Hello,
I have an '86 F-150, rear wheel drive, manual trans, inline 6. Recently the brake booster was hissing, so I replaced it. Lately I have noticed the brakes feel very different.
- When travelling 25 MPH or higher, pressing the pedal to stop more suddenly, there is good pressure until about halfway down, then the pedal travels more easily and doesn't feel like it has much pressure (pumping it seems to build up some pressure). At the point the pedal does not have pressure, the brakes seem to brake harder (as if the pedal was really being pushed down hard).
- When travelling really slow, 5 MPH or so and I lightly apply the brakes to stop, the pedal travels just a little ways then the brakes just suddenly lock up (again as if the pedal was really being pushed down hard).
- From time to time the brakes (I think the front) do not seem to open up all the way, as there is a slight drag. This is more noticeable when stopping on a slight incline, the vehicle does not roll forward or backward when it should.
Does this sound like a faulty brake booster? Or does the booster need to be adjusted (in which direction)? I didn't notice this behavior with the old booster, and I have checked the fluid level and it is fine.
Thank you for all feedback, and help!!!
-- Chris