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How can a brake proportioning valve cause this?
Posted to Technical Theory Forum on 8/21/2012 8 Replies

Had this vehicle in my customer base for appr 7 years now. It had always had weird brake issues, notably the pedal dropping abruptly almost to the floor once every few months. It used to do this once every winter when it got colder than -25 or so.

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car Vehicle Data

2001 Kia Sephia LS 1.8L

Engine1.8 L
Trans4-speed Automatic (Electronic)

car Vehicle Data

2001 Kia Sephia LS 1.8L

Engine1.8 L
Trans4-speed Automatic (Electronic)