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Brakes and Tires
Ford Ranger
Jeep Wrangler Sport

Why does the brake lock during braking?

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2011-09-14 00:07:47
2011-09-14 00:07:47

Gunk build up inside the brake lines, gunk get stuck right where the line has a bolt on clamp,fluid pressure will only go to the clamp on the hose to the brake caliber but not back to the master cylinder.Two ways to check :have someone press the brake pedel,take off master cylinder cover and have them release the pedal look at the fluid return into the reservoir,it should fill fast,if it's slow most likely the line,if no flow at all it's the caliber. Or jack the front wheels up press the brake petal when release spin the wheels if its hard to spin it's the lines,if no spin it's the caliber.Please note if your car is front wheeldrive take it out of gear regardless of make and model use Wheel Chokes and emergency brakes when checking and repairing!Do not bleed the brakes flushing is alot better.

Contaminated brake shoes or pads or an ABS (Anti Lock Brake) sensor, could cause one of the wheels to lock while braking.

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If by "lock," you mean the wheel suddenly stops turning, there can be several causes:

In general, static friction is greater than dynamic friction. (Static means not moving and dynamic means moving) An example of that would be when you push something across the floor. The force needed to move the object generally decreases once that object starts moving. The same is true for your tires in contact with the road. When they are rolling, the surface of the tire is not moving relative to the road. When the tires begin to skid, they are moving relative to the road. Skidding actually slows the car less than braking just slightly below the traction threshold of the tire.

Locking due to mechanical problems: If a brake disk or drum is not uniformly shaped (warped), the braking force will not be uniform as the wheel rotates. In this case, you may find that the brakes pulse or even lock the wheels when traction is low. The solution is to resurface or replace the disk or drum.

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You have a pinched brake line. Inspect them all.

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Pull the wheels and look. I would expect to find a leaking wheel cylinder(s). When they leak, the fluid gets on the shoes and cause a lock-up situation. As you drive more the fluid spins out and the lock up is less severe. Are you losing fluid?

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Well if you pedel goes almost all of the way or does go all the way to the floor then the master cylender is bad.

you might have a leaking wheel cylinder or a caliper that sticks and does not release properly. or if it is panic braking, its just because you may not have ABS.

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EBCM stands for electronic brake control module. The purpose of this is to sense if the wheels are going lock-up during braking, and then make adjustments accordingly. If this switch fails, then your anti-lock braking system will not work properly.

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The driver would need to step on the brake pedal when braking a vehicle equipped with anti-lock brakes. FYI, the driver would also need to step on the brake pedal when braking a vehicle that is NOT equipped with anti-lock brakes. Hope this helps.

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Anti lock brakes. The system uses a computer, valves, and speed sensors to control wheel lock up during hard braking.Anti lock brakes. The system uses a computer, valves, and speed sensors to control wheel lock up during hard braking.

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ABS stands for "Anti-Lock Braking System" which means that the brakes won't lock up and cause a crash or skid.

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The technique of braking short of lockup is known as threshold braking. Modern cars have anti lock brakes to help prevent from going into full brake lockup.


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