What are possible causes? A hydroboost power brake vehicle with a hard pedal can be the result of a belt that is loose on the power steering pump, fluid levels are low, power hoses leak or there are valves with leaks or faults on the hydroboost unit. To reduce disc brake squeal, all mating surfaces of the brake should be clean and lubricated. Technician A says a parking brake not fully released could be the cause. Eventually, a sticking brake caliper will wear down the brake pads. d. Neither A nor B. To do this test, drive your car in a remote location with no traffic at a speed of about 30 miles an hour. Even today, your brakes can fail completely, but there are failsafes built into the system to prevent that from happening in most cases. This valve basically allows the rear drums to apply first in the system. A vehicle with 4-wheel disc brakes has a brake squeal. Answer: This means that you have a leak in the system and you most likely have air in the brake lines. Which of the following can cause brake pedal pulsation? b. So im getting drag on my front brakes, both sides, after i drive it about 15-20 miles i jack up the front end the the wheels are real tight to spin by hand and you can hear the pads screeching against the rotor. Brake problems can be daunting if you don't know what's causing them. The same factors can cause cable operated parking brakes to jam up as well, requiring a replacement of the parking brake cable. If your car sits for long periods without moving, moisture from rain or high humidity causes your rotors to rust, except for the patch of rotor surface where the pads rest. Pulsation results from something loose in the system or by an unparallel rotor. The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. Technician A believes that you must depress the quick take up valve. D. loosening the front wheel bleeder screws with the ignition switch on. Answer: It all depends on where you got hit, where the emergency brake is located and if you have electronic emergency brakes. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. . The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. B only Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Slight scoring or heat spots For drum brakes, a 10 lb. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. 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. Consider a system consisting of both objects A and B. Technician B states that the brakes can continue to operate like non-ABS brakes. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. If it the booster, check valve, or vacuum hose is bad, it will likely also cause a vacuum leak and rough engine idle as well, but an engine with a bad valve or head gasket can also cause low vacuum which can effect the brake boost. Symptoms of a Bad or Failing Brake Hose | YourMechanic Advice Answer: You have a rear knocking noise from the drums because your shoes are being pulled away from the backing plate and snapped back into place by the spring clips. A only A slight gap should be present between the pushrod and the master cylinder. I changed the brake pads, but that didn't help much. Technician B says disc brake squeal is often caused by movement of the disc brake pad during braking. Every car since 1968 has had redundant hydraulic systems, not to mention the parking/emergency brake, to prevent complete brake failure.

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