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Unread 02-25-2010, 10:41 AM   #31
Schne
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1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
Ok I tried bench bleeding my mc again, got a few air bubbles out. Then I put it back together, and had pressure on the second push of the pedle. then about 10 seconds later. The same trouble. Does this mean the mc is bad? I am so lost, never had this much trouble with brakes before.
Any help would be great.

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Unread 02-25-2010, 11:13 AM   #32
Mike Romain
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1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,934
Ok, I will go way out there and ask you to check the front disk pads. I remember having your trouble once when the glue holding the pads to the metal backing had let go and the pad warped from heat into a c shape so the first pump pushed it flat to the rotor and the second pump held it. Then once the pedal was let off, it curled up again pushing the piston back into the caliper.

I now use the riveted on kind of pads.

Other than that maybe one more bench bleed? Mine sure took a long time to stay hard at the 1/8".
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 02-25-2010, 08:59 PM   #33
Schne
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1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
Alright, I bench bled once again. No luck. I looked at the front pads, and they appeared to be ok. I am about an evening away from taking it to a brake shop. And I am not happy about that.

Could it be the MC is yet again bad, it is a refurb??????????????
HELP
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Unread 02-26-2010, 06:41 AM   #34
Mike Romain
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1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,934
Quote:
Originally Posted by Schne View Post
Alright, I bench bled once again. No luck. I looked at the front pads, and they appeared to be ok. I am about an evening away from taking it to a brake shop. And I am not happy about that.

Could it be the MC is yet again bad, it is a refurb??????????????
HELP
yes it could be another bad one.

How well did the wheels bleed after you bench bled the MC again? Any more air bubbles?
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Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 02-26-2010, 07:30 AM   #35
Schne
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1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
I got no more air out of the bleeders, after bench bled. I used about a half a quart bleeding at the wheels. I guess I will try another MC..
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Unread 02-26-2010, 07:39 AM   #36
Mike Romain
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1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,934
Quote:
Originally Posted by Schne View Post
I got no more air out of the bleeders, after bench bled. I used about a half a quart bleeding at the wheels. I guess I will try another MC..
I would be pulling off the rear drums first and look close at the shoes. Same deal, just look for a crack between the shoe and the metal backing. That is the same as the front pads, all it takes is a crack between the friction material and the metal backing to allow the pistons to be pushed back slightly making your pedal act like that. The friction material curls up slightly when not anchored. The last ones that went bad on me still had over 3/4 of the pads left on them, they were basically still new and water/humidity got to the glue. I had a helper push on the pedal and I could see the crack in the front pads compressing slightly. I was looking for bad flex lines, expecting to see a bubble under pressure or something. Just about drove me nuts trying to get a good pedal.
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Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 02-26-2010, 07:42 AM   #37
Schne
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1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
Thanks for the info, I will have my buddy come over and help me check them tonight, thanks again.
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Unread 02-28-2010, 03:10 PM   #38
Schne
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1998 XJ Cherokee 
 
Join Date: Nov 2009
Location: cincinnati , oh
Posts: 32
Alright, I decided to get yet another MC, and since that was off, I got some new front pads to put on. I just got done installing all that and I have a good hard pedal. no sponginess, and the pressure does not disapear. Not sure which one fixed the problem, but it's fixed. THANK YOU EVERYONE, for the advise.
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