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Unread 09-19-2013, 06:59 PM   #1
Brakeman62
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2001 WJ 
 
Join Date: Feb 2012
Location: Omaha, Nebraska
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Cold Weather Brakes??

I have a 2001 WJ Laredo 4.0. When I first start it on a cold morning the brake peddle is stiff and goes nearly to the floor. If I pump the peddle it will start to build back up. As the truck warms up, the brake peddle loosens up and the brakes get back to normal.
Any ideas??? Thanks!!

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Unread 09-19-2013, 09:53 PM   #2
asatxj
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If the PEDAL goes to the floor when cold and gets better, I would take a look at your booster and the vac. plumbing for it. Might have a slow leak that the system can overcome and pressurize when you get going. Are your brakes mushy all the time? when did you do your last brake job?
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Unread 09-20-2013, 02:44 AM   #3
sprocket1200
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Try new fluid with turkey baster method. Cheap and easy.

Ours improved noticeably after doing this and it was already good then!
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Unread 09-20-2013, 10:37 AM   #4
Brakeman62
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Thanks for the reply!! Brakes are not mushy all the time, only when I start it in cold weather. I just replaced both front and back brakes.
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Unread 09-20-2013, 11:25 AM   #5
Merc1973
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Quote:
Originally Posted by asatxj View Post
If the PEDAL goes to the floor when cold and gets better, I would take a look at your booster and the vac. plumbing for it. Might have a slow leak that the system can overcome and pressurize when you get going. Are your brakes mushy all the time? when did you do your last brake job?
And the Master cylinder.
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Unread 09-20-2013, 09:36 PM   #6
asatxj
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Location: West Michigan
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Only when cold sounds like maybe some moisture in the system, water will condense when it's cold and give you a "water bubble" that will get somewhat dispersed when it gets warmed up. Still somewhat spongy though. I'd do the turkey baster method and then bleed the system as step 1. If there is no change I'd replace the booster (I have two good used ones btw) and last do the MC. Unless you can find a used MC/Booster combo for cheap and do both.
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