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#1
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Sudden brake loss in a 76 300D
The brakes have always been fine on this car till last night. The car has been parked the last 3 weeks ans when I started it the brake light was on and the pedal went all the way to the floor. I was able to get it into the garage where I topped off the brake fluid, (it did take most of the contents of a small can) that fixed the light indicator but I still had no brakes.
I saw no leaks from the master cylinder or anywhere else but the pedal would not pump up properly and hold so the brakes seem completely gone for the moment. Anyone with any ideas what could be wrong? |
#2
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If you're pumping with no pressure and no visible leaks, I'd say you're MC is leaking into the booster. Is the fluid level in the reservoir dropping?
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Chad 2006 Nissan Pathfinder LE 1998 Acura 3.0 CL OBK#44 "Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.) SOLD 1985 300TD - Red Dragon 1986 300SDL - Coda 1991 - 300TE 1995 - E320 1985 300CD - Gladys |
#3
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It seemed I was getting some pedal pressure but it would immediately disappear. And I did not notice the fluid resevior going down.
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#4
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I'd look for vacuum leaks then. The seal between the MC and booster is a common leak as is the main vacuum hose leading directly to the booster.
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Chad 2006 Nissan Pathfinder LE 1998 Acura 3.0 CL OBK#44 "Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.) SOLD 1985 300TD - Red Dragon 1986 300SDL - Coda 1991 - 300TE 1995 - E320 1985 300CD - Gladys |
#5
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There could be several issues. One possibility is that when the fluid was low, it introduced air in the system. Another is you have a leak somewhere. If you can't see any leaks, then it could be what Chad suggested and is leaking into the brake booster.
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1983 123.133 California - GreaseCar Veg System |
#6
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The actual diaphram in the Booster can be cracked and leaking air also....
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#7
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Quote:
Quote:
If you lose vacuum, the pedal would get very hard since the booster would have no vacuum to assist in driving the shaft in the MC. I too am leaning toward air in the system being the cause based on the info shared so far.
__________________
Chad 2006 Nissan Pathfinder LE 1998 Acura 3.0 CL OBK#44 "Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.) SOLD 1985 300TD - Red Dragon 1986 300SDL - Coda 1991 - 300TE 1995 - E320 1985 300CD - Gladys |
#8
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The fluid lost originally had to go somewhere. If it isn't on the ground where the car was parked then it's probably in the brake booster. Has to be somewhere !
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#9
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Appreciate the feedback from everyone. Turns out it was a master cylinder that had to be replaced a and a few worn brake line as well.
Job is done and everything works fine again. Thanks again.. |
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