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All pictures and texts in this web page are the property of nomaallim.com. Any use of any part of those contents without the written consent of nomaallim.com shall be subject to legal procedures as per international and local laws in the concerned country. Using the name "nomaallim" or "nomaallim com" or "nomaallim.com" in the text describing the unauthorized copied content shall not constitute an exception and shall be sanctioned in accordance to the effective laws and proceedings.
BEFORE YOU START
DISCLAIMER:
Our pictorials are of informative nature and do illustrate works carried out by ourselves at our own premises for our own use and satisfaction. Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability. NOTE: this tutorial is valid for the following Mitsubishi, Peugeot and Citroën models:
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When and why to replace the brake booster one-way valve?
Symptoms of a defective connector or its hose.
The vacuum servo connector connects the servo to the vacuum source on the engine, but is not simply a connector.
It is actually a check-valve, also called non-return valve, that allows the fluid (air in this case) to flow in one direction but not the other.
Vacuum from the engine inlet or a specific vacuum pump, pulls the servo diaphragm each time you push on the brake pedal, which adds force to the pressure you do with your foot, thus "amplifies" your own force and generates more breaking with less energy.
In practice, you just feel a powerful breaking when pressing on the pedal, while in case of a vacuum leak, or if the check-valve is defective, your brake pedal will become stiff and hard to press, and you will have to deploy a tremendous force to slow down your vehicle!
Another symptom is to find the pedal stiff and very hard to press each time you access your vehicle, then to have it working as normal once the engine starts.
You may also hear a whistling sound that increases or decreases with engine RPM, in case of a leak at the connector's hose or bushing level.
Check our brake booster change tutorial for more detailed symptoms:
It is actually a check-valve, also called non-return valve, that allows the fluid (air in this case) to flow in one direction but not the other.
Vacuum from the engine inlet or a specific vacuum pump, pulls the servo diaphragm each time you push on the brake pedal, which adds force to the pressure you do with your foot, thus "amplifies" your own force and generates more breaking with less energy.
In practice, you just feel a powerful breaking when pressing on the pedal, while in case of a vacuum leak, or if the check-valve is defective, your brake pedal will become stiff and hard to press, and you will have to deploy a tremendous force to slow down your vehicle!
Another symptom is to find the pedal stiff and very hard to press each time you access your vehicle, then to have it working as normal once the engine starts.
You may also hear a whistling sound that increases or decreases with engine RPM, in case of a leak at the connector's hose or bushing level.
Check our brake booster change tutorial for more detailed symptoms:
How to replace the brake vacuum valve on the Mitsubishi Lancer 2.0 EX
With your fingers, simply grab the elbow shaped vacuum connector of the brake booster on the Mitsubishi Lancer and pull it out:
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Using pliers, remove the vacuum hose clamp and pull out the vacuum valve from its hose.
Check the hose for cracks (which is much probable) and cut a few millimeters out of it.
Use a flat screwdriver to take off the rubber bushing that holds and seals the connector to the booster.
Check the hose for cracks (which is much probable) and cut a few millimeters out of it.
Use a flat screwdriver to take off the rubber bushing that holds and seals the connector to the booster.
Refitting a new vacuum valve on the Mitsubishi Lancer EX 2.0 brake booster
With a soft damp cloth, clean well the brake booster prior to refitting the new bushing, then fit the connector to the hose and press it firmly in the bushing. Insert back the vacuum hose in any of its holding clips or clamps on the vehicle.
That's it!
That's it!
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