How to Replace Your Brake Booster

A brake booster operates with the use a vacuum in aiding the brake pedal release its pressure though all this many sounds fancy its makeup is quite simple it's a chamber which houses the rubber diaphragm that changes when there are variations in the vacuum pressure. For this device to operate efficiently there must be a reliable vacuum source, the booster must also have a single way valve as this will stop the vacuum recompression, It must also have a diaphragm that is free from holes with the correct rod settings.

Checking for a leaky vacuum.

2. If you notice that the vehicle pedal pressure is abnormal the first thing to check is the source of the vacuum. You will want to check the hoses for damage, such as holes. Check the strength of the hose you will notice that hoses with holds are generally soft and they collapse quite easily. It could also mean there is a problem with the inlet variations such as a bad connection. If find that any of these problems are evident fix them and continue is there is no restoration of braking function

3. If you do not find any evident problems in your preliminary diagnostics start your engine. Using a pair of plier's, compress the hose at midpoint between the booster and the engine, now carefully extract the single directional valve from out the booster. Please take caution in ensuring that the rubber gourmet remains intact as this is where the singe directional valve connects. If you release the pliers your engine is not going to work properly. First thing to do is place one of your fingers over the single way end. You can now disengage the pliers and check to see if the vacuum is operating properly or if there are any leaks present all this will be audible. You will notice a fizzing sound to confirm leaks are present.

Check the Booster and Master.

4. If good suction is present in the hose and you do not find any other leaks using the pliers to hold the hose again to reduce vacuum loss now place back the single directional valve inside of the vacuum amplifier. Turn off the engine and pull the single directional valve from the booster. You will notice a large whooshing noise once the booster works properly meaning its holding the vacuum.

If you do not hear anything you will need to check to see if the single directional valve is working properly. You can do this by sucking one side first and after words the other. Once you are able to suck air in a single direction consider the valve operational, however if you can suck air for both sides it's dysfunctional and you will have to replace it.

After completing all of the procedures above, you will either have a good valve or a bad booster. The above test will determine whether you need a new one. Factors that will determine the failure of the device are the condition of the master cylinder. If the master cylinder is the mounting surface for brake fluids and this can cause the diaphragm to disintegrate. If brake fluid is present, you will need to change the master cylinder. Failure to do this runs the risk of damaging your new booster.

After completing all of the procedures above you will either have a good valve or a bad. Once there are no problems found then you are good to go.