The illustration shows a technician setting a brake shoe adjustment gauge, or caliper, to the inside diameter of a brake drum. . Adjusting Screw 2. 12" x 2" NEV-R-ADJUST Left Hand Electric Brake Assembly Kit, 7K less mounting hardware . Primary Shoe Return Spring 5. 16 × 16 × 10 in. Ships from and sold by Brechbilltrailers. The term drum brake usually means a brake in which shoes press on the inner surface of the drum. Bendix Duo-Servo brakes are used as follows: Front: M300 and M375 models. 12-1/4" x 3-3/8" Left Hand Duo-Servo Hydraulic Brake Assembly, 8K, less mounting hardware. $247.62. Ans - The term duo-servo drum brake is derived from the fact that the self-energizing force is transferred from one shoe to the other with the wheel rotating in either direction. Left Hand. Self adjustment and parking brake mechanisms have been removed from above photos for clarity. Adjustments were made by manually turning the notched wheel on the adjuster with a brake spoon for the self-energizing type. Complete 12-1/4 x 3-3/8" hydraulic duo-servo manual adjust brake assembly (9K - 10K general duty). Turn the eccentric ad- justment in the direction the wheel revolves when the car is moving forward until .014 inch feeler is snug. By variations in fluid pressure. Hydraulic Brake 12.25″ X 3.375″ - Left Hand - Uni Servo - Forward Self Adjust - Cast Spider (4 Bolt Mount). New . Once the drum brake . Primary Shoe 7. Add to Wish List. When applying the brakes in reverse. Hydraulic Brake 12.25″ X 3.375″ - Left Hand - Uni Servo - Forward Self Adjust - Cast Spider (4 Bolt Mount). There are two common brake shoe configurations, non-servo, or leading-trailing design, and duo-servo brakes. 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. Qty: . Duo-servo brakes are used in heavier applications and where more aggressive braking is needed. Add to Cart . Fig. . . *Brakes should have no drag after the adjusting screw is backed off about 10 notches. Self-adjusting brakes require little maintenance. Dexter K23-409-00. 12-1/4" x 5" Left Hand HD FSA Duo-Servo complete hydraulic brake assembly. TITAN 12" x 2" BRAKES FREE BACKING. M-300 Motor Home chassis produced prior to April 1, 1972 are equipped with transmission-mounted parking brakes. The Bosch 305 x 76 mm park brake is a lever actuated, duo-servo, single-anchor drum brake. Right Hand. The design gives balanced braking in light applications. Who is correct. Dexter K23-404-00. They look the same as the tapered axle brakes that came on the pre-65 stuff here. I was reading about Automotive Brakes (Chapter 52, Automotive Mechanics by William H Crouse, Donald L Anglin, 10th edition). Blue-Collar Cash: Love Your Work, Secure Your Future, and Find Happiness for Life Ken Rusk Incorporating a "fall-away" shoe that reduces shoe drag when in reverse, our free backing brakes are . brakes' force multiplying servo action. The hydraulically-actuated rear wheel brake is a two-shoe, double-acting, non-servo floating type brake with an adjusting screw for each shoe. $119.50. Nev-R-Adjust™ brakes automatically adjust to proper clearances during travel allowing you to stop with confidence. Technician A says self-adjustment occurs on most duo-servo brakes whenever the foot brake is applied while backing up. SKU 6400083 . 3 .008 inch feeler gauge.) All Bendix Duo-Servo brake assemblies used in Motor Home chassis applications are self-adjusting. as duo servo) brakes. Complete 10 x 2-1/4" hydraulic duo-servo brake assembly. Adjusting Screw Socket 3. Dexter 8K Hydraulic Duo-Servo Self-Adjust Brake Assembly 12-1/4″ X 3-3/8″, Left-Hand, (K23-402-00) Fits Dexter 8,000 lb. Leading Trailing brakes are adjusted: Those definitely aren't self adjusting. "Duo-Servo" style . Axles With Hydraulic Drum Brakes 12-1/4″ x 3-3/8″ 4-Bolt Mount Forward Self-Adjusting Left-hand (Drivers side) Additional information. Tighten the lock nut. OUT OF STOCK . Leading/trailing drum brake design S-l -Duo-Servo Brake, 1. The primary is the front shoe in all wheels. Locate Distributor. Only 4 left in stock - order soon. Technician B says self-adjustment occurs on a non-servo brake whenever the foot brake is applied when driving forward. Complete 12" x 2" hydraulic 5200# duo-servo with park brake assembly. Product Details. 12-1/4" x 5" Left Hand Forward Self-Adjusting Duo-Servo Hydraulic Brake Assembly, 12K. This brake is rated to a maximum capacity of 7,000 lbs. The first two types are non-servo brakes. 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 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. Add to Wishlist. Lowest Prices for the best trailer brakes from Dexter Axle. Duo-Servo Drum Brakes: 1) Turn adjusting screw until the wheel can just be turned by hand. Friction linings wear during use. Complete 12-1/4 x 3-3/8" hydraulic duo-servo manual adjust brake assembly (8K) $754.62 Add to Cart. SKU. FREE Shipping. The term duo-servo means that the force-multiplying servo action of the brakes occurs when the vehicle is moving forward or in reverse. Fit 16" or larger wheels. Hydraulic Brake 12.25″ X 5″ - Right Hand - Duo Servo - Forward Self Adjust - Cast Spider (7 Bolt Mount) 12,000 LB Axles. The store will not work correctly in the case when cookies are disabled. An automatic one-shot adjusting apparatus which is applicable both for mechanically and for hydraulically actuatable duo-servo drum, brakes and which includes two ratchets (6, 14) interacting. All Bendix Duo-Servo brake assemblies used in Motor Home chassis applications are self-adjusting. Secondary Shoe 10. . But after that they all had self adjusters here in the US anyway. There are three types of drum brake systems: twin leading shoe, leading/trailing shoe (also called single leading shoe), and duo-servo. United States Patent 4374554 . Duo-Servo Drum Brakes: 1) Turn adjusting screw until the wheel can just be turned by hand. 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. Technician B says on a non-servo brake, the front shoe is called the leading shoe and . DEXTER AXLE Brake HYD Duo-Servo 8K Left 12.25" Hydraulic Dexter Assemb | eBay Adjusting Screw Nut 14. 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. Hand brake feels loose. Scraping noise while braking. Tighten . Connect brake shoes with adjusting scr ew spring, then position adjusting scr ew. Inconsistent brake pedal feel. The name of the duo-servo brake is derived from the fact that the self-energizing force is . Not sure what they did on the Brazilian stuff. Duo-servo drum brake systems use an adjusting screw assembly and spring to connect the lower end of the shoes. When applying the parking brake. $8.51. A only Technician A says the anchor pin acts as a brake shoe stop. 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. Locate Distributor. . Those brakes take a fine touch, the shoes have to have good engagement to the drums. 8,000-Lbs Per Pair Capacity Rated. Secondary Shoe Return Spring 12. In Stock. Customer Rating: Tags: Question 11 . Who is correct? On the Twinplex wheel brake assembly, the shoes anchor at either toe or . Shoe Guide Plate 9. Ships from and sold by Amazon.com. 4. The system is a primary/secondary shoe (not forward/rear) design. Dexter View Brake Kit - Right Hand. 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. Fig. An automatic adjusting mechanism (106) cooperates with the strut to maintain a substantially constant running clearance between the . 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. Forward Self-Adjusting Brake (FSA) Yes : Finish: Paint : Country of Origin: USA : Caliper / Cylinder SKU: 6450028 : Reviews . 300 seconds . 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. The brake is designed for driveline mounted applications typically on the rear axle differential carrier housing. If the hand brake requires a hard yank to keep the car from rolling off, chances are the brake shoes need replacing. . Product Details. Adjusting Brakes Before removing the jacks, adjust the brakes. Tech B says that on a duo-servo brake system, the . True 30 True or false . 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. 12-1/4" x 5" Left Hand Forward Self-Adjusting Duo-Servo Hydraulic Brake Assembly, 12K; Brand. SURVEY . 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. . The brake adjustment nut is located behind a slot at the bottom of the backing plate. 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. $295.24 Add to Cart. Hydraulic Brake 12.25″ X 5″ - Right Hand - Duo Servo - Forward Self Adjust - Cast Spider (7 Bolt Mount) 12,000 . 20 lbs. Bendix Duo-Servo brakes are used as follows: Front: M300 and M375 models. Dexter Axle. 2. 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. UNI-SERVO . 1). Leading/trailing brakes are most commonly used on smaller cars. $409.82. *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 DUO-SERVO PREMIER, MARINE, & STANDARD Limited Warranty TITAN Inc. ("TITAN') warrants its products to be free from defects in material and . Duo servo type drum brake. K23 . . Adjusting Screw Spring 13. Wheel Cylinder 11. Demco 10" Hydraulic Brake Assemblies. axles and gives you the right amount of braking for your needs. Its self-adjusting feature enables the brake to maintain a consistent functional clearance between the brake shoes (Fig. Tech B says that duo-servo brake shoe systems typically adjust automatically during normal brake applications in a forward direction. It took a good "sense of feel" to adjust the brakes evenly. Forward Self Adjusting / Heavy Duty application. If the rear brakes are drum brakes, the driver may feel vibrations under braking. Tech A says that when inspecting brake shoes, if the shoes are unequally worn, this could be caused by a stuck wheel cylinder piston. 1-5. 4H Revised 4-96 $2.50. Add to Cart . (Perrot U.S. Patent # 1,076,311) with the mechanical version of the "Duo-Servo" brake.) Duo-Servo brakes adjust: answer choices . Wheel Cylinder Push Rod 6. Rear: M300, RM300 and RM350 models. Lowest Prices for the best trailer brakes from Dexter Axle. 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. Trailer Brake Assembly LH Hydraulic Duo-Serve 3500 Lb 10 x 2-1/4" Dexter USA.