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2001 DTS(140K), 2000 ETC(284K), 1990 allante( 80K)
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1,915 Posts
Discussion Starter #1
well i just took out my 94 for a beat around and it feels like my breaks are to the floor.
if i'm just idling in gear and then hit the breaks usually it will stop on a dime and kinda "throw" you forward. this will just SLOW DOWN and slowly come to a stop.
i was thinking about break oil. but the only oil spot is from the engine oil.
what could cause this ?
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,987 Posts
If the pedal sinks to the floor and there are no external leaks, the master cylinder seals are shot. R & R the master cylinder.
 

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Registered
2001 DTS(140K), 2000 ETC(284K), 1990 allante( 80K)
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1,915 Posts
Discussion Starter #3

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,987 Posts
Yes, you R & R the whole M/C.
Yes, that's the part. I'd stay away from a reman though.
Not a hard job at all. Just read the instruction and bench bleed it first. Then bleed the lines at the M/C again after replacement.
 

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2000 STS RHD 194,150 miles. what's a speed limiter???
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219 Posts
if your car has ABS you may have a faulty pump.
a sticking valve may cause the pedal to hit the floor, giving the impression of a faulty master cylinder.
 

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Registered
2000 STS RHD 194,150 miles. what's a speed limiter???
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219 Posts
you only get a code for an electrical fault, sticking valves are mechanical, so no code.
the FSM has a nice section all about testing the ABS pump with tech 2.
 
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