1991 Toyota Corolla Brakes intermittently engage without us

Tiny
WRIGHTWX
  • MEMBER
  • 1991 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
Sometimes my brakes engage themselves when I am driving. They will not fully engage, but partially, causing me to have to increase pressure on the accelerator so the car does not slow down. Sometimes they are already engaged when I first start the car up in the morning and sometimes they are fine, then randomly engage while I am driving. I can feel the tightness in the brake pedal when they are doing this. When not engaged, the pedal action feels softer. I have had the brake pads changed and the brake fluid flushed by a shop. In their words: "We don't know what is causing it." What is causing it and how do I fix it?
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Wednesday, May 14th, 2008 AT 2:50 PM

1 Reply

Tiny
MMPRINCE4000
  • EXPERT
The only thing I could think of is the booster is malfunctioning, somehow pushing the master cylinder rod (assuming the brakes are installed properly and the parking brakes and cable are functioning).

Also make sure you are not confusing the brakes with the transmission differential (which uses a seperate lubricant supply) and the differential is partially seizing. Check the differential fluid level.
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Thursday, May 15th, 2008 AT 7:39 AM

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