Technician A says self-adjustment occurs on most duo-servo brakes whenever the foot brake is applied while backing up. $594.88 Add to Cart. SKU 6400083 . Tech B says that duo-servo brake shoe systems typically adjust automatically during normal brake applications in a forward direction. The hydraulically-actuated rear wheel brake is a two-shoe, double-acting, non-servo floating type brake with an adjusting screw for each shoe. In any type of drum brake, adjustment of the distance between the shoes and the drum is crucial. . When applying the brakes in reverse. Dexter View Brake Kit - Left Hand. Complete 12-1/4 x 3-3/8" hydraulic duo-servo manual adjust brake assembly (8K) $754.62 Add to Cart. Anchor Pin When shoes press on the outside of the drum, it is usually called a clasp brake.Where the drum is pinched between two shoes, similar to a . The parts that make up the self-adjusting mechanism are operating correctly. 16 × 16 × 10 in. 12-1/4" x 5" Left Hand Forward Self-Adjusting Duo-Servo Hydraulic Brake Assembly, 12K; Brand. Dexter K23-406-00 AXLE Left Hand Complete 12-1/4X5 Hydraulic Duo-SERVO Forward SELF-Adjust Brake Assembly (15K) Dexter K23-403-00 8K Complete 12-1/4" X 3-3/8 Right-Hand Hydraulic Duo-SERVO Forward SELF-Adjust Brake Assembly. Duo-servo brakes are used in heavier applications and where more aggressive braking is needed. Left Hand. Technician B says on a non-servo brake, the front shoe is called the leading shoe and . The first two types are non-servo brakes. Duo servo type drum brake. The brake is designed for driveline mounted applications typically on the rear axle differential carrier housing. Dexter Hydraulic Drum Brake Kit - Duo Servo - 12-1/4" - Left and Right Hand Assemblies - 10K part number 23-404-405 can be ordered online at etrailer.com or call 800-298-1624 for expert service. DEXTER AXLE Brake HYD Duo-Servo 8K Left 12.25" Hydraulic Dexter Assemb | eBay All Bendix Duo-Servo brake assemblies used in Motor Home chassis applications are self-adjusting. The system is a primary/secondary shoe (not forward/rear) design. . Customer Rating: Ships from and sold by Amazon.com. Duo Servo Servo - applies pressure to something else Servo action - .030" clearance between drum and shoe, force of one shoe pushes on the star wheel adjuster to the other shoe Example: primary shoe - provides some braking but also forces secondary shoe to brake Self energizing - the rotation of the drum improves the friction Forward Self Adjusting / Heavy Duty application. Fig. 4H Revised 4-96 $2.50. The Bosch 305 x 76 mm park brake is a lever actuated, duo-servo, single-anchor drum brake. Additional information. But after that they all had self adjusters here in the US anyway. If the rear brakes are drum brakes, the driver may feel vibrations under braking. Weight. (Perrot U.S. Patent # 1,076,311) with the mechanical version of the "Duo-Servo" brake.) Add to Wishlist. Add to Cart . M-300 Motor Home chassis produced prior to April 1, 1972 are equipped with transmission-mounted parking brakes. In Stock. Hydraulic Brake 12.25″ X 5″ - Right Hand - Duo Servo - Forward Self Adjust - Cast Spider (7 Bolt Mount) 12,000 LB Axles. Inconsistent brake pedal feel. Hydraulic Brake 12.25″ X 3.375″ - Left Hand - Uni Servo - Forward Self Adjust - Cast Spider (4 Bolt Mount). . 12-1/4" x 3-3/8" Left Hand Duo-Servo Hydraulic Brake Assembly, 8K, less mounting hardware. Those definitely aren't self adjusting. Duo-servo drum brake . Trailer Brake Assembly LH Hydraulic Duo-Serve 3500 Lb 10 x 2-1/4" Dexter USA. Out of stock. This item: Dexter K23-403-00 8K Complete 12-1/4" X 3-3/8 Right-Hand Hydraulic Duo-SERVO Forward SELF-Adjust Brake Assembly. Dexter Hydraulic Drum Brake Kit - Duo Servo - 12-1/4" - Left and Right Hand Assemblies - 8K part number 23-402-403 can be ordered online at etrailer.com or call 800-298-1624 for expert service. Right Hand. Bendix brakes were always self-energizing and easy to adjust because both shoes could be adjusted at the same time by their floating shoe at the toe anchors using a the star adjustment gear on an internal threaded sleeve. And in a section about drum-brake self-adjusters, it is said that the incremental self-adjusters are attached to the secondary shoe of a duo-servo brake; The adjustment is made when the vehicle is moving backwards and the brake is applied. FREE Shipping. All duo-servo drum brakes are designed to self-adjust when backing up only under the following conditions: There is a large enough gap between the secondary brake shoe and the brake drum. And in a section about drum-brake self-adjusters, it is said that the incremental self-adjusters are attached to the secondary shoe of a duo-servo brake; The adjustment is made when the vehicle is moving backwards and the brake is applied. Ensure lever operates smoothly. Self-adjusting brakes require little maintenance. When applying the parking brake. The top of the primary shoe is moved outward by hydraulic pressure to contact the drum. Connect brake shoes with adjusting scr ew spring, then position adjusting scr ew. 12-1/4" x 5" Left Hand Forward Self-Adjusting Duo-Servo Hydraulic Brake Assembly, 12K. A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder-shaped part called a brake drum.. Dexter Axle. I was reading about Automotive Brakes (Chapter 52, Automotive Mechanics by William H Crouse, Donald L Anglin, 10th edition). 1497074 Internal shoe-drum brakes; wear adjustment GIRLING Ltd 21 May 1975 [5 June 1974] 24861/74 Heading F2E A duo-servo internal shoe drum brake has an actuator 5 between the actuated ends of shoes 1, 2 and a thrust-transmitting strut assembly 6 between the opposite ends of the shoes 1, 2, the strut assembly 6 being slidably guided in a fixed housing 7 to transmit thrust between the shoes 1 . Tighten . Can you use brake cleaner on drum brakes? Shoe Hold Down Assembly 4. While all drum brakes are "self-energizing", where stopping power is increased by the rotating drum pulling the shoe tighter to the drum, this characteristic is more powerful on duo-servo brakes. 12-1/4" x 5" Left Hand HD FSA Duo-Servo complete hydraulic brake assembly. Fit 16" or larger wheels. It took a good "sense of feel" to adjust the brakes evenly. K23-319-00: Complete 12" x 2" hydraulic 5200# duo-servo with park brake assembly. They look the same as the tapered axle brakes that came on the pre-65 stuff here. OUT OF STOCK . - the auto adjusters work very well & only require initial adjustment - the auto adjusters keep the brake pedal high & the shoes adjusted for minimal travel - all else being equal, disc brakes require about 50% more line pressure than drum brakes because the duo-servo action of the drum brake is a veeeeeeeeeeeery efficient braking mechanism. Adjusting Brakes Before removing the jacks, adjust the brakes. Leading/trailing drum brake design 1) Turn the adjusting screw until the wheel can just be turned by hand *The brake drag should be equal at both wheels 2) Back off the adjusting screw 20 notches *Brakes should have no drag after the adjusting screw is backed off about 10 notches. In a duo-servo drum brake design under normal forward braking, the . Part #K23-210-00. 300 seconds . Tech A. The name of the duo-servo brake is derived from the fact that the self-energizing force is . Nev-R-Adjust™ brakes automatically adjust to proper clearances during travel allowing you to stop with confidence. Each type uses similar drum brake components but functions a bit differently. The store will not work correctly in the case when cookies are disabled. Ships from and sold by Brechbilltrailers. Primary Shoe 7. There are three types of drum brake systems: twin leading shoe, leading/trailing shoe (also called single leading shoe), and duo-servo. Lubricate parking brak e lever fulcrum with suitable brak e lube, then attach le ver to brake shoe. Wheel Cylinder Push Rod 6. Bendix Duo-Servo brakes are used as follows: Front: M300 and M375 models. Tech B says that on a duo-servo brake system, the . Self adjustment and parking brake mechanisms have been removed from above photos for clarity. Leading/trailing brakes are most commonly used on smaller cars. Locate Distributor. Technician B says self-adjustment occurs on a non-servo brake whenever the foot brake is applied when driving forward. Demco 10" Hydraulic Brake Assemblies. By variations in fluid pressure. This brake is rated to a maximum capacity of 7,000 lbs. Report an issue . Click on the title on this page to go to the Maintenance Manual Index. 4. The illustration shows a technician setting a brake shoe adjustment gauge, or caliper, to the inside diameter of a brake drum. . The dual-servo drum brake with leading and trailing shoes requires a wrench to adjust the eccentric adjusting cams located on the backing plate. I was reading about Automotive Brakes (Chapter 52, Automotive Mechanics by William H Crouse, Donald L Anglin, 10th edition). "Duo-Servo" style . DEXTER AXLE Brake HYD Duo-Servo 8K Left 12.25" Hydraulic Dexter Assemb | eBay Tighten the lock nut. Dexter View Brake Kit - Left Hand. Hand brake feels loose. TITAN 12" x 2" BRAKES FREE BACKING. United States Patent 4374554 . $295.24 Add to Cart. The brake adjustment nut is located behind a slot at the bottom of the backing plate. Lowest Prices for the best trailer brakes from Dexter Axle. *The brake drag should be equal at both wheels 3) Back off the adjusting screw 33 notches *Brakes should have no drag after the screw has been backed off about 15 notches S-l -Duo-Servo Brake, 1. Add to Cart . Product Details. Those brakes take a fine touch, the shoes have to have good engagement to the drums. The term drum brake usually means a brake in which shoes press on the inner surface of the drum. per pair. Turn the eccentric ad- justment in the direction the wheel revolves when the car is moving forward until .014 inch feeler is snug. Likewise, the anchor pin is at the top between the two brake shoes. The force which the wheel cylinder applies to the shoes is supplemented by the tendency of the shoes to wrap into the drum during braking. Complete 12" x 2" hydraulic 5200# duo-servo with park brake assembly. 2-024 32 ST U DEN T BOOK UNIT TWO DISC AND DRUM BRAKE SYSTEM OPERATION Duo-Servo Incremental Self-Adjuster On duo-servo brakes a similar type of self-adjusting mechanism is used. Rear: M300, RM300 and RM350 models. . Who is correct? Dexter View Brake Kit - Right Hand. New . (Fig. All duo-servo drum brakes are designed to self-adjust when backing up only under the following conditions: There is a large enough gap between the secondary brake shoe and the brake drum. Secondary Shoe Return Spring 12. 2. There are two common brake shoe configurations, non-servo, or leading-trailing design, and duo-servo brakes. brakes' force multiplying servo action. SKU. The other side of the gauge is then positioned over the brake shoes and the star wheel turned until the shoes tightly contact each end of the gauge. Locate Distributor. axles and gives you the right amount of braking for your needs. Duo-Servo Drum Brakes: 1) Turn adjusting screw until the wheel can just be turned by hand. Flange Plate 8. *Brakes should have no drag after the adjusting screw is backed off about 10 notches. K23 . The primary is the front shoe in all wheels. Available as free backing brakes, uni-servo brakes and duo-servo brakes, the Demco 10" hydraulic trailer brake assembly is rated for 3,500 lbs. Primary Shoe Return Spring 5. . Duo-servo drum brake systems use an adjusting screw assembly and spring to connect the lower end of the shoes. When applying the brakes in forward. The duo servo type features a structure where two brake shoes, called the primary shoe and secondary shoe, are linked via an adjuster.Strong pressure from the servo effect (self-boosting effect) of the primary shoe is transmitted to the linked secondary shoe, thus generated a very large braking force. Boxed Complete Backing Plate Kit with Mounting Hardware. Who is correct. All three types are self-energizing in at least one direction. The shoes are linked to each other at the bottom, but are not attached to the backing plate like the Lockheed design. Like the leading-trailing design, the duo-servo has a two-piece adjuster assembly with a star wheel screw to increase and decrease its length. Hydraulic Brakes Mechanical Brakes • DLH • DCM • DSH • DLM • DH • DM • FSH • H Hydraulic and Mechanical Drum Brakes Maintenance Manual No. Hydraulic Brake 12.25″ X 5″ - Right Hand - Duo Servo - Forward Self Adjust - Cast Spider (7 Bolt Mount) 12,000 . Additional information Description. . Rear: M300, RM300 and RM350 models. Technician a says on a duo-servo brake the front shoe is called the primary shoe and the rear shoe is the secondary shoe. Adjusting Screw Nut 14. The parts that make up the self-adjusting mechanism are operating correctly. K23-324-00: Complete 12" x 2" hydraulic 5200# uni-servo brake assembly.
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