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Master Cylinder Symptoms, Please


Old 02-17-2004, 06:06 PM
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Join Date: Nov 2003
Location: Commonwealth of Virginia
Posts: 4
Master Cylinder Symptoms, Please

Please post any symptoms of a failing master cylinder. I am concerned that I don't have adequate braking power and I believe I may have a master cylinder problem. Based on your input, I'll decide whether to purchase and replace this part. Thanks!
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Old 02-17-2004, 06:32 PM
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Join Date: May 2000
Posts: 4,761
Pedal depth feels variable and mushy.
Later, pedal goes to floor.
Later, stranded.
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Old 02-17-2004, 06:44 PM
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Join Date: Sep 2000
Location: Mpls, MN
Posts: 1,704
The F-150 hydraulic brake system consists, more or less, of:
  • Master cylinder
  • RABS (Rear ABS)
  • Brake proportioning valve (so the rear doesn't lock up immediately)
  • Brake lines
  • Brake hoses
  • Brake calipers
  • Wheel cylinders

A leak anywhere in the hydraulic system will give symptoms similar to a bad master cylinder. You'll find more info on google than we could compile here. What problems are you having?
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Old 02-17-2004, 08:43 PM
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Join Date: Nov 2003
Location: Commonwealth of Virginia
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Limited or reduced stopping power--no where near that nose-dive feeling on a hard stop. No quick-acting power assist--more like old-fashioned hydraulic brakes where your leg muscle is all important. A sense that I need to push the brake pedal further to the floor that my other cars. Once stopped, I can push the pedal further and further towards the floor, but it never goes all the way. Truck is a 1997 2WD 5.4L 80K miles 6600 pound package with rear drum brakes; maybe 10K miles on new ceramix pads, turned rotors.

Last edited by Xtrema; 02-17-2004 at 08:45 PM.
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Old 02-18-2004, 01:23 AM
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Join Date: Feb 2003
Location: So. California
Posts: 755
Might be a booster prob also. Check this by pressing on the pedal with engine off. start truck and see if your pedal goes lower. as mentioned before there is no definative set of symptoms of master cylinder failure. You might check so external signs like fluid running down the front of the booster where cyl mounts. ABS makes it a little tougher to spot problems too.
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