ORIGINAL PROBLEM I have a 1996 jeepI have a 1996 jeep grand cherokee 4x4 and when i start to hit the brakes or come to a stop the car shakes really bad up front, and sometimes it cuts off. then when i start to hit the gas it hesitates a bit, but once i am driving everything is fine. More I have a 1996 jeep grand cherokee 4x4 and when i start to hit the brakes or come to a stop the car shakes really bad up front, and sometimes it cuts off. then when i start to hit the gas it hesitates a bit, but once i am driving everything is fine. Comments: Jan 14, 2010 - im not completely sure what to do, do you mean blow in the break booster hole, the hose?? however to give you more information. when i get in the jeep and press the brake it goes down a bit and i can hear an air sound when i push down so im not sure if that is normal. also i checked the brake fluid and it was low but i fill it and nothing changed. the symptoms normally happens when i initially have my foot pressed down on the brake pedel and try to put the car in drive or reverse. it would shake and the rpm gauge will go very low and the engine would idle at a low rate just between cutting off and staying crunk, also the battery gauge would go below normal. sometimes it will catch and stay at a normal position and other times it will cut off Jan 14, 2010 - to give you more information. when i get in the jeep and press the brake it goes down a bit and i can hear an air sound when i push down so im not sure if that is normal. also i checked the brake fluid and it was low but i fill it and nothing changed. the symptoms normally happens when i initially have my foot pressed down on the brake pedel and try to put the car in drive or reverse. it would shake and the rpm gauge will go very low and the engine would idle at a low rate just between cutting off and staying crunk, also the battery gauge would go below normal. sometimes it will catch and stay at a normal position and other times it will cut off Jan 14, 2010 - i did want to add when i did remove the valve connected to the brake booster air was released from the booster. i dont know if that was a symptom of a bad booster as well Jan 14, 2010 - very helpful thanks, Im going to pick a brake booster up from the parts place today CURRENT PROBLEM i have replaced the brake booster thanks to everyones help and advice. which calmed the problem for a day. like i mentioned the jeep will run fine once it im driving. the problem i am having is when i put the jeep in reverse the rpm will almost go down to 0 and the car would shake. sometimes it will just cut off. if it doesent cut of it will just continue to shake and contantly try to get at a normal rpm. if i sit there a let it stall for a while and then put it in park or neutral the engine will rev up and the rpm gauge will go up to almost 3 as if im pressing the gas, and then it will go back to normal.

I am going to post this link you need to look at it. It will show you some components associated with vacume lokk at each vacume part and see if its in your jeep then follow those lines from that specific vacume part to the other end where they connectall the while looking for a cracked line or vacume leak.If you come across a part thats not in your jeep dont be alarmed your jeep may not be equipped with it.But the parts your jeep does have has vacume lines you need to check. There may also be a vacume routing diagram sticker under your hood if you can make sense of it it tells you where each vacume line goes to.On this link also when your looking at a vacume part some will will have an option that says replace if you click on that it should tell you location and how to replace it. I dont think they all will but believe most of them will.I hope you find this helpful and if you do please rate my assitance most people dont take the time let me know something thanks.



http://www.autozone.com/autozone/repairi... I am going to post this link you need to look at it. It will show you some components associated with vacume lokk at each vacume part and see if its in your jeep then follow those lines from that specific vacume part to the other end where they connectall the while looking for a cracked line or vacume leak.If you come across a part thats not in your jeep dont be alarmed your jeep may not be equipped with it.But the parts your jeep does have has vacume lines you need to check. There may also be a vacume routing diagram sticker under your hood if you can make sense of it it tells you where each vacume line goes to.On this link also when your looking at a vacume part some will will have an option that says replace if you click on that it should tell you location and how to replace it. I dont think they all will but believe most of them will.I hope you find this helpful and if you do please rate my assitance most people dont take the time let me know something thanks.

http://www.autozone.com/autozone/repairinfo/common/repairInfoMain.jsp?leftNavPage=productsHowTo&startLetter=V&targetPage=productSelected

Need to know if you have a check engine light on or malfunction indicater light on if so cuold you have the codes extracted and let me know what they are. Need to know if you have a check engine light on or malfunction indicater light on if so cuold you have the codes extracted and let me know what they are.

it is taking too much air in and stated before. It is hard to find a leak when the engine is running I know. Check ALL vacuum lines is all you can do and switched that have kines going to the. Any switch or part can have a crack in it too it is taking too much air in and stated before. It is hard to find a leak when the engine is running I know. Check ALL vacuum lines is all you can do and switched that have kines going to the. Any switch or part can have a crack in it too

Replace all the vacuum lines under the hood. Only vacuum lines. If it is a vacuum hose it will be hollow so that air can pass through the hose. Just look at the lines and disconnect one of each size. Cut off a small piece of the line about 1" and then reconnect it. Look at all other lines and then do the same thing with lines that are a different size. Estimate the total length of the lines in each size and then carry the piece with you and purchase enough line of each size to replace them all. Be sure to buy enough. These vacuum lines are cheap so buy plenty. Be sure and replace the booster line, which is not cheap, so measure that one and buy only what you need. I wish I could be more specific, but without looking at the engine myself I cannot tell you where each line is. Warning: Replace the lines one at a time, as it is very easy to get confused and then you would have a mess trying to figure the routing out.


Replace all the vacuum lines under the hood. Only vacuum lines. If it is a vacuum hose it will be hollow so that air can pass through the hose. Just look at the lines and disconnect one of each size. Cut off a small piece of the line about 1" and then reconnect it. Look at all other lines and then do the same thing with lines that are a different size. Estimate the total length of the lines in each size and then carry the piece with you and purchase enough line of each size to replace them all. Be sure to buy enough. These vacuum lines are cheap so buy plenty. Be sure and replace the booster line, which is not cheap, so measure that one and buy only what you need. I wish I could be more specific, but without looking at the engine myself I cannot tell you where each line is. Warning: Replace the lines one at a time, as it is very easy to get confused and then you would have a mess trying to figure the routing out.

You may have multiple problems so you need to fix them one at a time and then go from there. You have replaced the brake booster, so now replaced the vacuum lines and see where you stand. You may have multiple problems so you need to fix them one at a time and then go from there. You have replaced the brake booster, so now replaced the vacuum lines and see where you stand.