Need help regarding low pressure on clutch pedal! -
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post #1 of 5 Old 06-21-2016, 03:35 PM Thread Starter
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1991 YJ Wrangler 
Join Date: Jun 2014
Location: Newburgh
Posts: 70
Need help regarding low pressure on clutch pedal!

Hello there, I have a 1991 2.5L 5spd YJ and recently, I have been having problems with my clutch pedal pressure being very low and eventually not being able to disengage the clutch and not allowing me to change gear. I tracked it to a leaking master cylinder and replaced it, everything was fine for about 3 weeks but then, just yesterday, I noticed the same thing was happening and I was unable to disengage the clutch, I checked the master cylinder and everything was full, there was no leak so I bled the clutch out using the little bleeder valve under the passenger side. That sorta fixed it, but I still had a bit of resistance when shifting so I decided to bleed it out again and now there is absolutely no pressure in the pedal. There are no leaks, the master cylinder, slave cylinder, and clutch are brand spanking new. Am I bleeding it wrongs or what can I do to fix this?

thefunkbassist is offline  
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post #2 of 5 Old 06-25-2016, 07:26 PM
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1995 YJ Wrangler 
Join Date: Apr 2012
Location: Hanover
Posts: 80
Could be you got a bad master cylinder. I just went thru that myself, the second one worked. Hard to find parts that aren't cheaply made overseas.
jimmyjamster is offline  
post #3 of 5 Old 06-26-2016, 12:45 AM
Web Wheeler
1989 YJ Wrangler 
Join Date: Aug 2014
Location: Cleveland
Posts: 6,034
A couple possibilities:

1.) you did not properly bench bleed the master cylinder before installation. Hope for this. Watch some clutch master cylinder bench bleed videos on youtube.

2.) you did not properly bleed the assembled system. If it was your first time, this is very possible. Read about all the methods and tricks, then try again.

3.) your slave cylinder went out. By councidence of age and wear, or because the new stronger master cylinder overwelmed it.

4.) it is possible that your new master is bad. NOS parts can have rubber that is 25 years old... Rubber lasts for 8 years.
mike134 is offline  
post #4 of 5 Old 06-26-2016, 11:39 AM Thread Starter
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1991 YJ Wrangler 
Join Date: Jun 2014
Location: Newburgh
Posts: 70
I just finished installing a new clutch master cylinder and it is doing the same thing even after trying various bleeding methods. I am about to throw in the towel and just take it to a shop
thefunkbassist is offline  
post #5 of 5 Old 06-26-2016, 11:48 AM
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Join Date: Dec 2004
Posts: 9,577
The slave is a pain in *** to bleed... It also could be bad.... they have been known to go bad out of the box..
Its why I hate them.. rather just swap to the external slave and be done with that
Jeepsr4me is offline  

clutch , master cylinder , no pressure

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