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Symptoms of a Bad or Failing Hydraulic Brake Booster
Common signs include less braking power, a brake pedal that is hard to press, and fluid leaks.
How to Buy and Install a Booster Seat
Booster seats are important safety features for young children. When a child has outgrown their child restraint system, but is not yet big enough to safely fit the adult-sized lap...
How to Replace a Power Brake Booster
Replacing a power brake booster can be challenging, as it requires several steps and the proper tools to do so.

Related questions

I poured seafoam in my brake booster I thought it went there instead of in the vacuum
Hello, the brake booster assembly will have to be replaced. There are rubber diaphragms that degrade from seafoam. The hissing sound is a vacuum leak with the booster. I recommend having a certified YourMechanic technician come to your location to...
Brake pedal goes to the floor when the engine is on
The first thing you'd want to do of course is pull off all the wheels and look for the leaks. But if you have no leaks, yours is the classic sign of a bad brake booster. When brake boosters go...
While shifting, truck stalled; pulse in brake pedal
Hello. It is possible that a brake booster is faulty. It is also possible that there is a leak in the brake booster hose, the intake, or one or more vacuum hoses in the engine. It is a good idea...
Is a leaky brake booster unsafe if fluid level is o.k.?
If your brake booster is leaking but your brake fluid level is full, your brake booster would be leaking vacuum. This would mean that your booster has a crack, the check valve is bad, or the hose that connects to...
Had bad brake booster after pulling trailer replaced still has vacuum leak inside cab ?
Make sure you do not have a vacuum leak between the brake booster and master cylinder. Sometimes the seal does not sit good and will leak. If it is okay, and you hear a vacuum leak inside the vehicle, then...
Brake pedal sinks all the way to floorboard
Hi. Sounds like a sweet setup you have there for your 1998 Nissan 240SX. It sounds to me like the lack of brake pedal pressure could be due to a leaking brake booster possibly or a brake booster hose collapsing...
Brake Booster
I think the reason the truck was running rough was the broken vacuum connection and it went to the brake booster. You may have only had partial vacuum to the brake booster before, and now have full assist. You should...
Brake booster has oil in it. Engine oil.
The vacuum pump was the source of the oil in all probability. Also, check the wastegate vacuum lines for any signs of oil. If there's any question then I'd suggest replacing them too. If you'd like a fresh set...
P0236 circut A range performance
Hello. The boost sensor is on the intercooler exit hose, driver side, bottom of the radiator area, close to the rubber coupling down there. The intercooler looks like another radiator, and sits in front of the coolant radiator. This is...
Car making squeaking and growling noise from under the hood by alternator
The shaking and stalling out as you describe can be caused by a variety of issues. When this happens there is likely a Check Engine Light on that should register a fault code in the car's computer. I would recommend...
Brake pedal is hard to push
Hi there, thanks for writing in. I'd be happy to provide my insight. There is a possibility that they may have overfilled the brake reservoir with brake fluid. Start by checking that it has the proper amount. Secondly, it is...
Damage to my brake booster
Brake fluid in the brake booster is definitely a sign of a leaking master cylinder as you know. Additionally, brake fluid in the brake booster will also cause deterioration in the diaphragm resulting in failure leading to vacuum leaks and...
Brakes not working at all - 1999 Jeep Wrangler
If your master cylinder is not losing fluid and you tried bleeding the system then your master cylinder is bad. The internal rubber cups got damaged when you allowed the pedal to go to the floor the first time. You...
Hard brakes
If the brake fluid warning light is on, check the level of brake fluid in the reservoir. If you have power brakes and the pedal pressure required to stop the car has increased the mostly like cause is a fault...
Brakes spongy after booster and master cylinder replacement
Hello. You need to double check the installation since you may have put the brake booster rod on the brake pedal wrong causing binding of the brake switch and causing the system to not bleed correctly. Also make sure the...
My brakes are hard when depressed.
Hey there, thanks for writing in. The brake booster has a bad vacuum supply or the booster internal vacuum valve is bad and the booster needs replaced. The complete brake system should be checked and diagnosed by a mechanic to...
abs light on brake line broke have been replace I bleed brake line but brake pad still go to the floor now wheels lock up
Hello. If the brake pedal is going to the floor then that means that it is not building pressure. If the brake system has been fully bled and there is no air in it then most of the time it...
Brakes don't work very well when it's cold
You have two different issues here. The slow crank may be that the battery is getting weak. It may need to be replaced or the terminals cleaned. The other issue of the high idle and braking issue is probably due...
Brakes don't work properly. Hard to push - 1960 Jeep CJ5
Since you do not have power brakes, a clogged hose line or fitting may be the cause or a sticking/binding caliper may be the issue. You may want to enlist the help of a mechanic, such as one from YourMechanic,...
Where is the vacuum check valve located on a vacuum assisted brake booster?
The check valve is built into the hose that connects to the brake booster. The hose should be disconnected from the booster connection when removing the master cylinder. If you apply vacuum to the hose after you remove it from...

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