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_______power brake booster, check vacuum to booster and the check valve for brake booster. primary symtom is high hard pedal that requires greater then normal pedal pressure to stop car. testing booster= pump brakes several times with engine off to deplete stored vacuum. turn on engine with pushing slightly on brake pedal. you should be able to feel the pedal fade away a bit, and then become firm. But not hard. if you feel nothing at the pedal when engine starts. Brake booster is not working. Good-day! make sure vacuum is going to booster with engine running. it may just be a bad vacuum line or check valve.
hissing sound is a vacuum leak somewhere on the power assist part of the system as in a bad booster..try this test..with the car off..push the brake pedal down a few times and release all the vacumm and see how far the pedal goes down..after a few pumps with your foot it should become hard and drop just a bit..once it feels"solid' or hard..hold the pedal down with moderate pressure.. and start the car back up..the pedal should drop a bit further but less than halfway.. if it drops further it needs attention..good luck especially if it goes almost to the floor..
Hi P, The most usual cause of the brake pedal action becoming hard is a defective return seal in the brake master cylinder. When the brakes are depressed fluid is pushed into the wheel cylinders, activating the brake pads and shoes. After a few operations of the braking system the fluid fails to return to the master cylinder and with each further action the brakes become tighter. After the vehicle stands for some time the pressure gradually releases and frees the brakes. Have the brake master cylinder checked. It's good policy to replace the brake fluid once or twice a year as part of the major service. Regards John
get a new one but perhaps this is not the problem brake boosters seldom go bad. press on brake pedal a couple times until firm. then start engine while holding brake pedal the pedal should move down towards floor upon start up. if this is not true then check to see if the air line from the manifold to brake booster is in good non cracked and make sure you are getting good manifold pressure as well. repair hose or manifold if your not getting good pressure then check booster again as described above
you mean you hear it WHEN you push pedal ? power booster could be going bad ! check allvacuum lines, sound good ? any trouble with brakes ? hard pedal ? tighten throttlebody mounting bolts ! gaskets do go bad, they get hard, dryout, become brittle, vacuum leak !!! replace vacuum lines if cracked, dryed out, etc.,, you can use a 3 to 4'-0 pc. of hose to listen hissing sounds where vacuum occurs to locate the leak .
Check Brake pedal sensor (contact behind pedal), this part tends to break on alot of Hondas it will apear broken most likely. If that's not the issue you could try to check or pull fuses that are associated with the alarm (check owners manual).To overide the shifter there is a small tab next to the shifter itself pop this up with a screwdriver and then depress the tab underneath, while depressing the tab shift the vehicle out of gear. You may ask why the brake pedal sensor? When you change your car into gear from park you have to depress the brake pedal, when you depress the brake pedal the sensor becomed engaged and sends a signal to the cpu which sends a signal to a sensor by your shifter and unlocks it. If the brake pedal sensor is broken or faulty it will not engage properly and there will be no signal sent.