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Brake Hydraulic System Principles & Service Tips.
Author/s: Bob Freudenberger
Issue: Sept-Oct, 1999
Everyone who works on brakes MUST know these concepts and procedures
In the early days of the automobile, some very clever engineering was employed to apply brakes mechanically. For example, the Italian Bugatti routed the cables over the top of the front axle so that the twisting action generated by stopping added force to the shoe cam lever.
No matter how ingenious the design, however, there was always a major drawback: Nothing could insure that braking force would be exactly equal at any pair of wheels, so there was a good chance that stepping on the pedal would cause swerving and skidding. This made the idea of hydraulically actuated brakes attractive--according to Pascal's Law, pressure at all points in a closed hydraulic system must necessarily be the same--but it took many years to develop dependable systems. The first car of any consequence to carry four-wheel hydraulic brakes was the. 1921 Dusenberg of the U.S.
On the most basic level, all brake hydraulic systems share the same principle: Muscle strength amplified by leverage and perhaps a power booster displaces fluid from the master cylinder and causes pressure to increase all through the circuits. This overcomes the retracting springs in drums and the seals' elasticity in disc calipers and pushes the friction material against the rotating member.
That much is obvious, but the subtleties of modern designs that provide proper performance in the real world deserve some explanation. Hence this article, which also includes important service information every mechanic should know about.
Although it has been in use for decades all over the world, the dual (also called "split" or "tandem") master cylinder is still widely misunderstood, so we had better explain its construction and operation. A typical late-model specimen will be of the composite variety (aluminum with a plastic reservoir), but iron one-piece units are still around in abundance. Two pistons ride in the bore, and here is where we encounter some confusing terminology. The rear piston is the primary, and the one in the front is the secondary. This apparent misnaming resulted because the rear piston is the first to receive the force of the driver's leg.
Each piston has a primary seal at its front and a secondary at its rear, so you will be hearing such combinations as primary piston secondary seal, secondary piston secondary seal, etc. The primary seals are the most important because they trap the fluid that is about to be squeezed into the lines. The primary piston's secondary seal keeps fluid from escaping out of the back of the cylinder (commonly into a booster), and the secondary piston's secondary seal acts as a barrier to make two essentially separate cylinders out of one.
In normal braking, the push rod from the pedal or booster forces the primary piston forward. No pressure is created until the primary seal covers the compensating or vent port from the reservoir. Once it does, fluid is trapped in the chamber between the pistons and becomes, for all intents and purposes, a solid column. Pressure is routed from this chamber to two wheels. The trapped fluid and the primary piston coil spring both bear on the secondary piston, moving it forward and creating pressure in the chamber ahead of the secondary piston's primary seal, to which the line to the other two wheels is attached.
Continued from page 1
When the pedal is released, a partial vacuum occurs in both pressure chambers because the fluid's inertia and viscosity prevent it from returning from the lines immediately. In order to re-arm the brakes instantaneously, the primary seals are designed to allow fluid to flow one way (forward) from behind each seal into the pressure chambers.
The replenishing ports allow fluid to move freely between the chambers behind both pistons' primary cups and the reservoir according to demand and expansion and contraction from temperature changes.
If a hose should rupture or one of the brake lines should become perforated from corrosion resulting in a catastrophic loss of fluid in half the system, the other half will still provide a means of decelerating the vehicle, albeit with a lower pedal and reduced stopping power.
Both pistons have extensions which project out ... more
Find essay on Second Law Of
Affirmative action works. There are thousands of examples of situations where
people of color, white women, and working class women and men of all races who
were previously excluded from jobs or educational opportunities, or were denied
opportunities once admitted, have gained access through affirmative action. When
these policies received executive branch and judicial support, vast numbers of
people of color, white women and men have gained access they would not otherwise
have had. These gains have led to very real changes. Affirmative action programs
have not eliminated racism, nor have they always been implemented without
problems. However, there would be no struggle to roll back the gains achieved if
affirmative action policies were ineffective. The implementation of affirmative
action was America's first honest attempt at solving a problem, it had
previously chosen to ignore. In a variety of areas, from the quality of health
care to the rate of employment, blacks still remain far behind whites. Their
representation in the more prestigious professions is still almost
insignificant. Comparable imbalances exist for other racial and ethnic
minorities as well as for women. Yet, to truly understand the importance of
affirmative action, one must look at America's past discrimination to see why,
at this point in history, we must become more "color conscious".
History Of Discrimination In America: Events Leading To Affirmative Action. The
Declaration of Independence asserts that "all men are created equal."
Yet America is scarred by a long history of legally imposed inequality. Snatched
from their native land, transported thousands of miles-in a nightmare of disease
and death-and sold into slavery, blacks in America were reduced to the legal
status of farm animals. A Supreme Court opinion, Dred Scott v. Sandford (1857),
made this official by classifying slaves as a species of "private
property." Even after slavery was abolished by the Thirteenth Amendment in
1865, American blacks, other minorities, and women continued to be deprived of
some of the most elementary right of citizenship. During the Reconstruction,
after the end of the Civil War, the Fourteenth Amendment was passed in 1868,
making blacks citizens and promised them the "equal protection of the
laws." In 1870 the Fifteenth Amendment was passed, which gave blacks the
right to vote. Congress also passed a number of civil rights laws barring
discrimination against blacks in hotels, theaters, and other places. However,
the South reacted by passing the "Black Codes, " which severely
limited the rights of the newly freed slaves, preventing them in most states
from testifying in courts against whites, limiting their opportunities to find
work, and generally assigning them to the status of second or third class
citizen. White vigilante groups like the Klu Klux Klan began to appear, by
murdering and terrorizing blacks who tried to exercise their new rights.
"Legal" ways were also found for circumventing the new laws; these
included "grandfather clauses", poll taxes, white only primary
elections, and constant social discrimination against and intimidation of
blacks, who were excluded form education and from any job except the most
menial. In 1883, the Supreme Court declared a key civil rights statute, one that
prohibits discrimination in public accommodations, unconstitutional. And in
1896, Plessy v. Ferguson (163 U.S. 537 ), the Court declared that the
state of Louisiana had the right to segregate their races in every public
facility. Thus began the heyday of "Jim Crow" legislation. In Justice
John Marshall Harlan's lone dissent, he realized it was a mockery. He wrote,
" We boast of the freedom enjoyed by our peoples above all other peoples.
But it is difficult to reconcile that boast with a state of the law which,
practically, puts a brand of servitude and degregation upon a large class of our
fellow citizens, our equals before the law. This thin disguise of 'equal'
accommodations for passengers in railroad coaches will not mislead anyone, or
atone for the wrong this day done." Not until sixty years later, in Brown
v. Board of Education of Topeka, Kansas (347 U.S. 483 ), was Plessy
overturned. Chief Justice earl Warren declared the unanimous opinion of the
court by saying: "We cannot turn the clock back to 1868, when the Amendment
was adopted, or even to 1896, when Plessy v. Ferguson was written." In
today's world, "separate educational facilities are inherently
unequal." This decision sparked racial tensions all across America. in
1957, President Eisenhower had to call federal troops into Little Rock,
Arkansas, after the state's governor forcibly barred black children from
entering white schools. In 1955, Rosa Parks was arrested and fined, for not
moving to the back of a public bus, ... more
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