Brakes on my Mark 8 have become hard as the brake pedal takes longer to come to a stop and there is a hissing sound. I presume that is the master cylinder power assist..What would that cost to replace parts and labor..
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it sounds like the brake servo isn't working but you should still have some better brakes than you dascribe so i would also check the master cylinder , whick is connected directly to the servo , quick check ,engine running remove, brake fluid resovoir cap, pump brake pedal and get some to look into the fluid resovoir and tell you is there are air bubbles or not , if bubbles most likely a seal has blown if no bubble then most likely a mechanical part of the brake system ie master push rod at fault , either way i'd get a mechanic to check as you dont take chance's with brakes
Check the vaccume line going to the brake booster. BUT if you can hear a hissing sound from inside and the pedal is hard to press more than likely your going to need a new brake booster and a new brake master cylinder.
brakes
on my Mark 8 have become hard as the brake pedal takes longer to come
to a stop and there is a hissing sound. I presume that is the master
cylinder power assist..What would that cost to replace parts and labor..
Two issues...
The brake booster has a ruptured diaphragm. Replace the booster.
It is located under the hood between the brake master cylinder and the firewall.
Your master cylinder may be leaking fluid internally past the plunger.
Have it examined when you change the booster.
Might check around the big black round muffin shaped chamber adjacent to the master cylinder for a loose vacuum hose or crack therin; the hissing sound seems likely to be the air rushing in as you loose the vacuum that supplies the power to assist your braking effort (power brakes)---as this goes, so goes your peddle until it reaches the actual piston pushing the brake fluid (which should be firm like with non-power brakes). ...maybe have an assistant push on the peddle while you listen with a piece of hose or a stethescope to find the leak (or I suppose the power unit diaphragm could be shot/leaking--hence replacement), but since you said after bumpy road etc, one could hope for a simple dislodged vacuum hose or fixable crack.
My vote would be the Master Cylinder.
I had a truck sit for 4 years. After getting running again, it did the same thing you're describing. No brakes. I ended up replacing the Master Cylinder to fix the problem. Just make sure you bleed the system real good.
how do i fix this
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