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IF there is a sender unit in the side of the master cylinder then screw it out and then replace it as it may be stuck out between pistons in the master cylinder.
A hissing sound when depressing the brake pedal is an indication that the booster is leaking. Another indication is that the pedal will be more difficult to push down before starting the car after it has been sitting for a while. A faulty brake booster will only make it more difficult to apply the brakes. However, it should be noted that a leak in the booster may be caused by brake fluid leaking from the master cylinder into the booster and this could become a dangerous problem.
It sounds like the rubber diaphragm in the brake booster has developed a leak producing the hissing / sucking noise. The only option is to replace the booster as a complete assembly as they need specialist tools to repair. If the booster fails completely you will still have brakes but the pedal will be very hard and it will take a lot of muscle power to stop vehicle. Best to have booster replced soon before you experience situation described above.
Check the vacuum brake booster and check valve maybe there is a problem there that is amplifying the vacuum inside the booster and applying the brakes. I hope this helps, let me know.
You have done the brake booster.Its a mechanic shop job.If you jab the brake a few times in a short sequence,the motor should slow down just a fraction.It might.Hope this helps
The power brake booster has a bad valve. I can't suggest where to find a new valve for it, but you can buy a rebuilt replacement. They are usually not hard to put on.
get a volt meter set it on dc scale start your engine .take meter hook it to battery it should be 13.5 to 14.5. it shouldnt go over 15. if it goes over 15 volts your alternator has a bad voltage regulator. take it back get you a new one.
it means you have a vacuum leak that bleeds off vacuum after shut down or your check valve in the large vacuum hose going to the brake booster is bad. Replace the check valve first
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