Brakes
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(→Drum brakes) |
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==Drum brakes== | ==Drum brakes== | ||
| − | [[ | + | [[File:Brake leading trailing and duo servo.jpg|frame|none|Leading/trailing shoe drum brake left; duo-servo type on right]] |
| − | When replacing drum brake shoes, you | + | ===Dou-servo drum brakes=== |
| + | When replacing drum brake shoes, if you have one shoe with less friction material than the other, the shoe with '''''less''''' material covering the steel shoe | ||
| + | goes towards the '''front''' of the vehicle. This is commonly found on duo-servo type drum brakes. Because of how the brakes work in a duo-servo, the rear shoe sees more wear than the front. On the diagram above this can be seen. On the duo-servo drum brake, the front shoe is called the "primary" shoe, the rear shoe is the "secondary" shoe. | ||
| + | |||
| + | ===Leading/trailing shoe drum brakes=== | ||
| + | These are seen in lighter duty applications such as the rear brakes of a front wheel drive vehicle. On them, the bottom of the shoes are solidly held against a pivot point, and only the tops of the shoes expand out to contact the drum. This design has less braking ability than a duo-servo type brake because only the front shoe has a self-energizing effect. In this setup, the front (leading) shoe is often the same as the rear (trailing) shoe as far as the amount of friction material covering the steel backing shoe, but the material may be thicker on the front (self-energizing) shoe. | ||
| + | |||
| + | ===Other drum brakes=== | ||
| + | *Two-leading-shoe drum brakes were used on motorcycles before disc brakes became popular. Also seen on large trucks. | ||
| + | *Single-servo type brakes are used on trailers, etc. On them the brake cylinder plunger extends only from one side, bearing on the leading shoe. | ||
| + | |||
| + | ===Self adjusters=== | ||
| + | On vehicles having self adjusting brakes, the self adjuster mechanism (link or cable depending on the type) goes towards the ''rear'' of the vehicle. | ||
==Brake system== | ==Brake system== | ||
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