boat73

I just purchased a 2000 dakota sport 4x4 quad cab and am having an
issue with the brakes. Normal stopping works fine but, if I hit the
brakes hard the drivers side front wheel will lock up and skid
followed by an electric hummins sound from the front passanger side
that will last a second or 2. The noise sounds as though something is
resetting.

no dash lights are on but, I am trying to trouble shoot it and make
sure it is not a safety concern

Thanks in advance!!!

honeybs

Have you checked for codes in the brake computer?

beekeep

big red truck

Old style troubleshooting also works here:

Whenever I buy a used vehicle, I bleed the brake fluid and put in
synthetic DOT 3 or DOT 4 per the factory specs.

You see, brake fluid that is NOT synthetic is hygroscopic. Some vehicle
makers prohibit non-synthetic based brake fluid. Most makers recommend
full drainage and replacement with new fluid every two years.

It absorbs minute quantities of water, overnight, through the breather
vent in the master cylinder. If not changed out, then, it eventually
gets to be wet enough to boil upon hard stopping, when the brakes can
hit 1300 degrees on the rotor surface/disc pads.

Most auto parts stores now sell only synthetic brake fluid.

peterd

To be a technical ass, there is no breather vent on a master cylinder
that exposes brake fluid to air. There is an 'air-tight' diaphram
between any breather and the fluid. Now that 'air-tight' attribute is
questionable however!

But absolutely, brake fluid does absorb moisture from many places (it
even 'bleeds' into the system at the caliper seals) and flushing is
always a good idea--at a minimum each time the pads are replaced, but
as often as annually if possible.

von schoenvorts

I've seen where a piece of debris in the brake line can cause this.
There could also be a cut inside the brake hose that acts like a
flapper. When you apply the brakes this piece of hose 'closes' and
acts like a dam preventing the fluid from returning when you get off
the brakes. The caliper holds tight until the pressure eventually
pushes the piece of hose back.

Steve