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brake pedal going to the floor but no fluid leak

brake pedal going to the floor but no fluid leak

Postby mikey92 [OP] » Mar 22 2012, 1:29am

Hey guys i have a 1992 k1500 nothing done to it completely stock. I took the truck on a 30 minute drive the other day and on the way back home my brake light came on and the pedal goes almost to the floor. I can still stop. i looked all around the truck for leaks from brake fluid there is none and the brake resiviour (sorry for the spelling) is still full. PLease help and shoot me some ideas on what could be happening thanks.
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Firing on 1 cylinder [L1]
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Re: brake pedal going to the floor but no fluid leak

Postby ASTE25ASTE25 is online! » Mar 22 2012, 1:37am

It sounds like the master cylinder is bad.
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Re: brake pedal going to the floor but no fluid leak

Postby mikey92 [OP] » Mar 22 2012, 11:15pm

thanks buddy ill look into it is there a way of telling if its bad with out just changing it out?
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Re: brake pedal going to the floor but no fluid leak

Postby ALLAN » Mar 22 2012, 11:26pm

Last time I was looking at one it was only around $80 for my truck which is newer. If it was me personally I would just put a new one just to avoid future problems. Plus I think Autozone has a lifetime warranty on there products.
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Re: brake pedal going to the floor but no fluid leak

Postby mikey92 [OP] » Mar 22 2012, 11:51pm

yea i just started looking them up they aren't bad at all i found one on summit racing for 47 bucks just hate to put something nice and new on there before i even get around to pulling out the motor and rebuilding it lol
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mikey92
Firing on 1 cylinder [L1]
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Posts: 13
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Joined: Mar 11 2012, 4:59am
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Extra Info: 1500 4x4 350 5.7l
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Re: brake pedal going to the floor but no fluid leak

Postby ASTE25ASTE25 is online! » Mar 23 2012, 12:05am

There is really no way to tell other than changing it out. It is showing the classic symptoms of a bad master cylinder though. Usually what happens is the seals inside stop sealing, allowing fluid to pass and not build the pressure needed to expande the pistons in the calipers/wheel cylinders. They will sometimes leak fluid into the power brake booster, but not always.
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2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
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Re: brake pedal going to the floor but no fluid leak

Postby pkazsr » Mar 26 2012, 2:56am

I just today replaced all rotors and rear pads on my 01 Silverado. I did disconnect the fluid line on the front caliper and the fluid drained out. I cannot get the bleeder plug out so the air in the caliper is allowing the petal to hit the floor, I think.
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Re: brake pedal going to the floor but no fluid leak

Postby ASTE25ASTE25 is online! » Mar 26 2012, 8:19am

Simple fix. Go get a remanufactured caliper (they are really not that badly priced), install it and bleed the brakes.
Jordan
2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
6.6L Duramax/Allison 6 speed
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