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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.
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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
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Irony Moll Flanders
I love but hate, I laugh without a smile, I am ridiculous and respected, hypocrite and honest, a nonsense with reason , a convict and a gentleman. Isn't that the world we live in ? He is using a subtle form of humour by saying things that he does not mean. This situation is odd or amusing because it involves a contrast. Irony kills, laughs, denounces, argues but is hidden behind words to look not so politically incorrect. Daniel Defoe was one of those who wanted to denounce society's incongruities. He used his character, Moll Flanders, as an archetype of 18th century England society depicting the cruelty and the immorality of the time. In this autobiography (the novel is written in the first person) Moll's life seems to be fill of contrasts and ironic situations, but is that not interpretation? This essay will discuss the irony in the novel Moll Flanders taking examples from the book to prove whether or not it should be considered as a ironic novel. Let's have a look at the interpretations that one may have.
As a preliminary, it must be noted that Moll has a basically bipartie structure, the first part containing Moll's sexual adventures, the second her life as a thief, her imprisonment, and her transportation to America. The difference here, however, is that Defoe has effected an organic rather than a merely schematic relationship between the two halves. The episode of the two brothers, an episode which is crucial to our understanding of the novel's irony. Moll is seduced by the elder brother of the family in which she is a maid, then is persuaded by him to marry Robin, the younger brother, who loves her and proposed to her. She is a bewildered, passive object in the centre of the family dispute: her position is no sooner established as the elder's brother mistress, than he suggests that she should accept Robin's offer of marriage, thus becoming his sister where formerly she was his whore later affirming: " I shall always be your sincere friend, without any inclination to nearer intimacy, when you become my sister" . He presses her hard, and the traumatic effect the affair has on Moll is symbolized in her near-fatal illness. Not surprisingly, after her marriage she succumbs to incestuous fantasies:" I was never in bed with my husband but I wished myself in the arms of his brother; ... I committed adultery and incest with him every day in my desires, which, without doubt, was as effectually criminal in the nature of the guilt as if I had actually done it" . Robin dies after five years, and there is an interval consisting of two main episodes, in one of which Moll marries a gentleman-tradesman who, faced with financial ruin, leaves her "a widow bewitched; I had an husband and no husband" ; and in the second of which Moll helps a young lady avenge herself on a captain who regarded her as too easy a conquest.
The notion of revenge on the male, and the fact that it is Moll who is taking the initiative, and not members of the opposite sex, are indicative of a radical change of character. It is indeed ironic, then, that by making the initiative Moll should soon land herself in a situation which strongly resembles her earlier one with the two brothers: she now courts and marries her own brother.
She discovers the truth only when she is on her husband's plantation in Virginia and his mother narrates her life story. As she listen to it, Moll gradually gathers " that this was certainly no more or less than my own mother, and I had now had two children, and was big with another by my own brother", following this with declaration which echoes the one quoted above from page 68 "I lived therefore in open avowed incest and whoredom, and all under the appearance of an honest wife; and though I was not much touched with the crime of it, yet the action had something in it shocking to nature, and made my husband, as he thought himself, even nauseous to me." At first she conceals the ... more
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