Replacing vacuum pump & booster?
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Senior User
Joined: Mar 2013
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Replacing vacuum pump & booster?
Anything special about doing this or is it straight forward?
I'm literally just throwing parts at my truck til the brake pedal is fixed so I ordered a new OEM booster and Dorman vacuum pump.
Thanks
I'm literally just throwing parts at my truck til the brake pedal is fixed so I ordered a new OEM booster and Dorman vacuum pump.
Thanks
Postmaster
Joined: Feb 2011
Posts: 3,560
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personally, i would suggest diagnosing before throwing parts at it. i've killed a few vacuum pumps, but have yet to kill a booster. connect a vacuum gage to the line from the pump and see how it responds. then also try it connected into the vacuum tree and see how it responds there. a small vacuum leak can really throw things off.
for the vacuum pump, unbolt it from the top, then drop it out the bottom. booster should be like any other - dismount MC and slide it forward, disconnect pushrod from pedal, and unbolt from firewall.
for the vacuum pump, unbolt it from the top, then drop it out the bottom. booster should be like any other - dismount MC and slide it forward, disconnect pushrod from pedal, and unbolt from firewall.
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I have diagnosed it. And nothing works. Here's my thread
https://www.ford-trucks.com/forums/1...revisited.html
https://www.ford-trucks.com/forums/1...revisited.html
Lead Driver
Joined: Apr 2008
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probably the vacuum pump if NOTHING vacuum related works. Usually the only time the booster goes is when the master cylinder is leaking, and therefore should be replaced as well. Just did the booster / master in my 92 took be about an hour. The vacuum pump is easy too, just need a puller to get the pulley off.
Postmaster
Joined: Feb 2011
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and not just any puller. has to be the kind made just for power steering pulleys and such, and may have to be customized to fit. my local parts store has the one i customized, and i use it every time i kill a pump.
Logistics Pro
Joined: Apr 2005
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Sorry, but that's funny. That's the kind of thing I expect from a dealer.
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Fleet Owner
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From: Mi'kma'ki
so did you end up bypassing the RABS?
i did all this too,and the only way i got real brakes was the hydroboost swap.the vac just lacked the nuts required.the pump was the only thing not replaced.maybe that would have helped,but the brake fade/sponge during a panic stop when loaded was so far from safe,i called uncle and went directly to hydro.
i did all this too,and the only way i got real brakes was the hydroboost swap.the vac just lacked the nuts required.the pump was the only thing not replaced.maybe that would have helped,but the brake fade/sponge during a panic stop when loaded was so far from safe,i called uncle and went directly to hydro.
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Postmaster
Joined: Feb 2011
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if you have air in the system, nothing you do on the vacuum end of things will affect that.
if the vacuum system fails, you'll have a hard pedal and have to push hard to stop
the first time you push the pedal, the vacuum system has full power, and little pedal effort is required. pumping the pedal bleeds off much of the vacuum pressure, resulting in the brake booster doing less of what its made to do. this results in a firmer pedal only because you have less vacuum pressure. this is just the nature of the system.
try pumping the brakes several times with the engine off to bleed off vacuum pressure, then letting it sit for a minute, then seeing how the brakes feel. if everything is right, you'll have a hard pedal. if theres air in the hydraulic system, you'll have that soft pedal that builds up as you pump.
as it is, i don't think you'll gain anything by just throwing parts at it
if the vacuum system fails, you'll have a hard pedal and have to push hard to stop
the first time you push the pedal, the vacuum system has full power, and little pedal effort is required. pumping the pedal bleeds off much of the vacuum pressure, resulting in the brake booster doing less of what its made to do. this results in a firmer pedal only because you have less vacuum pressure. this is just the nature of the system.
try pumping the brakes several times with the engine off to bleed off vacuum pressure, then letting it sit for a minute, then seeing how the brakes feel. if everything is right, you'll have a hard pedal. if theres air in the hydraulic system, you'll have that soft pedal that builds up as you pump.
as it is, i don't think you'll gain anything by just throwing parts at it
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Senior User
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I would agree. Except the pedal feel did not change at all with the new master.
Truck's been parked for 3 hours. I just went out and hit the pedal with the truck off.
First push on the pedal it goes to the floor. Next 3 times it gets less soft and eventually hard.
if you have air in the system, nothing you do on the vacuum end of things will affect that.
if the vacuum system fails, you'll have a hard pedal and have to push hard to stop
the first time you push the pedal, the vacuum system has full power, and little pedal effort is required. pumping the pedal bleeds off much of the vacuum pressure, resulting in the brake booster doing less of what its made to do. this results in a firmer pedal only because you have less vacuum pressure. this is just the nature of the system.
try pumping the brakes several times with the engine off to bleed off vacuum pressure, then letting it sit for a minute, then seeing how the brakes feel. if everything is right, you'll have a hard pedal. if theres air in the hydraulic system, you'll have that soft pedal that builds up as you pump.
as it is, i don't think you'll gain anything by just throwing parts at it
if the vacuum system fails, you'll have a hard pedal and have to push hard to stop
the first time you push the pedal, the vacuum system has full power, and little pedal effort is required. pumping the pedal bleeds off much of the vacuum pressure, resulting in the brake booster doing less of what its made to do. this results in a firmer pedal only because you have less vacuum pressure. this is just the nature of the system.
try pumping the brakes several times with the engine off to bleed off vacuum pressure, then letting it sit for a minute, then seeing how the brakes feel. if everything is right, you'll have a hard pedal. if theres air in the hydraulic system, you'll have that soft pedal that builds up as you pump.
as it is, i don't think you'll gain anything by just throwing parts at it
First push on the pedal it goes to the floor. Next 3 times it gets less soft and eventually hard.