my brakes

[zed]

hi there,

i have a blobeye wrx sti - i have this strange problem with my car. when ever i drive fast my brake pedal goes hard but as soon as I'm back to normal speed it becomes normal.

can anyone guide me in the right direction and tell me what i will need to do?

thanks
zed

[Donkey]

Sounds like maybe the brake booster is going bad or the oone way valve in the vacuum house is malfunctioning.I would try buying a new hose from the dealership and replacing the old one and see what happens.The one way valve is actually a plastic cylinder inside the hose.

[zed]

thanks for the reply m8, how much will these part cost me? do you have a part no.?

thanks