brake problem
Elder User
Joined: Apr 2007
Posts: 617
Likes: 0
From: Los Alamos
You sure your rears are adjusted correctly?
Also, does yours have that stupid RABS valve in it?
Also, does yours have that stupid RABS valve in it?
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Elder User
Joined: May 2007
Posts: 754
Likes: 1
From: Solon, Ohio
Have you checked your fluid level ??
If your fluid level is real low, you can get air in the system when going around turns, or going up and down steep grades.
Did this phenominum happen all at once, or seem to come on over a period of time ??
I would suggest making sure that the rears are adjusted up then bleeding system.
If your fluid level is real low, you can get air in the system when going around turns, or going up and down steep grades.
Did this phenominum happen all at once, or seem to come on over a period of time ??
I would suggest making sure that the rears are adjusted up then bleeding system.
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New User
Joined: Oct 2007
Posts: 6
Likes: 0
Originally Posted by netscaner
Have you checked your fluid level ??
If your fluid level is real low, you can get air in the system when going around turns, or going up and down steep grades.
Did this phenominum happen all at once, or seem to come on over a period of time ??
I would suggest making sure that the rears are adjusted up then bleeding system.
If your fluid level is real low, you can get air in the system when going around turns, or going up and down steep grades.
Did this phenominum happen all at once, or seem to come on over a period of time ??
I would suggest making sure that the rears are adjusted up then bleeding system.
Junior User
Joined: Feb 2008
Posts: 66
Likes: 0
it could be the master cylinder, or your vaccum advance to help with braking. if you have a vaccum leak then by you depressing the pedal while the truck is off it will pressurize the master cylinder manually. but when the truck is on and you have vaccum you dont really touch the master cylinder. the vaccum does all of this for you. i would suggest to look for a vaccum leak
Mountain Pass
Joined: Feb 2007
Posts: 121
Likes: 0
From: Central Georgia
Sounds like a master cylinder given the time during use. But the spongy and low break is odd. Usually the pedal will sink slowly to the floor with a bad MC. Also can you pump it and firm up the break with the truck running only for it to start sinking again? That would almost certainly indicate a master cylinder. A reman. one will run you about $40 plus a core. It's an easy, though time consuming fix.
Someone mentioned the RABS Hydraulic Control Valve and you may want to check this. It's located below the MC and and is hooked into the brake lines. At the front of this valve you'll see a large hex plug on the end. Unscrew this, remove the spring inside, and replace the plug. Pump the brake pedal a few times. If the pedal stays up you've diagnosed the problem. The valve has failed in the open position. You can drive it this way, but you won't have ABS. Unit is replaced as a whole and runs about $90 plus a core charge.
Someone mentioned the RABS Hydraulic Control Valve and you may want to check this. It's located below the MC and and is hooked into the brake lines. At the front of this valve you'll see a large hex plug on the end. Unscrew this, remove the spring inside, and replace the plug. Pump the brake pedal a few times. If the pedal stays up you've diagnosed the problem. The valve has failed in the open position. You can drive it this way, but you won't have ABS. Unit is replaced as a whole and runs about $90 plus a core charge.