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Unread 11-03-2013, 11:29 AM   #1
my1986cj7
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brake pedal stick when pressed down

After replacing my brakes master cylinder the pedal wants to stick. I have to pull it back up with my foot. I have tried wd40 on the linkage and on the shaft of the master cylinder connected to the peddle but no luck. I check the spring and it is connected but seem not stiff enough for the new cylinder. Is it possible the new ones are stiffer. I replaced the old one because the old one was leaking. Any ideas?

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Unread 12-01-2014, 12:01 PM   #2
my1986cj7
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Ok, I still need help with this. I have the whole dash and steering wheel down with no pressure on the pedal. The master cylinder disconnected to the pivot point on pedal. Shouldn't this pedal move freely like the clutch pedal? The problem is the brakes worked fine till I replaced the master cylinder. I have bench bleed the master cylinder twice now to make sure all the air is out of it. Confused in Missouri.
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Unread 12-01-2014, 01:33 PM   #3
lucdog
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Does the brake pedal work good without the actuating rod connected?
Power brakes?
When you bench bled, did the plunger come back on its own?
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Unread 12-01-2014, 02:37 PM   #4
my1986cj7
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Quote:
Originally Posted by lucdog View Post
Does the brake pedal work good without the actuating rod connected?
Power brakes?
When you bench bled, did the plunger come back on its own?
No it is stiff even with out the actuating rod connected. I just got the whole assembly out an hour ago and the clutch moves freely but the brake is stuck solid they should be able to move independently from each other correct?
Also when I bench bleed the cylinder I used the plugs that came with it and bleed the air out of it that way. The fsm says to use hoses connected to the holes routed back to the top of the cylinder?? How far should the plunger move on the cylinder when bleeding on the bench mine only moves about 1/2 inch. I have tried to disassemble the assembly but haven't had any luck, other then mess up the thread a little bit on the bolt that goes though the assembly. I've sprayed half a can of nuts off on this thing maybe it will come apart. I have had the brakes working but you have to use your foot to pull the brake pedal up to release the brake and that was a pain in the aZZ. sorry for the book just trying to remember every thing that I have done.:bric kwall
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Unread 12-01-2014, 09:13 PM   #5
BagusJeep
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You should have two springs inside the master cylinder so when you take off the snap ring at the front which retains the assembly in there the plungers / pistons should just pop right out.

Also, I am not aware of there being a threaded rod that goes through the master cylinder. There is a push rod that goes through the boot and oushes on the curved surface of the front of the primary piston assembly but that is it.
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Unread 12-02-2014, 07:03 AM   #6
my1986cj7
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The bushings where froze up on the pedal assembly. Now I need to find a new assembly pin, and buy some new bushings to reassemble the pedal assembly. I have found the bushings but not the pin that goes though the bushings for the clutch and brake pedal assembly. Anyone know where to find one?https://www.google.com/search?q=clut...0CAgQhxw&dpr=1 the pin I need is #5 in this picture in this post.
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Unread 12-02-2014, 11:03 AM   #7
Ken4444
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I found the bushings at Quadratec don't see the pin. You may have to buy the whole assembly, or find one that can be parted out.

Or you could pull out the whole assembly, take it apart, and see if the pin can be salvaged. If it is worn, maybe it could be welded, ground, and polished. Or maybe a machine shop could make a replacement part based on the old one.

Do you have any photos of the current pin?
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Unread 12-02-2014, 11:22 AM   #8
Ken4444
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Does the part look like this?
jeep-cj-clutch-pedal-shaft.jpg  
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Unread 12-02-2014, 11:26 AM   #9
my1986cj7
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Quote:
Originally Posted by Ken4444 View Post
I found the bushings at Quadratec don't see the pin. You may have to buy the whole assembly, or find one that can be parted out.

Or you could pull out the whole assembly, take it apart, and see if the pin can be salvaged. If it is worn, maybe it could be welded, ground, and polished. Or maybe a machine shop could make a replacement part based on the old one.

Do you have any photos of the current pin?
Thank Ken I bought an assembly off of Ebay and I had to destroy the old one to get it out it was so rusted. I've already looked at all the parts places and none have the pin just the bushings. I thought about the machine shop to guess I will have them make me a new one to have a spare on hand.
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Unread 12-03-2014, 01:42 PM   #10
my1986cj7
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Quote:
Originally Posted by Ken4444 View Post
Does the part look like this?
Close but no nut in middle thanks though.
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