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This is not something that snuck up on me, it just one day started doing it.
What happens is that the brakes work normal until slowed and almost to a stop at which point the pedal feels rock hard as if there is no boost and I have to really stomp on it to get the car to fully stop. There is no indication of any sort of intake leak, no loss of brake fluid, no pulling left or right. I tried clamping off the booster line for comparison and it's obvious that the booster is working because it doesn't feel anything like it does when I disable it.
Panic stops are normal - of course in that situation I am already stomping hard on the pedal, I get no lock up front or rear as would be expected if the proportioning valve were malfunctioning.
It is the same even if I step on the clutch and let the engine idle prior to applying the brakes so it's not a matter of insufficient boost vacuum but it really feels as though boost has been lost, that's the best way I can describe it. Pumping the brake pedal has no effect.
Any ideas?
Edit: I should also add that it does this right from the get go, it's not a heat fade issue. Pedal travel is normal although when it goes hard there seems to be very little modulation or movement beyond that point.
What happens is that the brakes work normal until slowed and almost to a stop at which point the pedal feels rock hard as if there is no boost and I have to really stomp on it to get the car to fully stop. There is no indication of any sort of intake leak, no loss of brake fluid, no pulling left or right. I tried clamping off the booster line for comparison and it's obvious that the booster is working because it doesn't feel anything like it does when I disable it.
Panic stops are normal - of course in that situation I am already stomping hard on the pedal, I get no lock up front or rear as would be expected if the proportioning valve were malfunctioning.
It is the same even if I step on the clutch and let the engine idle prior to applying the brakes so it's not a matter of insufficient boost vacuum but it really feels as though boost has been lost, that's the best way I can describe it. Pumping the brake pedal has no effect.
Any ideas?
Edit: I should also add that it does this right from the get go, it's not a heat fade issue. Pedal travel is normal although when it goes hard there seems to be very little modulation or movement beyond that point.