Technician B believes there is an issue with the lateral runout of the rotor. It also expands when subjected to high pressures. a. with the engine off The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. Then, it needs to be backed off until the wheel begins to spin freely. Answer: Yes, brake pads can cause problems for brakes on a car. Situations such as heavy loads or long downhill grades where the brakes are used heavily can lead to overheating of the lining, drums, or brake fluid, resulting in a loss of braking called: Which brake is used for holding a vehicle in place when its stationary? residual valve is used to hold pressure against the . c. Parking brake out of adjustment A possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. The other major way brakes act up is when they fail to disengage completely in one way or another. 505050 Figuring out the problem and solutionis simply the result of having the right knowledge combined with an intelligent, systematic approach. Correct answer B-If the amber light is on it indicates an ABS fault and the system will revert to regular brake operation without ABS. The master cylinder actually contains two pistons and seals, which in simpler systems controlled the front and back brakes separately, or the diagonally opposite wheels, so at worse you would only lose half your brakes. Loose wheel bearing Answer: Is your abs light on? The only fix I recommend for a faulty master cylinder is to replace it with a new one. Over time, a caliper can freeze up gradually, a process that can go unnoticed for a long period of time. A only b. Vacuum Pressure Vacuum - or really lack of vacuum pressure - is the most common cause of a hard brake pedal, and therefore the first thing to look at when a hard pedal is present. Brake drum machined beyond its limit d. Neither A nor B. When that happens, I release the brakes and apply them again super fast. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. Most instances of a hard pedal come down to a failure in the power boost system, whether vacuum based or hydro-boost (used mostly on diesels, we won't be covering it here). . I highly recommend having your car towed; this is a very dangerous situation, and the problem needs to be fixed before the car is driven. Brake pads are being replaced on a vehicle with four-wheel disc brakes. All the other answers are improper ways of adjusting drum brakes. For drum brakes, a 10 lb. Abnormal noise. 3 Hydraulics-Related Sources of Brake Drag Who is correct? b. Four-wheel alignment D. Neither technician. After that, fixing it is often easy with the help of your Haynes manual. B only tech B states that the brake-by-wire system uses the break pedal position and pedal application speed as indicators of what the drive wants to do. a. "Scratcher" and "sensor" are types of disc brake pad __________ indicators. Then you should try the brakes. Residual check valve A vehicle is equipped with a vacuum brake booster. What is the cause? One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. If a 40 kg person is accelerating at 10m/s^2, then the magnitude of the force acting on him or her is 400 N. Write a C++ statement that prints the message The number is not valid. if the Answer: It is most likely either a blockage in the line or a worn brake master cylinder. Push and hold the release button on the end of the emergency brake handle; this is so the emergency brake does not lock into place and can be released easily. Who is correct? c. Both A and B Brakes that Grab: If there is oil, brake fluid or grease on the pads, they will slip and then grab hold. Troubleshooting A Hard Brake Pedal | Classic Car Restoration Club Hopefully this information will help you (and your mechanic) decide where to start when fixing your problem. 4-wheel disc brakes on a vehicle are causing brake squeal.