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Chevy truck soft clutch pedal

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RustyFarmall

07-25-2005 12:47:04

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2001 K-3500, 8.1 engine with 6 spd. manual trans. This has happened twice now, while driving interstate highways during hot weather, eventually the pedal goes soft, and does not fully disengage the clutch when the pedal is depressed. If I pull up to a gas pump and shut the truck off for a few minutes, then the problem goes away, only to return a few miles on down the road. If I park the truck for a considerable length of time, the problem goes away and probably will not return. This happens only when the temperature is at or near 100+, so I know that it is heat related. My dealer offers no answers except to replace the clutch master cylinder. The truck has about 38,000 miles. Any ideas?

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Allan in NE

07-25-2005 16:45:24

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Re: Chevy truck soft clutch pedal in reply to RustyFarmall, 07-25-2005 12:47:04

Rusty,

Makes me no never mind a-tall, but I'm telling you, if you drain that fluid out, you are going for a ride you won't easily soon forget.

They have to be bleed from the bottom up and GM even went so far as to ship the replacements as an already fluid-filled, all-components-in-one-assembly unit because they are such a hassle.

Like I say, it's your truck, but I'd sure think twice about trying to change the witch's brew in that clutch circuit.

They are the main reason I have grey hair. :>(

Allan

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RustyFarmall

07-25-2005 18:28:00

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Re: Chevy truck soft clutch pedal in reply to Allan in NE, 07-25-2005 16:45:24

Yes, that's pretty much what the service writer at the dealer told me the first time the problem showed. It's pretty much a self contained unit, not easily serviced, just replace the entire unit. It has not totally failed yet, I think I will leave it alone, and try to remedy the problem in some other way.

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the tractor vet

07-25-2005 16:28:03

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Re: Chevy truck soft clutch pedal in reply to RustyFarmall, 07-25-2005 12:47:04

Well it is not your brakes like my old 88 ford 350 with a 460 in it it would boil the brake fluid out of the anti lock control vave that some bone headed engineer placed next to the left exhust pipe. and ya had no breaks till you went to the right rear wheel and bleed the air out. the engine compartment is not letting the heat out and like others have said change the fluid , i am not sure if the master cylinder and slave cylinder will be affected with the dot 4 or not . Try and find some of that heat reflective tape that the racers use and wrap the line and master cylinder and slave cylinder.

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marlowe

07-25-2005 15:14:55

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Re: Chevy truck soft clutch pedal in reply to RustyFarmall, 07-25-2005 12:47:04

also use DOT 4 brake fuild it has a higher boiling point and will not get air in it like the DOT 3 it came with

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RustyFarmall

07-25-2005 15:24:14

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Re: Chevy truck soft clutch pedal in reply to marlowe, 07-25-2005 15:14:55

Thanks, I will give that consideration. The next step will be to find the bleeder screw so I can replace what is in it now.

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Allan in NE

07-25-2005 13:53:27

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Re: Chevy truck soft clutch pedal in reply to RustyFarmall, 07-25-2005 12:47:04

Rusty,

These guys nailed it. That plastic line is too close to your exhaust for extremely hot weather.

Move it as far away as possible and wrap it in tin foil. It has been a derned problem every since GM went to that hydraulic clutch. Especially on the big blocks.

Allan

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RustyFarmall

07-25-2005 13:57:37

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Re: Chevy truck soft clutch pedal in reply to Allan in NE, 07-25-2005 13:53:27

Thank you Allan, I really didn't think I was the first one to experience this problem. I'll stick my head under the hood and see what I can come up with. I've tried to eyeball the thing, but it is really tight under that hood.

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Allan in NE

07-25-2005 14:40:11

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Re: Chevy truck soft clutch pedal in reply to RustyFarmall, 07-25-2005 13:57:37

Rusty, ya 'bout gotta crawl under the thing to see how it passes that exhaust.

Allan

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RustyFarmall

07-25-2005 15:22:04

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Re: Chevy truck soft clutch pedal in reply to Allan in NE, 07-25-2005 14:40:11

I was just out there and took a look, it appears that the line is far enough from any heat source that there shouldn't be any problem, but I will see if I can't jerry-rig some sort of heat shield anyhow.

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old

07-25-2005 13:24:15

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Re: Chevy truck soft clutch pedal in reply to RustyFarmall, 07-25-2005 12:47:04

Now this is just what I have heard before and may or may not be true. Any how the fluid maybe boiling in the line which causes it to sort of vapor lock, pumping the pedel may help by the way but yes I know it makes it a little harder to shift. Guess maybe you need to be like us old truck drivers and double clutch in all the gears.

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RustyFarmall

07-25-2005 13:53:26

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Re: Chevy truck soft clutch pedal in reply to old, 07-25-2005 13:24:15

Double clutching doesn't make any differance, I tried it. The real problem comes when I take the exit ramp and then have to navigate through several stop lights. The clutch will fully engage with the pedal only about 1/2" off the floor.

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Redmud

07-25-2005 13:19:53

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Re: Chevy truck soft clutch pedal in reply to RustyFarmall, 07-25-2005 12:47:04

I don't know if it was the reason or not, but I have seen trucks with aluminum foil wrapped on the the plastic hose from the master to the transmission. I didn't ask why, but the plastic hose may be expanding from the heat when you push the clutch.

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