With the wheel removed, you can see the following elements of the disc brake system
1 - dustproof cuff of the upper mount of the caliper; 2 - brake hose; 3 - bleed valve with dust cap; 4 - caliper with brake cylinder piston housing; 5 - inner and outer brake pads with springs; 6 - dustproof cuff of the lower mount of the caliper; 7 - caliper mount; 8 - brake disc; 9 - locking screw of the brake disc; 10 - wheel hub.
Together with the front wheel, depending on the modification of the Renault 19, a solid or ventilated steel brake disc rotates freely in the air stream. Brake calipers in the form of a saddle surround the brake discs. When you press the brake pedal with your foot, the pistons press the brake pads against the brake disc - while the disc is clamped by two brake pads - and thus the car slows down. The frictional heat generated during braking is removed by the air flow during driving. The air stream also removes particles worn off the brake pad lining. Brake pads on discs do not require adjustment.
Note. Recommendation: When it rains, the brake disc gets wet, which slows down the brakes by a fraction of a second. This is because the water film between the brake disc and the pads must first evaporate.
In winter, when the roads are covered with salt, the brakes do not work immediately, and sometimes the brake system does not work at all. The layer of salt must first be wiped off the brake pads and brake discs. When crossing a puddle containing salt while driving, the brakes need a few seconds to fully decelerate. Wet from rain or from melt water, the brakes must be dried by briefly pressing the brake pedal several times. In addition, you can drive several hundred meters with light pressure on the brake pedal.
Renault 19 is equipped with a floating caliper disc brake system, i.e. the brake caliper is movably fixed to the guide bolt.
- When braking, the piston presses the inner brake pad against the brake disc. This pressure causes the caliper to move, and thus there is an even distribution of pressure on the outer and inner brake pads.
- When the brake pedal is released, the piston seal pulls the piston and caliper away from the brake disc so that a small gap is created allowing the brake disc to rotate freely.