C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Brake problem input

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Old Jul 15, 2016 | 12:51 AM
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Default Brake problem input

1992 with 95,000.New brakes installed 3 years ago,I put around 1,000 mi per year.
So,yesterday I drove 15 miles stopped for fuel.Took off and went to stop at a light,brakes went way down close to floor.When I had left the house I had full petal.Pulled over checked fluid,it was full.Turned around and Hi tailed it home.
Today went to check the brakes.Before I started the car I touched the petal and it was a full petal.Started the car,hit the petal and was full petal.
Is this a warning the Master Cylinder is going out?Or has air got in the system some way?
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Old Jul 15, 2016 | 04:26 PM
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Reads more like a failing power booster.
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Old Jul 15, 2016 | 06:18 PM
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Originally Posted by cardo0
Reads more like a failing power booster.
Not necessarily usually when boosters go pedal is hard and hiss brake effort goes up making Please Stop moments, I feel his first hunch is closer with a Master that is Stroking Thru (leaking around it's inner seals) I would service the fluid real well and look for evidence of leaking by booster outside and start looking for a Quality master or a good re-builder.

One more side note when the pedal did it's drop did you hear the Anti lock pump or any anti lock lights I had a problem a while back with 1 of my wheel sensors not working right and it messed with the brakes big time

Last edited by s carter; Jul 15, 2016 at 06:52 PM.
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Old Jul 15, 2016 | 09:17 PM
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Originally Posted by cardo0
Reads more like a failing power booster.
Could be,brakes have never been hard.
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Old Jul 15, 2016 | 09:25 PM
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Originally Posted by s carter

One more side note when the pedal did it's drop did you hear the Anti lock pump or any anti lock lights I had a problem a while back with 1 of my wheel sensors not working right and it messed with the brakes big time
No,when it dropped it made no sound.No lights came on.Pumping did no good.

Last edited by tony58; Jul 15, 2016 at 09:46 PM.
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Old Jul 15, 2016 | 09:27 PM
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Originally Posted by tony58
Could be,brakes have never been hard.
If braking was never Sports car Stopping quality give all a look at including the booster.

Last edited by s carter; Jul 15, 2016 at 09:36 PM.
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Old Jul 15, 2016 | 09:50 PM
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Went on another 20 mile drive today.Full petal when I left the house,full petal when I got back.Can't get it to repeat the failure.I know for sure the fluid needs changing.
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