Question about 1989 GMC K1500

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I have a new clutch but my truck wont go into gear

I have new slave cylinder new hydraulic line new clutch master cylinder new clutch disc and set and new trans i bled the the line for 3 days and have good clutch pedal but it wont go in gear{like there is little or no clutch]

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  • 211 Answers

You might have somebody press the pedal as you get down and check the clutch travel. Might have an adjustment on the clutch arm.
Could have wrong pressure plate, did you match them. I would check the travel first.

Posted on Jan 19, 2015

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Posted on Jan 02, 2017

ifixgms
  • 64 Answers

SOURCE: 1995 gmc sierra clutch pressure problem

could be wrong here but sure sounds like its out of fluid at the "master cylinder" look near the brake master cylinder for a seperate little container for the clutch. bleeding is tricky because it is small and wants to run out of fluid quick. you have to keep adding each time you bleed. Hope I helped. Thanks

Posted on Apr 06, 2009

polarcycle
  • 1392 Answers

SOURCE: Clutch wont engage

With the hydraulic systems, there is no adjustment. So what pedal travel you have is likely normal for that vehicle.

Posted on May 30, 2009

  • 66 Answers

SOURCE: Poor Braking power- new cylinder-new lines new ABS module -bled

i have ran into this problem , but on earlier gm products---check the local dealership or a well known mechanic shop that has all data and check for bullitains. what i had found out was there was some trucks that gm had installed the wrong power booster . not saying your booster is to blame, but may be a great place to look seeing you replaced abs modules ,master cylinder ect---hope that helped out!!

Posted on Jul 08, 2009

  • 278 Answers

SOURCE: I replaced the slave cylinder on my 91 G.M.C.

Yes, get a pro-bleeder. They are around $ 75-$90 but well worth it.

Posted on Oct 15, 2009

wracefans24
  • 1985 Answers

SOURCE: 1997 GMC Sierra 5.7 changed master cylinder

check under your master cylinder,is there another clyinder below with one line in and one line out,if you do I found this is for the Abs to the rear,I had to replace this it was full of air,and did exactly what yours is now

Posted on Dec 09, 2009

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My 1999 accord wont shift into gear while its on but will when its off its a 5 speed.


It's your hydraulic clutch system that probably isn't working. When you press the clutch pedal down, it causes the clutch master cylinder to put pressure in the line to the transmission's little "slave cylinder" that operates the clutch inside the transmission bell housing. This disengages the engine from the transmission so you can shift gears. It's probably not putting the slave cylinder to work by hydraulic pressure. The clutch master cylinder is mounted on the firewall, similar to the brake master cylinder, the clutch cylinder has a reservoir and you may need to add brake fluid to it. If it is dry, then you will need the system bled at the slave cylinder by a pro or someone who understands how. Pretty simple, really, just like bleeding brakes. Also the clutch master cylinder can develop internal leaks and this will lead to loss of clutch.

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1 Answer

Wont go in gear when on it only goes in gear when car off


It's a manual transmission, then? If it is, your clutch is not working. You need to check at the transmission's bell housing to see if the clutch pedal being depressed causes the clutch fork to move-either forward or backward, it should move about an inch with the pedal pushed to the floor.. The clutch pedal will either be cable operated, or it will be a hydraulic clutch with a clutch master cylinder on the firewall, and a steel tube going down to the bell housing, where a small "slave cylinder" operates the clutch fork.

If you see the clutch fork move a fair amount, at least an inch, then you probably need a new clutch disc and pressure plate. A clutch job means removing the transmission to replace the clutch.

If the clutch fork does not move, either the cable has too much slack-for cable operated clutches, or the hydraulic unit has a problem-for hydraulic operated clutches. One of your hydraulic cylinders may be bad, either the clutch master cylinder or the slave cylinder.

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The Clutch Master Cylinder or the Clutch Slave Cylinder has a leak. From under the dashboard, located the Clutch Master Cyliner Boot and pry one side open. If hydraulic fluid drips out, the piston seal(s) in the cylinder are worn. You'll need to replace the cylinder.

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If you mean you step on the clutch, put transmission in gear and release clutch with no engagement (pedal returns to top position) there is a good chance your clutch disc or pressure plate, or both are worn out and need replacing.
If your clutch pedal is going to the floor and not returning there could be a leak in the system, a bad clutch master cylinder or a bad slave cylinder on the transmission. Check the fluid level in the clutch master cylinder. If it is low or empty you have a leak or component failure. Visually inspect clutch master, line, slave cylinder for fluid leaks. replace as needed. If hydraulics are o.k., suspect clutch disc/pressure plate.

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1 Answer

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Well, it would shift easily with engine off, because the transmission input shaft is not turning. Engine running and clutch engaging good, the input shaft would again be stationary and allow smooth shifting.
What you have to determine is if the clutch disc or pressure plate is bad (a new clutch is needed), or if the pedal hydraulic system has a malfunction. When you push the pedal down, a rod from the top of pedal pushes into the clutch master cylinder bolted to the firewall under the hood. This cylinder has a reservoir filled with brake fluid. When the rod forces fluid from the clutch master down a steel line and into the clutch slave cylinder down on the transmission bell housing, the hydraulic pressure forces a plunger from the slave cylinder to extend and push the clutch fork lever a small amount, enough to force the clutch release bearing (aka throw-out bearing) against the pressure plate. This relieves pressure on the clutch disc and input shaft becomes stationary for easy shifting.

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Need to know year and engine size. I know that the 1999 Dakota 2.5L clutch hydraulic system comes as a pre-charged, completely sealed system including the reservoir, master/slave cylinders and the connecting lines. There is no means of disassembly. If you use aftermarket parts, you must buy the entire aftermarket set and assemble and bleed it.

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you may have a faulty clutch master cylinder or faulty clutch slave cylinder- leaking clutch fluid. most of the time both are replaced at the same time which should be recomended by your mechanic, the bolts to the master cylinder are very hard to get to and require the right tool.
you should be able to move car forward by selecting 1st then cranking engine till it starts, gear changes while driving are hard but not impossible. i recommend a tow truck to a local repairer.

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