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Breaks
- Thread starter GIJill
- Start date
Matthew Currie
NAXJA Member #760
- Location
- Vermont, land of big clay
If this noise occurs when you push the brake pedal standing still as well as moving, suspect a leaking vacuum booster. Cure is a new booster.
Maybe not. The vacuum booster is the big can behind the master cylinder. It has a black rubber hose running from the engine. A master cylinder kit sounds like a rebuild kit with cups and springs to repair it so that it won't pass hydraulic fluid internally.
What we need is more information. What year and mileage your Jeep is will help, along with finding the source of the noise. Is it louder under the hood or under the dash? - this will help.
What we need is more information. What year and mileage your Jeep is will help, along with finding the source of the noise. Is it louder under the hood or under the dash? - this will help.
My jeep is an 87 with 23k miles. It's loud when I step on the breaks inside my truck I haven't tested out to see if it's louder or not under my hood. Yeah my b/f said it was probably the break booster thing, but I wanted to make sure before I went to buy one.
Matthew Currie
NAXJA Member #760
- Location
- Vermont, land of big clay
As TiRod notes, it shouldn't need the master cylinder rebuild if the problem is just a leaky booster.
Just to be sure what is what, get in the vehicle and step on the brake. Now start the engine. The brake pedal should sink partway down, then stop sinking. IF it doesn't sink at all, then the booster is not only leaking, it's not working. If it continues to sink to the floor, you also need to look at the master cylinder and other brake issues. If it sinks some then stops, that's what is supposed to happen. You'll still need to replace the leaky booster, though, because even if it works to some extent, it might run out of boost under hard braking, the very moment you need it most!
You should also check the fluid level in the master cylinder to make sure it isn't leaking, because sometimes (not always) a leaky booster can be caused by brake fluid that has leaked into it from the master cylinder.
Brakes are mighty important. So if you don't feel comfortable dealing with this stuff, don't be embarrassed to go to a garage.
Just to be sure what is what, get in the vehicle and step on the brake. Now start the engine. The brake pedal should sink partway down, then stop sinking. IF it doesn't sink at all, then the booster is not only leaking, it's not working. If it continues to sink to the floor, you also need to look at the master cylinder and other brake issues. If it sinks some then stops, that's what is supposed to happen. You'll still need to replace the leaky booster, though, because even if it works to some extent, it might run out of boost under hard braking, the very moment you need it most!
You should also check the fluid level in the master cylinder to make sure it isn't leaking, because sometimes (not always) a leaky booster can be caused by brake fluid that has leaked into it from the master cylinder.
Brakes are mighty important. So if you don't feel comfortable dealing with this stuff, don't be embarrassed to go to a garage.
Apanthropy
NAXJA Forum User
- Location
- Phoenix
TiRod said:
Wait, what's this? tell me more! since I'm inevitably the one who's gonna end up doing the work on Jill's jeep
(just you watch, this time next year her jeep will be bigger and badder than my truck and I'm gonna feel like a chump
)dusterboy71
NAXJA Forum User
- Location
- indiana
Power brake booster is shot.they're about $89.00 and takes about an hour to hour and a half to change.
Matthew Currie
NAXJA Member #760
- Location
- Vermont, land of big clay
Apanthropy said:Wait, what's this? tell me more! since I'm inevitably the one who's gonna end up doing the work on Jill's jeep
(just you watch, this time next year her jeep will be bigger and badder than my truck and I'm gonna feel like a chump
Check the archives, other sites and what not. (I'm too lazy this morning!) I think there is an article somewhere that describes the transplant, but it is not a completely simple bolt-on. The later brakes are definitely better, though.
