documentos_Cap._3_56815bcb

# documentos_Cap._3_56815bcb - MANUAL INGLES REMSA:Maquetacin...

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C HAPTER 3 15 THE BRAKING SYSTEM The brake system of a modern vehicle is made up of the following elements: Diagram of a diagonal split brake system 1. BRAKE BOOSTER: The brake booster is a system which reduces the pressure that must be placed on the pedal in order to pressurise the circuit at the same pressure. In other words, it is an element which reduces the effort required from the driver to pressurise the circuit by pressing the pedal. MANUAL INGLES REMSA:Maquetación 1 29/4/10 12:23 Página 14

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Technical Brake Pad Guide 16 17 A brake booster is fitted between the brake pedal and the master cylinder which increases the force applied to the pedal with the help of a vacuum. Negative pressure is applied from the intake manifold to the master cylinder and atmospheric pressure is applied to the side of the brake pedal when it is pressed. In addition to the force applied to the brake pedal by the driver, the brake booster also applies the force produced by the vacuum in order to make the braking more efficient. The advantage of the brake booster is not only that greater pressure can be applied to the hydraulic circuit and consequently to the caliper pistons, with less effort required by the foot, but improved brake proportioning is also achieved. The most common brake boosters are currently those which act by means of a vacuum. These devices exploit the depression created in the intake manifold when the foot is taken off the accelerator to increase the force that the foot applies to the brake pedal. Comparison of the force of the pedal to be applied in a vehicle without brake booster and another equipped with brake booster The typical pedal/booster effort values for the type of system shown above are as follows: Force on the pedal (Kg) Pressure in the circuit with booster (bars) Pressure in the circuit without booster (bars) 0 0 0 10 30 13 20 65 24 30 104 34 40 118 44 50 130 53 60 140 63 70 150 75 80 160 86 90 170 100 100 180 113 C HAPTER 3: T HE BRAKING SYSTEM MANUAL INGLES REMSA:Maquetación 1 29/4/10 12:23 Página 16
C HAPTER 3: T HE BRAKING SYSTEM 18 19 2. MASTER CYLINDER The master cylinder or main cylinder is responsible for pressurising the liquid throughout the hydraulic circuit. As current legislation requires vehicle manufacturers to ensure that these are equipped with dual circuit brakes, tandem brake pumps are used. The tandem system means that the pump has two pistons, placed alongside each other, which are responsible for the supply of the fluid at the same pressure for each of the two independent circuits, normally distributed in an “X” shape. In other words, one circuit acts on the left front wheel and right rear wheel whilst the other acts on the right front wheel and left rear wheel, providing an element of safety in the event of problems of loss of efficiency in one of the two circuits. 3. BRAKE REGULATOR

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documentos_Cap._3_56815bcb - MANUAL INGLES REMSA:Maquetacin...

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