AUTONET TV BLOG

For Brakes' Sake (Brake Rotor Service in TUCSON)

Think of how much abuse your brakes take. Day in and day out, they stop your vehicle when it's going fast and when it's going slow. Maybe your vehicle has been vibrating when you brake, or maybe it seems like your stopping distance is a little bit longer than it used to be.

Then it's time to get your brakes checked out. After all, you have to be able to stop if you want to be safe. Nearly all newer vehicles have disc brakes on the front, and many have that type of brake on all four wheels. That makes it likely you'll be getting disc brakes fixed at some time in your vehicle's lifetime.

Knowing how disc brakes work is as easy as riding a bicycle. If your bike had hand brakes, you'll probably remember a mechanism that squeezed a couple of pads on each side of your bicycle wheel when you applied the brakes. Disc brakes are similar; but instead of the bike wheel, there's a metal disc instead. If that disc is warped or has irregularities in it, it's going to vibrate.

It used to be that rotors were thick, and when they warped, a technician could "turn" them to scrape off a layer of metal so their sides were straight again. The latest vehicles are using thinner, lighter rotors with a slightly different construction. Now, it's likely that rotors that are resurfaced this way will not have enough metal left to work safely. In fact, some manufacturers advise only replacing rotors that are worn out.

Newer designs have reduced rotor prices, and in many cases, the labor cost of turning the rotors is higher than buying new. There are times, though, where your rotors can be resurfaced and still meet manufacturer specifications.

If you have a rotor replaced on one side of your vehicle, it might be a good idea to replace rotors on the other side, too.

Maybe you're looking for the new rotors to last longer than the ones that were on there. New technologies can offer a longer lifespan in a premium rotor. Armed with knowing the type of driving you do, you and your Garrigan's Auto Repair Shop service advisor can make the best decision on which direction you want to go with your new brakes.

Garrigan's Auto Repair Shop
6465 E GOLF LINKS RD
TUCSON, AZ 85730
(520) 572-7505
http://garrigansautorepair.com

Read a Good Tire Lately? (Tire Wear)

There's lots of good information to read in books and online.  You might not know that you can also "read" your tires and learn a lot about what shape they're in and if they are in need of attention. It's important to know how your tires are doing because a tire failure can be very dangerous to you, your passengers and others on the road near you.

You read your tire by looking at the surface that rides on the road, where the tread is.  Check out the outer and inner edges.  If you notice there's more wear on the inner or outer edge than on the rest of the tread, your vehicle could be out of alignment.  Wear on an inner or outer edge could mean your wheels are leaning too much to one side.  When you see this, visit our service center soon to have the alignment checked.

What about if both edges are worn? That could be a sign that you don't have enough air in that tire.  In an underinflated tire, the middle is not contacting the road surface as much as the edges, so the edges wear down first.  It could also mean that you're taking corners too aggressively or your tires haven't been rotated on a regular schedule.

Another thing you might see on your tires' tread area is wear in the center of the tire.  That means you likely have too much air in that tire.  Too much air makes your tire contact the road in the middle more than on the edges so the middle wears down prematurely. 

You might also see some smooth spots on the tread in irregular spots. This is called cupping. This is sometimes caused by suspension problems. A technician can examine your suspension to see if it is up to the manufacturer's specifications.

Finally, you may spot tires that are worn unevenly in a pattern that goes diagonal to the tread pattern.  This could mean your tires are out of balance, something our service center can check. They might also check alignment at the same time.

Your tires are the only part of your vehicle that contacts the road surface.  That means your acceleration, traction, steering and braking are all dependent on your tires being healthy. Maintain your tires by having one of our trained technicians read the clues and making sure they're always in roadworthy shape. 

Garrigan's Auto Repair Shop
6465 E GOLF LINKS RD
TUCSON, AZ 85730
(520) 572-7505
http://garrigansautorepair.com

Not Too Hot and Not Too Cold (Temperature Gauge)

You know your body temperature is supposed to be 98.6 degrees F, 37 degrees C.  Your vehicle has a normal temperature, too, and if you pay attention to it, that can save you some big headaches down the road.

Many vehicles have a temperature gauge on the dash that takes the temperature of the engine's coolant.  Some have a thermometer symbol, some read C-H (cold to hot). Many will have a red zone that shows when water temperature is getting into the danger zone.  Others are digital and have a red warning light that signals overheating.  And some vehicles have a light that goes on when the engine temperature is out of the normal range.

If your vehicle has a gauge, pay attention to it.  If you need help locating it, ask one of our Garrigan's Auto Repair Shop experts to give you a quick explanation.  Chances are when the vehicle has been running for 15 minutes or more, the temperature gauge will settle into its own "normal" zone, often just below the midway point.  If you have a digital readout, remember what that "normal" temperature is.  Here's why.

At any point when you're driving, the temperature gauge is the quickest way to get a sense that the engine is running the way it should, a quick health checkup, as it were. Say you're on a 3-hour trip, glance at that gauge every hour or so.  It should always be in the same spot.  If it starts to move one way or the other, you may be able to catch a problem before it gets serious.

Pay special attention to it moving into the hot zone.  The needle on the gauge is the easiest and least distracting way to see an engine heating up, but on a digital gauge, start paying attention if the temperature reaches 240ºF/115ºC or more.

Remember, though, that just because the gauge reads "hot" doesn't mean your engine is on the verge of burning up.  It could be a bad sensor and the engine will be at a normal temperature.  But it also could be a failing water pump, coolant leak or thermostat.  By pulling off the road and observing your engine, it will give you a pretty good idea if it's running hot or not.

If the gauge is too "cold," it could be a broken gauge or thermostat sticking open.  Usually being in the cold range isn't as worrisome, but you should have it checked out since other systems may be affected.

Heat is one of a vehicle's worst enemies, especially when it comes from within.  Know your vehicle's normal temperature and keep an eye on it.

Garrigan's Auto Repair Shop
6465 E GOLF LINKS RD
TUCSON, AZ 85730
(520) 572-7505
http://garrigansautorepair.com

Regular Schedule or Severe Service Schedule at Garrigan's Auto Repair Shop?

Today's Garrigan's Auto Repair Shop article focuses on severe service maintenance. Many TUCSON drivers are not aware of them and yet there are also very vocal advocates in AZ who think that severe service schedules apply to everyone. Somewhere between a complete lack of awareness and the dire blanket statements lies a reasonable approach to severe service maintenance at Garrigan's Auto Repair Shop.

To back up a little, vehicle owner's manuals have schedules for preventive maintenance: things like oil changes, transmission service and so on. They say you should change your oil after a certain distanced traveled or after so many months. TUCSON drivers understand this very well. What they may not know is that there are actually two service schedules: the regular schedule and the severe service schedule. The mileage and time intervals are lower on the severe service schedule.

Now when you hear 'severe service,' you may think it doesn't apply to you because you don't feel your driving conditions are severe or extreme – it's just normal everyday driving in the TUCSON area. So let's list some of the conditions that classify as severe so that you can make the judgment on your own driving.

Before we start the list, here's a point of contrast that definitely is not severe driving. Driving down your nearest AZ interstate at the highway speed limit on a 75 degree F/24 degree C day loaded only with your passengers. This is an easy trip for your vehicle: your engine is loafing along at low RPMs, no heavy loads to pull and moderate TUCSON temperatures. Now let's look at some severe service driving conditions.

Most trips around TUCSON are less than four miles/six and a half kilometers. When your vehicle engine cools down, moisture condenses in the engine. This water in the oil doesn't get a chance to evaporate on short trips because the oil doesn't get hot enough. A lot of short trips in your vehicle means a lot of water build up. And water in the oil leads to the creation of sludge which can damage the engine. Changing the oil more frequently keeps sludge from building up. By contrast, highway driving warms the engine up and gets the water burned off.

Here's another example. Most trips around TUCSON are less than 10 miles/16 km and outside temperatures are below freezing. This is the same reasoning, but in very cold AZ weather it takes even longer for the oil to get hot enough to evaporate the water, hence 10  miles/16 km as opposed to 4 miles/6.4 km.

Next, you drive in very hot AZ weather. The hotter it is outside, the more cooling the engine, transmission, brake fluid and so on becomes. The environment in which the fluids reside is more hostile, and the fluids simply break down faster. Therefore, the lower change interval.

Another: driving at low speed most of the time. Every vehicle engine has what's called its power band. This is a range of RPMs in which it's most efficient. Low speed driving doesn't keep the engine in its power band so it's working harder. This is one of the reasons that ratings are worse in downtown than on the highway.

Stop and go driving in TUCSON is another severe service condition. You're always accelerating, which works the vehicle engine and transmission harder. Then you're stopping, which works the brake fluid harder, causing it to get very hot. Highway driving, on the other hand, requires far less horsepower to maintain its speed than getting a stationary vehicle from a stop light up to 25 mph/40 kph. A lot of this and you'll need to follow the severe service schedule.

Also on the list is operating your vehicle in dusty, polluted or muddy conditions. Obviously, your engine air filter and cabin air will get dirty faster and need to be changed more frequently as will your breather element. Some of this dust and dirt will make its way into your fluids. They will simple get dirty faster and won't protect the components as well as fresh fluids.

Finally, you're driving under severe conditions in TUCSON when you tow a trailer, regularly carry heavy loads or carry a car-top carrier. This is pretty obvious. You'll spend more time in lower gears so the engine and transmission work much harder and create more heat. Brakes will be more stressed stopping the heavier loads.

Sounds like most of us in TUCSON operate under severe driving conditions at least some of the time. How can TUCSON drivers know which schedule to follow?

Think of it as a spectrum with "always driving under severe conditions" on one end and "never driving under severe conditions" on the other end. Some will be at one extreme or the other, but most of us will fall somewhere in between.

Carefully think about your driving conditions and decide if you should do your preventive maintenance closer to the severe service recommendation or the regular recommendation. Of course, your Garrigan's Auto Repair Shop service advisor can help you with your decision.

Garrigan's Auto Repair Shop
6465 E GOLF LINKS RD
TUCSON, AZ 85730
(520) 572-7505
http://garrigansautorepair.com