Replace all important parts like shafts,bushings,bearings,sleeves,o-rings,gaskets and seals. After assembling check for vacuum seal. Leak test to 1*10-9 mbar l/s. Analyze the vibration and record the data digitally.
Depending on the year, the brake wheel hub is or part of the brake booster assembly. Using a leak detector, find the leak and determine if replacement is needed.
If you have a vacuum leak then you probably have a bad hose somewhere in the assembly. Check the lines that the power braking fluid runs through and replace it.
The booster will need to be replaced. First the brake pump will need to be unbolted from the booster. then the booster disconnected from the firewall and the peddle disconnected. Reverse instructions for reassembly.
In order to repair a power brake booster that has a vacuum leak you will need to be able to get under your vehicle. Once under the vehicle you will needs tools such as a wrench.
