WHEN I PUSH ON THE BRAKE PEDAL ON OUR 1996 GRAND CHEROKEE , AIR LEAKS... BRAKE PEDAL IS TO THE FLOOR WITH NO BRAKING ABILITY. ANY IDEAS ?
2007-09-15 10:35:58 · 7 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
it is definatley air coming out. i can feel it right there where the arm goes from the pedal through the firewall. as far as fluid leaks go, I can't find any and the resevoir is full.
2007-09-15 13:23:17 · update #1
I pulled the vacume hose off the booster and the pedal got hard and no vacume sound by the pedal after that. any ideas ?
2007-09-15 14:04:59 · update #2
and it is a vacum drawing air in at the point where the arm goes in, and not air escaping.
2007-09-15 14:09:57 · update #3
Thepedal will only go to the floor if there is a leak in the hydraulic (brake) system.
The power booster has a rubber membrane in it that can in time fail but htis rarely happens.
What your hearing is the constant vacuum noise form the booster since your foot is going ot the floor and not stopping at the typical shorter interval since there is a fluid leak somewhere in your brake lines or brake cylinder or hose or caliper or master cylinder.
Check for a fluid leak and don't worry too much about that sucking noise as it should go away once the brakes (leak) are fixed.
Good Luck!
2007-09-15 10:57:53 · answer #1 · answered by CactiJoe 7 · 0⤊ 0⤋
if it were the booster chuck the pedal would be hard as a rock. Next there is no such thing as an in leak in your hydraulic brake system. The air you hear is either trapped in the system, making a squinching sound. You have a rupture in the line and you are getting air in the brake system. Repair the leak, and gravity bleed the brakes first. That is, open all of the bleeder screws and let them bleed themselves. You have to monitor the brake fluid level though, because if it gets too low, you will introduce air back into the system. My advice is to let them gravity bleed for about an hour. Then, close all the bleeders and bleed all of the brakes using the pressure method, starting with the right rear , then the left rear, then the right front then the left front. that should take care of it.
2007-09-15 10:50:27 · answer #2 · answered by skid 4 · 1⤊ 0⤋
air leak would be a busted diaphram in the booster, but i have always seen a bad booster cause a VERY hard brake pedal. pedal to the floor and no brakes sounds like a huge air bubble (broken line maybe?) or a bad master cylinder.
take a pair of needle nose vice grips and pinch off the big (3/8) vac line to the booster and try it again. if you lose the air noise then you can say the booster is bad.
still kinda baffles me about the pedal going to the floor.check fluid levels and each wheel for fluid leaks. may end up putting a master cyl on it too....
2007-09-15 10:50:06 · answer #3 · answered by chevy_man_rob 5 · 1⤊ 0⤋
Replace your master brake cylinder which is bolted to the big flying saucer vacuum assist in front of the driver's side window in the engine compartment on the firewall.
2007-09-15 11:02:35 · answer #4 · answered by bobweb 7 · 0⤊ 0⤋
a trouble-free volume of Cherokees of this classic have the very situation you're describing right here. frequently this is a failure interior the windshield seal. fortuitously it is likewise frequently an ordinary and much less high priced restoration. Take a run down on your interior of sight motor vehicle glass save and characteristic them verify it out. an ordinary reseal will remedy the concern in maximum circumstances.
2016-11-14 13:02:55 · answer #5 · answered by serpa 4 · 0⤊ 0⤋
There is a vacuum line going into the booster. It can come out. Check that first. Then its probably the booster.
2007-09-15 10:46:57 · answer #6 · answered by JES 6 · 0⤊ 1⤋
Power booster is most likely the culprit.
2007-09-15 10:40:33 · answer #7 · answered by chuckman4112 2 · 0⤊ 1⤋