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Scott
Dodge Dakota
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1/18/2009
18:17:28
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 Subject: Brakes
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Message:
The front brakes will lock up and the rear brakes are not stopping at all. ABS has been bypassed to see if the rear brakes will work but this has not made a difference. I have replaced the master cylinder and the combination valve. Any ideas ?
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Kowalski
GenIII
1/19/2009
10:38:55
| RE: Brakes
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Message:
Did you try adjusting your rear brakes ?
Lead, follow, or get out of the way
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Scott
Dodge Dakota
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1/19/2009
16:08:58
| RE: Brakes
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Message:
Yes, they are adjusted so they have just a little drag. They still don't seem to work.
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TexasTodd
GenIII
1/19/2009
19:08:55
|  RE: Brakes
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Message:
1st, what year and body style.
2nd, please elaborate. I think you are saying the front brakes work well, by not the rear brakes, right?
I'm not saying you're wrong, just wondering what kind of tests, or reason that you find this is the case. If you've replaced the valves, etc., you make sure the brake lines are all bleed correctly (air out of the line), right?
Drive it like its paid for!
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Steven Roark
Dodge Dakota
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1/20/2009
16:14:48
| RE: Brakes
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Message:
It don't matter what year, Todd. You are to stupid to answer his question. You are a fracking tard just like your son.
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Scott
Dodge Dakota
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1/20/2009
16:25:06
| RE: Brakes
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Message:
2000 Dakota 2 WD Extended cab 3.9 engine Automatic . The brakes were bled correctly and I'm sure that all of the air is out of the lines. Where I live (Northern Indiana) it's easy to find out if the brakes are working crrectly. After 40" of snow, the roads are snow and ice packed. Just touch the brakes and the fronts are locked up and the rears are still turning.
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daddio
Dodge Dakota
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1/20/2009
16:40:48
| RE: Brakes
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Message:
i'd start by jacking up the rear end and check by rotating the wheels and applying the brakes. if you bled the brakes properly you should have seen fluid getting to the rear wheel cylinders. if so, then either the cylinders themselves are stuck or the hardware inside the drum is the culprit.
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Sam Watson
Dodge Dakota
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1/20/2009
18:06:51
| RE: Brakes
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Message:
I am going to hazzard a guess: There is something amiss with the CAB (controller antilock brakes). It is the device that uses data from the wheel speed sensors to control the amount of braking applied to the L Front, R Front and Rear Linked brakes. Check out Chapter 5 of the Factory Service Manual if you have it.
Here is an excerpt:
The CAB monitors wheel speed sensor inputs con-
tinuously while the vehicle is in motion. However,
the CAB will not activate any ABS components as
long as sensor inputs indicate normal braking.
During normal braking, the master cylinder, power
booster and wheel brake units all function as they
would in a vehicle without ABS. The HCU compo-
nents are not activated.
The purpose of the antilock system is to prevent
wheel lockup during periods of high wheel slip. Pre-
venting lockup helps maintain vehicle braking action
and steering control.
The antilock CAB activates the system whenever
sensor signals indicate periods of high wheel slip.
High wheel slip can be described as the point where
wheel rotation begins approaching 20 to 30 percent of
actual vehicle speed during braking. Periods of high
wheel slip occur when brake stops involve high pedal
pressure and rate of vehicle deceleration.
The antilock system prevents lockup during high
slip conditions by modulating fluid apply pressure to
the wheel brake units.
Brake fluid apply pressure is modulated according
to wheel speed, degree of slip and rate of decelera-
tion. Sensors at each front wheel convert wheel speed
into electrical signals. These signals are transmitted
to the CAB for processing and determination of
wheel slip and deceleration rate.
The ABS system has three fluid pressure control
channels. The front brakes are controlled separately
and the rear brakes in tandem. A speed sensor input
signal indicating a high slip condition activates the
CAB antilock program.
Two solenoid valves are used in each antilock con-
trol channel. The valves are all located within the
HCU valve body and work in pairs to either increase,
hold, or decrease apply pressure as needed in the
individual control channels.
The solenoid valves are not static during antilock
braking. They are cycled continuously to modulate
pressure. Solenoid cycle time in antilock mode can be
measured in milliseconds.
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wow
Dodge Dakota
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1/21/2009
12:00:41
| RE: Brakes
IP: Logged
Message:
Start with the basics so you Know were you are at. As noted above-remove the drums and be SURE that all four pistons in the wheel cylinders,a re FREE. If they are stuck or binding, you will not get enough pressure to the shoes to stop correctly but appear to be working.
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