What causes rear brake drag or lockup drum brakes?
What causes rear brake drag or lockup drum brakes?
The first and most common are those caused by mechanical problems in the rear brakes. The second are those caused by hydraulic problems in the system. Hydraulic problems are far less common but should not be overlooked. When applying step 4 in the 5 step diagnostic process it is important to get into the habit of listing the possible causes in
Can a out of round drum cause rear wheel lockup?
Brake drum condition should be factored in when determining the cause of rear wheel lockup. An out of round brake drum or drums that vary in diameter too much from side to side could cause a one wheel lockup condition (Figure 61.8). Measuring drum runout or out of roundness is not easy in the field.
What can cause a rear wheel lockup problem?
Rear wheel lockup problems come in two broad categories. The first and most common are those caused by mechanical problems in the rear brakes. The second are those caused by hydraulic problems in the system.
The first and most common are those caused by mechanical problems in the rear brakes. The second are those caused by hydraulic problems in the system. Hydraulic problems are far less common but should not be overlooked. When applying step 4 in the 5 step diagnostic process it is important to get into the habit of listing the possible causes in
Why are the hold down Springs on my rear brake so weak?
Hold down springs are designed to keep the brake shoe firmly against the backing plate. If the hold down springs are weak then the shoe could cock causing a binding condition. The replacement of rear shoe hardware should be suggested each time the rear brake shoes are replaced to prevent this from happening.
What should I do if my parking brake wont move?
To check the parking brake on this type of vehicle grab the strut rod and try to move it toward the primary shoe. It should move between 1/16” and 1/8” of an inch. If it won’t move then de-adjust or repair the parking brake system.
What kind of brake does a GM FWD vehicle use?
A prime example of this are GM FWD vehicles that are equipped with duo-servo rear drum brakes. Most FWD vehicles use a non-servo rear drum brake because of the braking balance of a FWD vehicle. These GM vehicles are “over-braked” in the rear which makes them very sensitive to rear brake problems.
Why do I have drag on my brake pads?
If the rotors are warped, you will experience a drag while turning the rotor followed by the rotor turning easy. This situation will then repeat for each rotor rotation. To correct this, replacement of the rotors and pads will be necessary.
What causes brake drag when replacing master cylinder?
This situation is usually remedied by replacing the master cylinder. We see a lot of brake drag problems caused by a master cylinder that is too full of fluid. If the system is overfull, there may not be enough room in the reservoirs for the fluid to return.
Can a caliper not release cause brake drag?
Just like with the master cylinder not releasing causing the brake drag, a caliper not releasing and staying applied can do the same thing. If only one position is dragging, this could be the case.
Can a brake rotor be a brake drag?
To correct this, replacement of the rotors and pads will be necessary. This situation could come across as a brake drag but is a drag due to wheel bearings being seized due to a lack of grease or over tightening during installation. The easiest way to diagnose this is to remove the caliper from the rotor and turn the rotor.
