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Once you pass the driving test, DMV will issue you a temporary DL until you receive your new DL in the mail. The temporary DL is valid for 60 days. You will receive your DL via mail within 3-4 weeks. If you haven't received your new DL after 60 days, call 1-800-777-0133 to check the status.

Luckily, the state of California provides a few hassle-free ways to get your license renewal done quickly and easily. You can renew your license up to six months before the expiration date listed on your ID. The DMV will send you a renewal notice 6-8 weeks in advance detailing all the ways to renew your license.

If you already have a California DL, you can renew it in person at a DMV office, by mail, or online.

7 ? The Brake Pedal. You engage the brakes by pushing down the brake pedal (It is also called a foot valve or treadle valve). Pushing the pedal down harder applies more air pressure. Letting up on the brake pedal reduces the air pressure and releases the brakes.

Air brakes on a semi-truck work using compressed air instead of hydraulic brake fluid. Since semi-trucks are carrying so much weight, they rely on air because compressed air can be constantly produced, unlike hydraulic fluid, which requires refills and can leak, causing the brakes to fail.

In order to operate a vehicle with air brakes, class 1, 2, 3, 4 and 5 drivers must complete an approved air brake course to get a Q endorsement on their driver's license. The air brake endorsement is also required to get a class 1 driver's license.

In big diesel trucks, buses and tractor trailers, the braking system consists of air brakes. Since air is plentiful but hydraulic fluid could get lost in a leak, big vehicles rely on air-powered brakes to keep drivers and everyone else on the road safe.