The front brake rotors can warp and cause a vibration when braking. The rotors will need to be machined or in cases where they are worn to thin, replaced to correct this issue.
Problems for specific Honda Civic Si years:
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Newest reported 1991 Honda Civic Si problems
Plugged moon roof drains can cause a water leak inside the car, usually over the head of the driver or passengers head when turning a corner. Cleaning the drains will fix this problem.
Leaking tail light gaskets can allow water into the tail light assembly and inside the vehicle. Replacing the tail light gaskets will commonly correct this issue.
An oil leak at the spark plug area (spark plug tubes) can be caused by a failing valve cover sealing rubber and/or camshaft holder o-ring. The sealing rubber and o-ring will need to be replaced to address this issue.
Certain models can leak oil externally or allow coolant into the combustion chamber due to a faulty head gasket. The head gasket needs to be replaced to correct this problem.