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post #1 of 7 Old 01-30-2012, 08:22 AM Thread Starter
boxcar119
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1993 YJ Wrangler 
 
Join Date: Jul 2010
Location: NY
Posts: 24
Brake Question

Brake pedal had been getting soft. Now I have to pump twice to build up
pressure. If I just pump once pedal goes to the floor and e-brake light
comes on. If I pump twice no light.

Shoes and pads in decent shape

Do you think it's the MC or the booster or both ?

any way to test ?

thanks

'93 YJ 6cly Man

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post #2 of 7 Old 01-30-2012, 08:31 AM
scubamc
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1991 YJ Wrangler 
 
Join Date: Sep 2008
Location: USA
Posts: 1,392
Have you checked your brake fluid? Have your tried bleeding all your lines?
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post #3 of 7 Old 01-30-2012, 09:18 AM
DLWRUBI
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Most likely the MC is gone..
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post #4 of 7 Old 01-30-2012, 11:12 AM
69moparman
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1990 YJ Wrangler 
 
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Quote:
Originally Posted by boxcar119 View Post
Brake pedal had been getting soft. Now I have to pump twice to build up
pressure. If I just pump once pedal goes to the floor and e-brake light
comes on. If I pump twice no light.

Shoes and pads in decent shape

Do you think it's the MC or the booster or both ?

any way to test ?

thanks

'93 YJ 6cly Man
First you should check your brake fluid as stated earlier. If that's at a good level, try sitting in the seat and push the brake pedal and hold medium pressure on it. If the pedal fades to the floor, one of two things could be wrong. The plunger seal inside the master cylinder is shot or you have a fluid leak somewhere in the brake system. Check all your hard and soft lines for leakage, also remove your rear drums and look for wet areas around the wheel cylinders. If the leak is bad enough, you'll see fluid running down the inside of the tire. If there's no apparent leak, it's probably time to replace the master cylinder.
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post #5 of 7 Old 02-20-2012, 09:03 AM
Shoelessboi
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1991 YJ Wrangler 
 
Join Date: Aug 2011
Location: KALAMAZOO
Posts: 1,181
Any news on this? I'm going thru the same thing. It started off by pumping brakes.. then its now i have no pressure while its running. I bled all 4 lines.

Quote:
Originally Posted by dillonjm View Post
:The fact you even asked this question makes me want to punch myself in the face.
1991 Jeep Yj. 4cyl. 33x13.50x15 TSL Thornbirds, Super Wader Snorkel, 4" Rough Country Suspension Lift, Uniden Pro520xl Cb, 1000W Amp, 12" Rockford Fosgate P2 Sub.
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post #6 of 7 Old 02-20-2012, 09:07 AM
nembudonna
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1990 YJ Wrangler 
 
Join Date: Feb 2011
Location: northwest
Posts: 935
Get a new master,
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post #7 of 7 Old 02-21-2012, 06:55 AM
Shoelessboi
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1991 YJ Wrangler 
 
Join Date: Aug 2011
Location: KALAMAZOO
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Quote:
Originally Posted by nembudonna
Get a new master,
Im ordering one today.

Quote:
Originally Posted by dillonjm View Post
:The fact you even asked this question makes me want to punch myself in the face.
1991 Jeep Yj. 4cyl. 33x13.50x15 TSL Thornbirds, Super Wader Snorkel, 4" Rough Country Suspension Lift, Uniden Pro520xl Cb, 1000W Amp, 12" Rockford Fosgate P2 Sub.
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