Air is removed from the brake system by bleeding the brake pedal, which requires an assistant.
If air needs to be bled from the entire system, air is bled from each wheel brake. This happens when air enters each individual brake cylinder. If only one caliper has been replaced or repaired, it is usually sufficient to bleed the corresponding brake cylinder.
Air removal sequence:
- 1. Brake Master Cylinder Air Release Valves (if any).
- 2. Rear right brake caliper or cylinder.
- 3. Rear left brake caliper or cylinder.
- 4. Front right brake caliper
- 5. Front left brake caliper.
Remove the cap from the brake cylinder bleeder valve. Clean the valve, connect a clean hose, lower the other end of the hose into a bottle half filled with brake fluid (suitable hose and appropriate container available from spare parts stores).
Have an assistant depress the brake pedal several times until the brake system is pressurized. This will be felt by the increased resistance when you press the pedal.
When pressure is reached, press the pedal without taking your foot off the pedal.
Open the brake caliper bleed valve about half a turn with a wrench. Brake fluid flows into the bottle. Make sure that the end of the hose in the bottle is always inside the liquid.
As soon as fluid pressure drops, close the air release valve.
Repeat the pumping process until pressure builds up. Keep your foot on the pedal. Open the air release valve until the pressure drops. Close valve.
Continue the process of removing air from the brake cylinder until no more air bubbles come out of the liquid flowing into the bottle.
After removing the air, remove the hose, put the cap on the valve.
In the same way, remove the air from the remaining wheels. Following the sequence of actions.
Caution: When bleeding air, occasionally look at the brake fluid reservoir. The liquid level should not drop too much, otherwise air will be sucked through the tank. Add new brake fluid!
After removing the air, the tank should be filled up to the MAX mark.
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