Question about 1999 Jeep Grand Cherokee

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Vacuum booster leaks do I need to disconnect the brake lines when I replace the booster

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Not really it should move forward to let you removed booster
only line to remove would be vacum line

Posted on Apr 03, 2011

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Posted on Jan 02, 2017

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4 Answers

1984 Honda Accord Brake Problem


well aside from the boosters you may also want to check the possitioning rotor and calipers. there is a possibility that something slipped, or leaked, check for brake fluids and try to trace where it is comming from.

the picture below shows how to disassemble the brakes of an Accord, the only special tool you will need is a ball joint fork to seperate the upper and lower ball joints. You have to remove the whole steering knuckle assembly to get to the bolts in back of the rotor and hub assembly.

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hope this helps

Aug 05, 2008 | 1984 Honda Accord

2 Answers

On a 97 gmc truck when you push the brake you can hear air from the brake booster into the cab of the truck and brake travels freely to the floor


When a vehicle is turned off, the brake pedal should remain firm. However, if the driver pushes the pedal lightly and it sinks to the floor, the master cylinder has an internal leak.

Feb 17, 2017 | GMC Cars & Trucks

1 Answer

My 2008 Ford f-450 with the 6.4 tubodeisal is cutting out at 1800rpm n or out of drive also dash say check brake system and won't build boost


You might have a problem with the vacuum pump or the brake booster diaphragm is leaking vacuum. Disconnect vacuum line at pump with engine off and draw vacuum through this disconnected line. If the line will not hold vacuum, find the leak.

Aug 14, 2015 | Ford Cars & Trucks

1 Answer

Lexus brake lights come on when I cut the car off


Power brake vacuum booster might have a leak. Try disconnecting the vacuum line (and plug it so it doesn't leak) and check the brake light with the engine on, then off. No change then the booster has a leak.

Mar 31, 2014 | Cars & Trucks

1 Answer

Power booster seems to leak how to fix


These are not rebuild-able, they must be replaced if they leak.
One that leaks will hiss while the engine is running. The hiss is vacuum leaking, not pressure leaking out.
To possibly check it under the hood, be very suspicious of a leaking vacuum line at or near the booster, not the booster itself. It might be bad, but that is pretty rare.
The last one I changed I thought was defective because it hissed when I applied the brakes, but a new one did the same thing! :-(
If you decide to replace it, you will be unbolting the master cylinder from the unit under the hood, and also unbolting the unit under the dashboard.
Of you are really careful, you might not need to disconnect the master cylinder 's brake lines at all, just gently pull/push it out of the way to change the booster.
Be really careful not to kink the brake lines.
The unit is bolted to the car with usually 2 bolts through the firewall behind the brake pedal.

Jan 12, 2013 | 2002 Buick Century

1 Answer

Breaks wont pump up no air in line.will pump up when car is not running.start it and hardly no pedal


SOUND LIKE POWER BRAKE BOOSTER FAILURE.CHECK TO SEE IF VACUUM GOING TO POWER BRAKE BOOSTER.IF NO YOU HAVE BROKEN OR DISCONNECTED VACUUM LINE TO BRAKE BOOSTER.IF POWER BRAKE BOOSTER GETTING VACUUM MORE LIKELY BRAKE BOOSTER HAS A LEAKING DIAPHRAM.

Dec 03, 2010 | 1999 Oldsmobile Alero

2 Answers

I have a hard brake peddel almoust have to stand on them what could this be


You no longer have vacuum assistence. The brake master cylinder is mounted on the brake booster which uses vacuum generated by the engine to "help" you push the brake pedal. On diesel engines there is normally a vacuum pump on the rear of the alternator which generates this vacuum. On petrol engines the vacuum is generated by the engine itself. Follow the pipe from the booster to the inlet manifold or alternator(diesel) and check for leaks along the whole length and at the joints. Replace the pipe if leaking. If no leaks are found the booster needs replacing. If you have a diesel engine, check the operation of the vacuum pump first before replacing the booster. Make sure the alternator is turning(belt in place) at idle. Disconnect the pipe at the rear of the alternator and hold a piece of paper over the pump opening to check operation. Do not use your hand as this will result in injury even with the engine at idle. Replacing the booster will see you upside down under the dashboard swearing, pleading and begging because that's where the bolts are that hold the booster in place. The master cylinder needs to be removed from the booster before the booster can be pulled from the engine bay.

Oct 20, 2010 | 1991 Chrysler Town & Country

1 Answer

Stalls or wants to turn off when pushing brakes


Check for vacuum leak within power brake servo unit.
Remove vacuum hose from brake servo and block off the open vacuum line from the engine. Check that engine then runs normally when brakes applied.
Do not drive the vehicle with the vacuum servo disconnected, as the brakes may not be effective. - The pedal pressure required to apply the brakes effectively may exceed your capabilities.

If the brake booster servo diaphragm is leaking it will need to be replaced/repaired.

Nov 03, 2009 | 1991 Honda Accord

1 Answer

Need to replace a brake booster on a 1998 chevy cavalier


get ready for some work.you need to remove the master cylinder nuts that hold master cylinder to brake booster.once you remove nuts you have 2 choices remove master cylinder to remove booster. to keep from bending brake lines.or you can leave master cylinder in pull it toward you easily careful dont bend lines .disconnect vacuum line at booster .go inside vechicle to floor on driver side loosen four nuts on floor to booster .disconnect power brake push rod from brake pedal .dont force pushrod to the sides when disconnecting it.remove four booster nuts then remove booster.when in stalling the new booster loosely install four nuts then connect the push rod to the brake pedal .install new clip tighten the booster unit .if you decide to remove master cylinder use inline wrenches on master cylinder to remove lines.also plug the master cylinder brake line holes to keep from losing all brake fluid.

Apr 26, 2009 | 1998 Chevrolet Cavalier

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