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I just installed a clutch Master cylinder and.

Tiny
MICHAELHEBBELER
  • MEMBER
  • 1989 CHEVROLET S-10
  • 138 MILES
I just installed a clutch master cylinder and slave cylinder on a 1989 chevy s 10 with a 2.8 motor. I have not put fluid in to bleed it yet however I tried to push the clutch pedal down and it will only go half way to the floor. Before the new parts it would go all the way. Is this a normal thing to have happen before the system is bled?
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Friday, November 16th, 2012 AT 9:17 AM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
No it is not normal. Without clutch fluid, there would be no pressure and the pedal should go down completely. Check the push rod adjustment. Problem should be at master cylinder.
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Friday, November 16th, 2012 AT 10:18 AM
Tiny
MICHAELHEBBELER
  • MEMBER
  • 4 POSTS
I figured out the pedal problem. Now I am to bleeding the system. I have already used a bottle of fluid and the clutch is still not operating correctly. Any suggestions on how to bleed? When the pedal is pumped up and I release the bleeder only fluid is coming out no more air. Yet it still tries to jump when I start it and will not come out of gear. When I let out on the clutch it stalls right away with less then an inch let out. Please help
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Friday, November 16th, 2012 AT 6:53 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Is the push rod adjustment correct? If there is excessive free play, the clutch would be low. Was this the reason for the parts replacement?

Was this the procedure you used for bleeding?

BLEEDING HYDRAULIC CLUTCH SYSTEM

NOTE:
Never use fluid which has been used or bled from the system to fill reservoir.

1. Fill reservoir with clean DOT 3 brake fluid. Disconnect slave cylinder from bellhousing, leaving line attached. Hold slave cylinder at a 45 degree angle with bleeder screw facing upward.

2. Have an assistant depress clutch pedal while opening bleeder screw. Close bleeder screw and release pedal. Repeat sequence until all air is removed from system. Ensure master cylinder reservoir stays full during bleeding process.
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Friday, November 16th, 2012 AT 8:37 PM
Tiny
MICHAELHEBBELER
  • MEMBER
  • 4 POSTS
I'm not sure how to adjust the push rod. I replaced the master cylinder because it was leaking from inside the cab. I did not remove the slave cylinder to bleed. I replaced the slave cylinder because it looked rough. I also replaced the line connecting the two. How would I adjust the push rod? The truck will start but I can not get it into gear. I have had a few people tell me it is the parts.(Auto zone parts) What do you think I should do?
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Friday, November 16th, 2012 AT 9:10 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
I am not sure if the push rod is adjustable for your master cylinder. Do you had a lock nut at the push rod?

Yes, it is possible the replacement paert is bad.
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Friday, November 16th, 2012 AT 9:20 PM
Tiny
MICHAELHEBBELER
  • MEMBER
  • 4 POSTS
No lock nut. The push rod is hooked to the pedal and goes into the master cylinder. I tried to spin the rod but with no luck going in or out.
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Friday, November 16th, 2012 AT 9:50 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
That means the pushrod clearance is not adjustable. Slowly depress the clutch pedal and note how far it travel before it meets resistance.
If it is low when resistance is met, that could be a problem with the master cylinder. Did you measure the length of the push rod between the original and replacement unit?

If clutch resistance height is high, that could mean a fault with the clutch disc of plate.
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Sunday, November 18th, 2012 AT 9:53 AM

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