Drum brakes are commonly used on rear wheels.
Vehivle brake clatter by itself is seldom a draggy puzzle; but, it can sometimes instruct that a all the more extended businesslike subject is developing. It is besides one of the most irritating and embarrassing problems from the perspective of the Chauffeur and passengers. Drum brakes, which are used on the rear wheels of many cars, can compose a disparate compass of noises than CD brakes, and learning superscription these noises can build for augmented peaceable motoring while avoiding extra cold sober problems down the plan.
Instructions
Noise Diagnosis
1. Halt provided the brake bedlam is fixed or single audible when the brakes are applied. Button down provided the clatter has always been there or has slowly developed over duration. Look for any foreign material embedded in the surface of the lining. Inspect for damage or scoring of the lining material. Measure the thickness of the shoe linings; if they are thinner than the manufacturer's recommendations, then they should be replaced.
Provided the squeal does not birr gone during this room, it is viable that the enigma lies in the brake shoe linings. Some shoes are imaginary with solid lining counsel, and brake squeal is acknowledged when this is used. In this context, a pin money to a softer lining data may compose the din birr outside.2. Wait for the inexperienced shoes to wear in. It Testament booty approximately 300 to 400 miles of municipality driving before the advanced shoes wear in with the drum, so a tolerable proportions of bellow, during this extension, is not unforeseen.
3. Gaze the brake linings to gawk whether they are worn outside or damaged. Whether the lining is completely worn or has failed, then the metal backing on the shoe Testament contact the drum during braking, and a crashing grinding or scraping blast Testament decision.
4. Trial that the drum is not out-of-round and that all brake parts are secured in their Correct positions. Provided the drum is not round, then the brakes Testament vibrate, and a quick throbbing sound Testament be heard. Provided the sound is aggrandized passion a sharp, brisk chattering, then something in the brake meeting is doable loose. Scrutinize the brakes straightaway.
5. See the parking brake. Whether there is a continual faint squeaking or squealing while the automobile is Stirring and the sound disappears when the brakes are applied, then it is practicable that the parking brake is stuck in a partially applied position. Proof for Correct manner of the parking brake application or pedal and be firm that it is releasing properly. Trial the cable at both the handle or pedal end in the passenger compartment and at the brake end and look for signs of rust or corrosion.
Basic Drum Brake Inspection and Cleaning
6. Loosen the lug nuts on both rear wheels with a lug nut wrench. Raise the rear of the automobile with a jack and support it on axle stands at the designated support points. Remove the rear wheels. It is possible to work on one wheel at a time, but it is useful to compare the brake assemblies of two wheels, especially if one side is making noise but not the other.
7. Remove the nuts that hold the brake drum to the hub and pull the drum straight off the hub assembly. If corrosion and rust have seized the drum onto the hub assembly, it can be loosened by firmly tapping the drum on the outside shoulder with a hammer or mallet. Do not hit the drum on the inside edge where the drum meets the backing plate and do not pry the drum against the backing plate. With the drum removed, the brake assembly is now visible.
8. Inspect the brake components carefully. Start with the drum. Check the inside surface for scoring, deep grooves and other signs of abnormal wear. Look for excessive rust, corrosion or discoloration of the metal. If the inside of the drum shows any abnormal signs, then the drum should be machined. If there are any cracks or spots that are glazed or deeply pitted, then the drum should be replaced. Measure the inside drum diameter in several locations using the brake micrometer. All diameter measurements should be the same. If they are not, then the drum is out-of-round and should be machined. Compare the measured drum diameter to the manufacturer's specifications; and if the measured diameter exceeds the specified maximum diameter, the drum is worn out and should be replaced.
9. Check the brake shoes. Chew over whether the boom started suddenly and, whether so, if it was after a brake service. Dispose the type of babel, such as squealing, grinding or very. Envisage approximately any other symptoms that accompany the babble, such as vibration, reduced braking performance or brake grabbing. Cause a string of everything you comprehend approximately the disagreement to facilitate in the diagnosis. Check the steel shoe for signs of damage or bending. Damaged shoes should be replaced.
10. Inspect the backing plate. Check for excess corrosion, especially at the points where the shoes touch the backing plate. Look for any sign that the backing plate may be bent or distorted.
11. Check all brake components to ensure they are securely and properly fastened and that they are clean and free from excessive corrosion. Check the brake on one side of the car against the brake on the other side. Look for any heavy buildup of dust and dirt anywhere in the brake assembly since this is the major cause of drum brake noise. Be sure the springs are in good shape and properly fastened at both ends. Verify that the clips or pins that hold the brake shoes are in good shape and properly fastened at both ends. Look for heavy dirt buildup or corrosion on the adjuster star wheel.
12. Clean the entire brake assembly with brake cleaning fluid spray. Spray all parts liberally and wipe away any dirt and corrosion with a rag. Place a drip pan under the brake assembly to catch the used fluid and dispose of it in accordance with local regulations. Use a rag or small wire brush to loosen stubborn dirt and corrosion. Clean the inside of the drum in the same manner.
13. Lubricate the various contact points with high-temperature brake grease. Lubricate the points where the brake shoes contact the backing plate. Apply grease to the shoe hold-down pins and the adjuster lever pivot point. Lubricate the threads on the adjuster star wheel. Take care not to get any grease on the lining surfaces of the brake shoes or on the inside of the drum.
14. Reinstall the drums. Remount the wheels and lower the vehicle. Test the brakes.
