Bendix Three Shoe Brakes
In the Bendix lever control, the brake cam is actuated by a control lever attached to the axle of the vehicle. One end of this control lever is ball shaped and bears against a small lever attached to the camshaft, as shown in Fig. N7. The other end of the control is operated by the brake pull rod. This provides a very simple means of actuating the front brakes without interfering with the movement of the wheels in steering. When the wheels are turned, the flat end of the small lever slides over the ball and the relationship between the two remains approximately the same.
As adjusted at the factory, the center of the ball is about ¼ to 5/16 in. behind the center of the steering king pin, when the brakes are released. As the brake lining wears, the center of the ball moves slightly forward.. Any serious variation from these dimensions will cause the brake to be applied when the car turns a corner. With the ball ends in the correct position the outer brake is released when the car is turning a corner.
Minor Adjustment for Clearance Minor or lining clearance adjustment is made as follows:
Anchor pins should be adjusted -
To adjust anchors: Turn eccentric adjustment (See fig. N7) away from articulating pin and leave loose. Slacken off on anchor pin nuts (Fig. N11), then tap both anchors out toward edge of drum, as in Fig. N11. Hold brake on tight by 100-pound load on the end of a 10-in. length monkey wrench applied to control lever. Tap anchor pins on end and try to turn wheel forward with brake applied. Still holding brake on, tighten both nuts as tight as possible with a 16-in. wrench. Release brake and readjust clearances as outlined in paragraphs 1 to 7 inclusive.
8x. Drums, with inspection ports permit a far more satisfactory adjustment as follows:
Adjustment of Single Anchor Pins on 1-inch Bendix Brake
On the cam and plate type. eleven-inch diameter brake there is only one adjustable anchor pin. This is the secondary anchor pin-the auxiliary pin stopping short of the backing plate and not being attached thereto. In this case the auxiliary pin forms an articulating joint between the secondary and auxiliary shoes. Shoe anchor pin construction of the eleven-inch brake is shown in Figs. N7 and N13.
To adjust the secondary anchor pin on this type of assembly, proceed as follows:
If Bendix brakes do not give satisfactory performance after making these adjustments, check carrier brackets and operating cams, as outlined below.
Adjustment of Operating Cams and Their Carrier Brackets
Adjustment of the brake operating cams and their carrier brackets should be made whenever the shoe assemblies are removed and also on all major adjustments. The carrier bracket may be considered in correct adjustment when it is bolted to the backing plate tightly enough to resist movement by hand but loose enough to be readily moved when tapped with a hammer. Examine and make sure that the plain washer is not bent. Make sure that the lock washer is not broken.
On some models a special cam shaped stop is fitted to control the position of the earner bracket. This construction is shown in Fig. N14. To adjust this type proceed as follows:
- Turn each stop away from bracket.
- Drive car a short distance and apply brakes violently.
- Turn stops until they touch bracket, back off slightly and tighten. This should give about 1/32 inch clearance between stop and bracket. The carrier bracket nuts on this type of construction should have the same tightness as those without the stop.
Erskine to 1930
Studebaker Dictator (some)
Studebaker President 8 (some)
Oldsmobile 6 prior to F30
Pierce-Arrow (8 Cyl)
Hupmobile 6 (1926-1927)
Marmon 68 78
Essex to 1929
Studebaker Commander (some)
Star 4 and 6