I have a 2000 Ford Ranger XLT. The proportional valve on the master cylinder is leaking and I am told that you cannot buy the valve separate from th emaster cylinder. Can anyone help with this problem?
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if the proportioning clogs or damaged it can cause brake problems such as yours take pressure readings on all 4 calipers the proportioning valve is just as it says differentiates the pressure front to back also the abs unit itself can cause the same problem also
Does sound like you need a new master cylinder. On a 2000 you wont need to back bleed. You will just need to follow the instruction and bleed the master and all four points. you will probably need to bleed the ABS block and proportioning valve but only if they have bleeders on them.
It sounds like you have a leak somewhere in your intake manifold. Have all hoses and seals checked. If the idle air control valve is malfunctioning it would cause the engine to idle high even after the engine is warmed up. Have it checked also.