When the brakes are not being applied, the piston is returned to its original position by the force of the brake shoe return springs.

# When the drums are heated by hard braking, the diameter of the drum increases slightly due to thermal expansion, this means the brakes shoes have to move farther and the brake pedal has to be depressed further.

When the brake pedal of a modern vehicle with hydraulic brakes is pushed, ultimately a piston pushes the brake pad against the brake disc which slows the wheel down.

When conventional brakes are used, 100 % of the kinetic energy lost is converted to thermal energy, and dissipated in the form of heat.

When introduced these were almost exclusive to dive bombers, though the air brakes fitted to modern aircraft function in a similar manner.

When the train brakes are applied during normal operations, the engineer makes a " service application " or a " service rate reduction ”, which means that the train line pressure reduces at a controlled rate.

When brake pipe continuity exists throughout the train, failure of the brakes to apply or release on one or more cars is an indication that the cars ' triple valves are malfunctioning.

When the boot comes out of the ski, the brakes spring out perpendicular to the ski and stop the ski from sliding.

When distributed-power locomotives are directed to set the brakes simultaneously, the desired air pressure change will reach more cars sooner.

This may cause behavioural problems for the afflicted bird When a bird needs to reduce its speed during flight, it employs a ' reverse thrust ' action by extending its wing at the wrist joint and using the drag of its primaries as air brakes.

When ESC detects loss of steering control, it automatically applies the brakes to help " steer " the vehicle where the driver intends to go.

When the car is braked harder, the conventional brakes are activated.

When Sid discovered the car parts Gary and Abby had been buying were actually stolen, his brakes were tampered with in order to keep him from testifying to this in court.

When the use of automatic brakes was made compulsory in the Regulation of Railways Act 1889, the equipment was modified so that it operated the brakes ; however, the term " communication cord " has survived.

When the extension to Fenchurch Street was brought into use the pair of cars for that station was slipped from the rope at Minories as before, but the brakes were not applied.

When the spoilers deploy on the ground, they decrease lift and make the brakes more effective.

When the chassis control system determines a wheel is slipping the computer applies the brakes to that wheel.

When series production started by the end of the year, many details had been altered: brakes, ventilation system, grille and parking lights.

When ESC detects loss of steering control, the system applies individual brakes to help " steer " the vehicle where the driver wants to go.

When used as a method of decreasing the landing distance of an aircraft below that available solely from the aircraft's brakes, the device is called a drag parachute or braking parachute.

When the signal to launch is given, the train rolls back slightly ( to engage the catch car ) and the brakes on the launch track retract.

When the brakes are subsequently released, the wheel will continue to roll around with the flat spot, causing a banging noise with each rotation.

When the train is braking, brakes on the head end of the train will apply first causing the locomotive to slow down and the slack to run in.

When I show up he will know you are a good wife to have told him about it ''.

When the Know-nothings get control, it will read, All men are created equal except Negroes and foreigners and Catholics.

When the reactionary response is thus bolstered by an intellectual defense, the characteristics of that defense are explicable only in terms of the basic attitudes of unanalyzed reaction.

When combined with the metaphysical notion that pure forms of this universe are best appreciated when least embodied in a material substratum, it becomes clear that while earth will be dross on a scale of material-formal ratios, celestial bodies will be of a subtle, quickened, ethereal existence, in whose embodiment pure form will be the dominant component and matter will be absent or remain subsidiary.

She used to tell me, `` When I stand there and look at the flag blowing this way and that way, I have the wonderful, safe feeling that Americans are protected no matter which way the wind blows ''.

When we consider the disorganized state of the world community, and the legacy of predispositions adversely directed against all who are identified as Jews, it is obvious that the struggle for the minds and muscles of men needs to be prosecuted with increasing vigor and skill.

When these fields are surveyed together, important patterns of relationship emerge indicating a vast community of reciprocal influence, a continuity of thought and expression including many traditions, primarily literary, religious, and philosophical, but frequently including contact with the fine arts and even, to some extent, with science.

When different colors are used, she is just as likely to color trees purple, hair green, etc..

When finally the two bedraggled men reach their friend's home, Voltaire's fears are once again aroused.

`` When are you to leave ''??

When the roof blocks are all in place, the final rows of wall blocks are mortared into position.

When the aid operations are reorganized the Peace Corps should remain a semi-autonomous, functional unit.

When the budget goes to trustees for approval it is the president's budget, to which his faith and credit are committed ; ;

When they have 4 to 6 leaves and are thrifty little plants, it's time to set them out where they are to remain.

When aircraft are no longer helpless on airfields, they are no longer vulnerable to Aj.

When more than two figures are separated by subtraction symbols the subtraction must be carried out from the left to right if the result is to be correct.

When they're on, the top edges are planed even with the sheer batten.

When painting, Mason's physical eyes are half-closed, while his mind's eye is wide open, and this circumstance accounts in part for the impression he wishes to convey.

When improvements are recommended in working conditions -- such as lighting, rest rooms, eating facilities, air-conditioning -- do you try to set a measure of their effectiveness on productivity??

When sufficiently accurate and complete measurements are available, it will be possible to set limits on the thermal and electrical characteristics of the surface and subsurface materials of the moon.

When some thirteen records of newly and recently born individuals are collated, little or no correlation between length and distribution can be detected.

When three dice are tossed repeatedly, what is the probability that the number of aces is 0 ( or 1, or 2, or 3 )??