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BEFORE YOU START
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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.
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.
Role of the vacuum servo connector and symptoms when defective
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.
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.
Check our brake booster change tutorial for more detailed symptoms:
Vacuum servo connector kit (check valve) replacement pictorial
Make sure you removed whatever needs to be removed for accessing the brake booster.
In the case of this vehicle (Peugeot 5008), the air inlet hoses, battery cover, battery and battery tray are to be dismantled.
Disconnect the vacuum hose and pull out the connector with your fingers while twisting it.
Remove the vacuum servo connector seal with your fingers or a flat screwdriver.
In the case of this vehicle (Peugeot 5008), the air inlet hoses, battery cover, battery and battery tray are to be dismantled.
Disconnect the vacuum hose and pull out the connector with your fingers while twisting it.
Remove the vacuum servo connector seal with your fingers or a flat screwdriver.
The new brake booster connector is supplied as a set consisting of the connector and its seal,
In some cases an additional holding support is also supplied.
In some cases an additional holding support is also supplied.
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Clean well the vacuum servo around the hole intended for the seal.
Put some lithium or silicone grease on the new seal.
Fix the brake booster to its holder if applicable.
Put some lithium or silicone grease on the new seal.
Fix the brake booster to its holder if applicable.
Push with force the check valve into the seal. Do not use any tool, do not use a hammer.
You should be able to do do with your hand only.
Reconnect the brake vacuum hose and test the vehicle.
You should be able to do do with your hand only.
Reconnect the brake vacuum hose and test the vehicle.
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