use instancy 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 jauntd from the brake pedal, springs on thebrake sh oes force the shoes prickle to their normal released position.This movement of the shoes forces the pistons inward, returning thefluid to the operate cylinder reservoir.Power Brakes (1940spresent)Power brake units intaked on passenger cars are of four generaltypes pointlessness suspended air suspended hydraulic booster, andelectro-hydraulic booster. Most source brakes use vacuum suspendedunits, which contains a oversized 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 t he 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 unendingly ready to apply the totalforce needed to go 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 works like a c-clamp to grip 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).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 a ir suspended 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 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 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).