Question about Jeep Cherokee

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Have replaced front brake disc,pads,calaipers,master cyclinder and vaccume booster. when the jeep is off the brakes are hard but when you start the jeep the brakes go to the floor/

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You have air in the lines. you need to bleed them.

Posted on Aug 23, 2008

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I have a 2008 equinox. after driving 20 mins in stop and go traffic, brake pedal becomes hard and can't move the car. Replaced master cyclinder, brake booster and brake pedal sensor. Help


Check the flexible brake lines on the front two wheels. The rubber inside can become swollen which will restrict the release of pressure when you let off the brakes. After a few brake applications, enough pressure will build up to keep the brakes applies to the front two wheels. It will also severely wear the front pads .

Sep 25, 2015 | 2008 Chevrolet Equinox

1 Answer

When truck is off,pedal is hard. after starting, pedal goes to floor. replaced master cylinder,bled brakes. changed front and rear pads.


I would inspect the brake booster for vacuum leak. When the booster is not working you get a hard pedal, yet when you start the vehicle the pedal will hit the floor because of the damaged diaphram inside the brake booster.

Oct 21, 2012 | 1996 Chevrolet C1500

2 Answers

No brakes I think the booster was going out because my peddle got soft but would still stop me then i changed my brake pads shortly after the brakes completly went out and can now only stop with the...


The problem is not the booster, the job of the booster is to make braking easier. If the booster went out the brakes would be hard to press.
Your soft pedal is likely due to air in the brake lines. Bleed the brakes and go from there.

Dec 13, 2010 | 1992 Buick Park Avenue

1 Answer

Brake boosters


you can tell if the brake booster is bad, rearly it goes bad, your master cyclinder usually go out before your brake booster will. It feel spoon-gy and while pressing down on the brake peddle holding it down you can feel the pressure bleed off with no resistance. If the brake booster is bad you have only ONE shot for braking each time; its very dangerous. Did you bleed the brake lines to release the the air out of the system when you replace the pad? whom ever did your brakes should know to bleed it. having air in the line can be dangerous as brake will not function and operates properly and can cause an accident. If you did bleed the brakes and your booster is fine then you have a master cylinder problems. master cylinder gives you a spoon-gy feel and when braking the peddle it tend to go to the floor and you have to let your foot up to build the pressure and applied the brake again to make it stop. Master Cyclinder use or rebuilt will cost you 30.00 bucks and new will be 58.00 bucks and they are easy to replace. Just make sure you have plenty of extra brake fluid to bleed all 4 brake line..I recommend you reused the brake fluid when bleeding the unit saving some money than wasting the fluid, glass jar is the best for capturing the bleed fluid with automotive smallest vacum hoses you can purchase at any auto discount store 58 cent a foot, which you only need 2 foot. good luck I hope that help some.

Jul 10, 2009 | 1998 Chevrolet Cavalier

2 Answers

It is very hard to push on the brake pedal


vaccum brake booster may be in op or vaccum is to low.

Jun 08, 2009 | 2005 Dodge Grand Caravan

1 Answer

STILL DOESN"T WORK!!!


you need to use a pressure system to add fluid into the master cylinder and then bleed it.

Mar 26, 2009 | 1994 Jeep Grand Cherokee

1 Answer

NO brakes


U have air in the system, u need to use a pressure bleeder.

Mar 25, 2009 | 1994 Jeep Grand Cherokee

1 Answer

Brakes !


i would check the brake booster first that is what gives you the resistance to return the peddle to operating hight.no on the abs because even if it fails it wont chane anything but the cars tendency to lock up the wheels

Feb 26, 2009 | Toyota Passenger Cars & Trucks

1 Answer

F150, 2000, problems with brakes


sounds like the vaccum booster is bad. check vaccum line going to booster for cracks. vaccum booster is located behind master cylinder.

Dec 15, 2008 | 2005 Ford F-150

1 Answer

1991 jeep comanche brakes


check under dash for leaking vaccum switch. usually manufacturers use vac switches to release the e-brake automatically when applying the brake.

Jul 17, 2008 | 1991 Jeep Comanche

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