What causes rear drum brakes to engage too soon?
If the parking brake system is not de-adjusted properly before the brake shoes are adjusted it will cause the rear brakes to engage too soon. This is especially true of vehicles equipped with duo-servo rear drum brakes (see Figure 61.1).
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.
What causes rear wheel to lock up when braking?
Problem: One or both rear wheels lockup during braking or the rear end of the car squats when braking. Cause: Rear Wheel lockup or squatting has many causes. Here is the list of possible causes: Service and parking brake adjustment. Rear brake hardware. Shoe lands or bosses. GM clip in wheel cylinders. Brake drum condition.
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.
How do you remove the drum brake on a jeep?
Starting with the driver side drum brake, use a pair of needle nose vice grips to clamp on, unhook and remove your Jeep’s brake shoe spring. 6. Using a pair of needle nose pliers, lift up and remove your Jeep’s brake shoe adjuster lever spring. 7.
Can you adjust the brakes on a jeep TJ?
The rear drum brakes on a Jeep TJ have been designed with a self-adjusting mechanism. Typically, no adjustments are needed to the brakes unless you have just replaced the drums, shoes or have removed the shoes for other reasons. Below are instructions on how to adjust your rear drum brakes using a brake spoon adjuster tool.
How can I adjust my rear drum brake?
Below are instructions on how to adjust your rear drum brakes using a brake spoon adjuster tool. 1. Place a floor jack underneath the differential of your rear axle and raise it high enough so that the tires are lifted off the ground a bit.
Where can I buy brake shoes for my Jeep TJ?
You can find and purchase drum brake shoes, replacement hardware/spring kit, and all the other tools you need to service your Jeep TJ’s rear brakes at Autozone, Kragen, Napa and Pepboys. If needed, most of these stores should be able to resurface your old brake drums if needed for a small fee.
When do you adjust the rear brake on a car?
Most FWD vehicles self adjust when braking while the vehicle is moving forward (See Figure 61.4). Once the rears are quick set test drive the vehicle to finish the adjustment process.
How big of a nut do I need to change my rear brake?
This large nut is usually a 22 or 24 millimeter metric socket, or a 7/8” standard socket. Use a breaker bar or half inch drive ratchet to turn the nut counterclockwise in order to remove it. A traditional 3/8-inch drive socket wrench may not allow you to put enough pressure on the nut to break it loose.
Why do you use rear brakes on a car?
Rear brakes on modern vehicles are used more often than before to reduce nose dive upon braking, and reduce side-to-side/lateral transition (in hard straight line stops) as the weight shifts forward and the rear end of the car wants to follow along with it. The opposite side brakes harder to bring it back in line.
If the parking brake system is not de-adjusted properly before the brake shoes are adjusted it will cause the rear brakes to engage too soon. This is especially true of vehicles equipped with duo-servo rear drum brakes (see Figure 61.1).
Problem: One or both rear wheels lockup during braking or the rear end of the car squats when braking. Cause: Rear Wheel lockup or squatting has many causes. Here is the list of possible causes: Service and parking brake adjustment. Rear brake hardware. Shoe lands or bosses. GM clip in wheel cylinders. Brake drum condition.
How are the brakes attached to the wheel?
Fluid pressure is delivered to the disc calipers or wheel cylinders whenever you press the brake pedal. The brake shoes and pads are fixed and attached to the spindle or axle housing, and the disc and drum are attached to the wheel and its tire, which provide traction/friction against the road surface for acceleration, steering, and stopping.