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5/14/17 7:56pm - Original Message: 'Brake problem'
Red
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Hemet, CA - USA

Vette(s):
1986 convertible, bright red, white top, red interior

Joined: 3/24/2013
Posts: 21
Half way through my Sunday afternoon drive I developed a brake problem in my 86 Corvette convertible. I went to stop , the car stopped but the brake pedal suddenly felt spongy and slowly sank to the floor. The brake warning light also came on when the pedal got to the floor. I pumped the brakes, the warning light went off and the brakes worked normally. However if I held my foot on the pedal it would go to the floor and the light would come on again. I made it home without incident by pumping the brakes each time I needed to stop.
When I was home I immediately checked the reservoir for brake fluid and it was full! I checked each wheel and the area around the reservoir but could detect no sign of leaks.
My gut instinct tells me that the master cylinder has failed. I would like to confirm this with your experiences before I order a replacement Master cylinder.
Thanks for any input you can give to me. 
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5/15/17 7:35pm - Reply: 'Re: Brake problem'
Strats-N-Vettes
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Atchafalaya Basin, LA - USA

Vette(s):
Black 1979 L-82 Black 1996 LT1 Black 1999 Coupe

Joined: 3/20/2009
Posts: 403
Yeah...sounds like the master cylinder.

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5/16/17 2:27pm - Reply: 'Re: Brake problem'
redvette89
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Huron, OH - USA

Vette(s):
1989 Red Convertible - 160,000 fun-filled miles -

Joined: 12/5/2009
Posts: 179
I rebuilt mine a few years ago with a kit I got from NAPA, easy straightforward project. I didn't get much warning like you did, mine went out all at once and pumping the pedal barely made the car slow down. Fortunately I was only 2 or 3 miles from home but it was a nerve racking ride 

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5/16/17 10:53pm - Reply: 'Re: Brake problem'
Adams' Apple
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Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.

Joined: 3/18/2009
Posts: 2078
The master cylinder is bleeding back internally....that is why you don't see any external leaks, then the reservoir is full. Rebuild or replace.....stay safe!! 

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