Car And Truck Brake Parts

Drum Brakes

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Drum Brakes
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Mountain bikes are designed for off-road riding. Whether made for racing or the more leisurely rider, there are four basic frame designs for mountain bikes: rigid, hard-tail, soft-tail, and full suspension.

The rigid (also commonly known as fully rigid) mountain bikes resemble a conventional sort of bike as you would imagine it. A rigid mountain bike has neither a rear suspension nor a front suspension. These used to be the most common kind of mountain bike but they are rapidly being replaced by the more comfortable models which feature some sort of suspension system. Fully rigid bikes tend to be lower-priced than models with a suspension. Many riders still prefer rigid bikes because it's what they're accustomed to, and the feel that the rigid design allows them greater control.

Another common mountain bike design is the hard-tail. Hard-tail mountain bikes are so named because they have a conventional rear end without a suspension. Hard-tails differ from fully rigid bikes in that they have a front suspension. The hard-tail is perhaps the most popular mountain bike design. Many professional riders prefer the feel of a hard-tail and the comfort of a front suspension.

The next kind of mountain bike design is the soft-tail. As you probably guessed, soft-tails employ a rear suspension. Rear suspensions are a more recent innovation than front suspension due to the complexities of the design. Soft-tails are often more expensive than hard-tails, but they also tend to be more forgiving.

Finally there's the full suspension mountain bike. Bikes with this design feature both front and rear suspensions. These bikes are the latest mountain bike design. For a long time riders avoided full suspension bikes because they were heavy and they tended to sag in the middle like an old swayback horse. It took years for engineers and riders to perfect a viable, functional full suspension mountain bike. It was in the 1990's when these bikes finally reached a point where they were marketable.

In addition to the frame and suspension, there are other differences in mountain bike designs. One key area where bikes differ is the brakes. Mountain bikes either have some form of caliper brakes, which are the kind of brakes typically associated with bikes. This kind of brake squeezes the rims to slow and stop the bike. The other type of brake is the drum brake. Drum brakes on bikes are similar to the braking system on automobiles. Drum brakes are more expensive than caliper brakes but they're also easier to maintain. Mountain bike braking systems have even been made which utilize hydraulic power.

Another area where you have some choice in mountain bike design is tire size. Mountain bike tires typically range in size from 24" to 29". Smaller tires are used when greater maneuverability is required as in stunt-riding and jumping. Larger tires are used when speed is the key.

As with any other important purchase, do your homework before buying a new mountain bike. Think about your needs and your budget. Mountain biking is a terrific past-time. It's a fun way to get some fresh air, enjoy the outdoors, and improve your health.

Gregg Hall is an author living in Navarre Beach, Florida. Find more about this as well as cycling fitness at http://www.cyclinggearplus.com

The Damage Caused By Driving With Your Parking Brake On

Okay, let's start off by being honest. At one time or another, our inner idiot has come out and we've all gone for a drive with the parking brake on. We usually recognize the problem when our noses start sending warnings to the brain or we realize the car sure is slow! So, what damage does this cause?

I was driving to a softball game with a buddy in his rebuilt MG. We had the top down and he was gloating about his little baby. I kept thinking that the car didn't seem very peppy and then I noticed smoke coming up through the floor between the seats. He pulled over in a huff and jumped out of the car. I had a pretty good idea of what had happened and was laughing as he looked at the front wheels while screaming about his brakes. Why laugh? The parking brakes are on the back of the car!

Driving with your parking brakes on is obviously not a good thing to do. That being said, the damage caused is either next to none or totally catastrophic. How can there be no middle ground? Well, the answer is found in how parking brakes work. On most cars, they are set by the amount of effort you put on pulling the brake up. If you gave it a solid tug, you are going to notice immediately when you try to drive because the car will barely move.

Most of the "driving with the brake on" situations occur when the parking brake is slightly engaged. It is on, but isn't on tight enough for you to notice when driving. In such a situation, the drum or rotor isn't going to be damaged unless you are unlucky. It might cause a bit of additional wear, but nothing too bad. There is, however, one exception to this and raises the specter of a bigger problem. If you drive a long ways like this, the rotor or drum could be damaged to the point that they require replacement. The issue isn't the wear rate, but the heat that builds up. As the parts get hotter, they will warp. This is particularly true for drum brakes.

Driving with your brake on is something everyone has done at one point or another. I certainly have! Usually, it is just embarrassing and nothing more than that. If you are worried or it feels like something is wrong, get your car checked out. Be honest and tell them what happened!

About the Author

Dirk Gibson writes brake articles for DCJAutoParts.com - your resource for high performance auto parts and aftermarket car parts online.

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New Meritor Trailer Suspension Series Brings Performance Benefits to North American Truck-Trailer Operators
ArvinMeritor, Inc. today unveiled an all-new series of durable, trailing-arm air ride trailer suspensions to meet  the needs of North American truck-trailer operators in vocational markets â including platform, tank, grain, dump, chassis, bulk, specialty, lowboy, livestock and specialty vans. Â

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