Note: Service brake fluid is toxic; the liquid that has got on the skin must be washed off immediately; if the liquid gets into the eyes or mouth, seek medical attention immediately. Some types of working fluid sometimes ignite even from contact with the hot surface of parts. In addition, brake fluid destroys painted surfaces and acts aggressively on some types of plastics. If even a small amount of liquid breaks through. wash it off as soon as possible with plenty of clean water. The liquid is hygroscopic (draws moisture from the air) - the old fluid may be contaminated and unsuitable for further use.
A common part
If there has been a brake fluid leak or if air has entered the system, the system must first be purged before proceeding further.
Park the vehicle on a level surface, start the engine, and engage first gear or reverse on manual transmission models (on models with an automatic, put the selector lever in the position "R"). then place bars under the wheels and release the handbrake.
Bleeding air from the brake system
If the damage is in only one hydraulic circuit (it has a diagonal flare on non-ABS models and front and rear flare on models with ABS), then venting will only be required in the corresponding circuit. In case of brake master cylinder (disconnecting or connecting), if the brake fluid level has dropped significantly, it is necessary to remove air from the entire system, observing the following sequence.
For models without ABS:
- A) right front brake;
- b) right rear brake:
- V) left front brake;
- G) left rear brake.
For models with ABS system:
- A) right front brake;
- b) left front brake;
- V) right rear brake;
- G) left rear brake.
Bleeding the system (basic way of working: together)
Prepare a clean glass vessel (jug), a plastic or rubber tube that matches the size of the outlet nipple, and a nipple wrench.
Remove the dust cap from the first nipple in the order of operation. Put the tube and wrench on the nipple, place the other end of the tube in a glass jug and pour brake fluid into it so that it covers the end of the tube.
Check that the level in the hydraulic fluid reservoir is kept slightly above the MIN level mark throughout the entire process.
It is necessary that the assistant depress the brake pedal several times to the stop to create pressure, then leave it in this position.
unscrew the nipple (about one turn) and let the liquid drain into the jug. At the same time, the assistant should press the pedal all the way down to maintain pressure, and release it when necessary. When all the fluid has drained, tighten the outlet nipple and have an assistant release the pedal slowly, then check the fluid level in the reservoir again.
Repeat these operations until there are no air bubbles in the fluid coming out of the nipple.
Bleeding the system - using a device with a valve
Such kits consist of a piece of pipeline having a one-way valve to retain air to direct fluid back into the system; some devices have a transparent can so that bubbles coming out of the tube can be seen.
The device is connected to the nipple, which is then opened. Then you need to press the brake pedal smoothly and evenly, slowly releasing it. The operation must be repeated until all air is completely expelled from the system.
You need to keep track of that. ensure that the level is above the MIN·mark, otherwise air will be drawn into the system.
Bleeding the system with a pressurized air bleeder
Such devices are usually powered by compressed air, such as a spare chamber, although you will have to reduce the pressure in accordance with the instructions that came with the device.
Connect a pressurized container of fluid to the brake fluid reservoir and, by opening each nipple, bleed air from the system (sequentially, in order), until all air bubbles are removed.
For all methods
After air release and exclusion "failure" brake pedal, wash off any spilled fluid, tighten the nipples securely and install the protective caps. Do not overtighten the nipples.
Check the brake fluid level in the reservoir and top up if necessary.
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