The slack adjuster is the part of an air-brake system that is used to adjust the brakes when needed. The slack adjuster is located on the air canister on the axle housing near the wheel. On vehicles with drum brakes, it is between the pushrod and the S-cam. On vehicles with disc brakes, it is between the pushrod and the power screw.Know More
Air-brake systems use compressed air to transmit pressure from the brake pedal to the brake pads. They are typically used in larger vehicles such as trucks and buses. All air-brake systems run the risk of moving out of adjustment over time. Out-of-adjustment brakes are the most reported problem from roadside vehicle safety inspectors. Out-of-adjustment brakes constitute a safety hazard, as vehicles with excessive brake slack can be difficult to stop.
All vehicles manufactured since 1994 have automatic slack adjusters that adjust themselves during full brake applications. Automatic adjusters should only require manual adjustment during installation. If a brake system with automatic slack adjusters requires periodic adjustments, it is an indication that the automatic slack adjusters are defective and should be repaired. All brake systems, whether they have automatic or manual slack adjusters, should receive regularly scheduled maintenance checkups.Learn more about Brakes
Perform an air brake test by checking the emergency brake, cut-in and cut-out limitations, static air levels, applied air levels and low-air alarms. You should also inspect the braking system for any obvious damage and check to ensure that the push rod moves between 1.5 and 2 inches when engaged.Full Answer >
Air-over-hydraulic brake systems operate using a combination of compressed air and hydraulic pressure, and the release of the air and hydraulic pressure engages the master cylinder. It then applies pressure to the valves, and the brake fluid is released. The brakes then exert friction on the tires, which stops them.Full Answer >
The first step to troubleshooting an anti-lock brake system is checking the fuse that manages the brakes. If the fuse is functional, check the harness of the ABS controller for signs of corrosion. Then check the wheel sensors. If those are in order, you might need a new ABS controller.Full Answer >
Brake pads last anywhere from 30,000 to 70,000 miles, and brake rotors can last about three times longer. The exact mileage depends on the type and composition of the pad's friction material, the owner's driving habits and driving conditions.Full Answer >