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Re: booster vacuum hose
Locate the hose... it has to be one that can withstand the vacuum imposed on it, so that it does not collapse when their is vacuum to it which in this case is pretty much all the time. if you are not sure where the hose is.... look for your master cyclinder ... the large round metal can behind it next to the firewall. if you are not buying a direct replacement hose... take the old one off and take it to a auto shop or hardware store... get one a little longer then you need keeping in mind if you have to cut it you can't fix a hose that has been cut to short. there is a special tool for taking the clips off. tho you can usually just use a pair of pliers to squeeze the two metal tabs together as you move it back from the connection.
abit verbose answer and if i've not covered anything feel free to ask
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Usually theres a plastic valve mounted on the booster thats connected to a vacuum source. Remove it from booster(they usually just pull out) & hose, then suck& blow on one end. Air should pass only one way. If it passes both ways the valve should be replaced. Check to c if hose holds vacuum by placing thumb on hose end to feel for suction (motor running) & to listen for hissing. Replace hose if suction is low &or hisses. Could be a vacuum leak elsewhere in wich case performance would suffer & idle would be eradical.
That hard pedal is a sign of a vacuum leak on the brake booster.Check the vacuum hose on the booster for holes and with the engine running have someone push the brake pedal while someone else watches the hose to see if it is collapsing when the brake is applied.If it does that will be your problem.Replace the 3/8 vacuum booster hose.It will have to be the thick hose just for a vacuum booster or it will do the same thing if that is what is wrong.
Sounds like you have a vacuum leak to or from power brake booster. Check vacuum hose & plastic check valve that plugs into booster on the back of master cylinder. If hose or fitting not broken or collapsed most likely booster is leaking vacuum & will need to be replaced.
If there are no brake line/fitting leaks and no crimped or bent brake lines/hoses:
The key to my answer is the sound of air leaking...
Check the Brake Booster to the rear of the Master Cylinder.
1. Check the Vacuum Hose going to the Air Resonator with the one way check valve. Make sure the Vacuum Hose does not have cracks, holes, etc.; or does not collapse with the engine on. If there are any problems with the hose - replace the hose. With the engine on: remove the Hose for the Resonator and check for a vacuum. CAREFULLY: Remove the Resonator and reconnect it to the Vacuum Hose. Again check for the presence of a vacuum coming from the inside of the Resonator. If the Hose had a vacuum, but the Resonator does not = Replace the Resonator. If there is a Vacuum - Reconnect the Vacuum Hose and Resonator to the Brake Booster
2. Checking the Brake Booster Seals:
a. While the Engine is running: Push in the brake pedal. Stop the Engine while keeping the Brake Pedal pushed in.
(1) If there is a change = the Brake Pedal sinks to the floor: The Brake Booster has a Air Leak.
(2) If there is no change = GO TO TEST 2 (#3 below)
3. Turn the engine on and wait a couple of minutes and turn the engine off. Push in the Brake Pedal several times.
a. If the Pedal goes down farther the first time, but continues to rise = gets harder after the 2nd, 3rd time the Brake Booster is fine.
b. If the Pedal continue to go farther down on each push = the Brake Booster has a leak.
One seal in particular - located where the Brake Booster is attached to the Fire Wall - located behind the Brake Pedal Arm. Check the mounting bolts for tightness. With the engine on and a partner pushing on the Brake pedal: try to determine if that rear seal is where the air is leaking from.
Any Air Leak in the Brake Booster Main Seals = a new (remanufactured) Brake Booster must be purchased, as these are not repairable.
Let me know if this helped. or if you have additional information or questions. Feel Free to contact me at FixYa.com!
Assuming that there is no problem with the engine creating vacuum, there is either a vacuum leak in the vacuum hose to the power brake booster unit, the check valve between the power brake booster unit and the vacuum hose is leaking, or the brake power booster unit needs to be replaced.
check the large vacuum hose on the vacuum booster,unplug it from booster and make sure it is getting alot of vacuum from the engine intake,if you have a blockage in the hose that will give you this problem,if it is ok,reconnect hose and start car,listen closely as you push down on the brake pedal,to see if you can hear vacuum leaking from under dash,if you do the diaphram in the booster is cracked and you will need to replace the booster.and even if you don't hear vacuum inside you will need to replace it