What are the steps necessary to follow when replacing drum brake linings?
Part 1 of 4: Prepare the vehicle
- Materials Needed.
- Step 1: Loosen the lug nuts of the vehicle.
- Step 2: Secure the vehicle on jack stands.
- Step 2: Remove the brake drum.
- Step 3: Clean the drum brake assembly.
- Step 4: Inspect the brakes.
- Step 5: Disassemble the brake drum assembly.
- Step 6: Remove the brake drum shoes.
When inspecting the brake assembly you should ensure?
There are three things to check when it comes to your brake pedal. The brake pedal’s height should be checked along with measuring free play and the brake pedal reserve distance. All of these measurements should be compared with the vehicle manufacturer’s specifications.
When inspecting the drum brake you should look for all of the following except?
Wheels on the Bus
Question | Answer |
---|---|
When inspecting the drum brake, you should look for all of the following EXCEPT | Leaking fluids |
To improve visibility during severe or stormy weather, what must be secure, undamaged, and operating smoothly and correctly? | Wipers/Washers |
What parking brake has a deeper offset than normal?
The rotor has a deeper offset than normal, giving the appearance of a top hat. The offset portion allows room for a drum surface within the center of the rotor. Drum brake shoes are mechanically forced outward into contact with the inside of the brake drum, which locks the wheel.
What does drum brake diagnosis start with?
One of the first symptoms of bad or failing drum brakes is unusual brake pedal feel. If the brake drums are worn excessively they can cause vibrations that may be felt in the pedal. Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal.
What tools do you need to properly perform a drum brake inspection?
- brake hardware. clearance gauge. drum brake micrometer.
- drum in hat. floating drum. grabbing.
- holddown spring tool. pulsation. return spring tool.
How do you know when drum brakes need replacing?
Technical Bulletins
- Inconsistent brake pedal feel. If the rear brakes are drum brakes, the driver may feel vibrations under braking.
- Hand brake feels loose. If the hand brake requires a hard yank to keep the car from rolling off, chances are the brake shoes need replacing.
- Scraping noise while braking.
What procedure should be followed if a brake drum is found to be excessively scored?
This problem is indicated by a defined, grooved appearance on the braking surface of the drum and excessive lining wear. If the scoring is severe and the drum is within the recommended inside diameter limitation (see note below), then the drum could be machined to remove the scoring.
What is considered the minimum wear limit for a drum?
0.060″
What is the minimum brake thickness allowed by DOT?
3.2 mm
What is the maximum allowable brake drum diameter?
422.1 millimeters
What is brake drum diameter?
Drum outer diameter: 260 mm. Inner Brake Drum Height: 51 mm.
Do drum brakes need to be adjusted?
Drum brakes usually need to be adjusted when the brake pedal has to be pressed down a lot before the brakes engage. Adjustments can be done only on brakes that are in good shape. Keep in mind that not all drum brakes are adjustable.
How often do drum brakes need replaced?
Drum brakes rarely need replacement, only every 200,000 miles would your drum brakes need to be replaced. However, you should get your drum brakes serviced every 5000 – 7000 miles or every 6 months during your service.
What is a big disadvantage of the drum brake?
Drum brake disadvantages Excessive heating can happen due to heavy braking, which then can cause the drum to distort, and thus cause vibration under braking. Under hard braking, the diameter of the drum increases slightly due to thermal expansion, the driver must press the brake pedal farther.
How long do rear drum brake pads last?
150,000 miles
Do rear drum brakes have wear indicators?
rear shoes dont have wear indicators like the front pads…. you just need to take the drum off and look at them…
How do you fix squeaky rear drum brakes?
The squealing noise of high-metal brake pads can be helped by adding shims. Shims can be installed on the reverse side of your brake pads, alleviating the squealing noise. Avoid high-metal brake pads altogether by buying quality brake pads with more organic pad material such as resin, rubber, fiber, and the like.
What causes drum brake squealing?
When it comes to drum brakes, the most common cause of screeching and squealing is worn out shoes. Other causes can be from improper adjustment or contact with the axel backing plate.
Why do Toyota Tacomas have rear drum brakes?
Why Toyota Decided to Put Rear Drums on Tacoma Models Cost: Drum brakes are cheaper to manufacture than disc brakes, and Toyota passes the savings along to its customers. On the Tacoma (and most unloaded pickups), the front brakes do 70%-80% of the braking. Off-Road Robustness: Drum brakes have an advantage off road.
How long do Tacoma rear drum brakes last?
between 30,000 and 70,000 miles
Do any cars still have drum brakes?
Often seen as a “poverty spec” feature, drum brakes are still prevalent in modern cars of today. A spoon brake on a Penny-Farthing bicycle is ancient. Before we start calling drum brakes ancient, it is important to note that ideas for both drum and disc brake types were conceived in the early 20th century.
Why do trucks have rear drum brakes?
Pick-up trucks still have drum brakes and there are good reasons for it. The main reason why pickups have drum brakes, is due to the fact they are cost effective, require replacement less often, and because they just take less maintenance than their disc brake alternative.
When did cars stop using drum brakes?
This spelled the beginning of the end for drum brakes in passenger cars. From the 1960s to the 1980s, disc brakes gradually replaced drum brakes on the front wheels of cars (which receive the majority of braking force).
Why do Ford still use drum brakes?
Drum brakes are cheaper to manufacture than disc brakes, because there are fewer moving parts and because in the rear the parking brake (which often works by a drum-and-shoe mechanism even on four-wheel-disc-equipped cars) can share a drum with the “regular” brakes.
Why do we use disc brakes in front and drum brakes in rear?
Disc brakes are more powerful and much more effective than drum brakes. This is the reason one cannot find brake fade on disc brakes as much as on drum brakes. Even those vehicles having brakes at both ends will have more powerful discs at the front and lesser ones at the rear.
Which is better drum brake or disc brake?
Even with a small size disc brakes offer quite a large braking power and can stop high-speed vehicles better than a drum brake can. As the disc brakes are open they have really good heat dissipation which ensures they never overheat. With the help of ABS disc brakes don’t lock up during use for high-speed braking.
What is the difference between disc brake and drum brake?
A disc brake has a disc shaped metal rotor spinning within a wheel. When pressure is applied to the brake pedal a caliper will squeeze the brake pads against the disc. Drum brakes are normal brakes whereas disc are for instant braking and locking of the vehicle.
What are the 2 types of drum brakes?
There are three types of drum brakes depending on how the brake shoes are pressed on to the drums; leading/trailing shoe type, twin leading shoe type and duo-servo type.