Question about 2000 Jeep Cherokee

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Front brake calipers hanging up

Yeah, it's that late here too. To answer your question, yes he did bleed the brakes. I dont know how accurate this is, but someone told me there is something like a valve body that the lines run into, and it may be bad. Then i had someone tell me it could be the master cylinder since both front brakes are hanging up. Oh , and it all wheel disc brakes, and a four wheel drive. I've had it for about three years, it has eighty six thousand miles on it, and this is the first time i have had any big problems with it other than normal wear .

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I'll do more research on this tomorrow.
yes there is a valve body
yes it could be the master cylinder
and as odd as it seem both calipers could have failed at the same time. incidentally another issue would be that the brakes locked on. i presume he changed the pads AND the rotor(s).
as i said i'll do more research in the morning on it. i have to change both front rotors and pads on my van on wednesday... might even notice something then that may help you.
You didn't mention if this vehicle has abs brakes... if you have stop you will know whether you have them or not.

actually something else that has occured to me... when you apply the brakes is there any shaking or do you feel a pulsing in the brake pedal ?

Robert

Posted on Sep 09, 2008

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3 Answers

Is it possible to put the front calipers on the wrong side?


I don't know year--make--model?
I don't think you can put it on backwards? I can't picture it? On the brakes I've done, the caliper pistons are always on the inside.
Usually with abs systems, the hydraulic system should still work even if the abs has a problem. Check the master cylinder.

With abs, use proper procedures for bleeding and pressure release.

Mar 03, 2016 | Cars & Trucks

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Rear brakes dont seem to be grabbing both rotors are all rusty


undo the bleed nipple on a caliper housing and press on the brakes to see if brake fluid is getting to the caliper pistons
if no then check for a faulty proportioning valve in the brake line
if yes , replace both calipers as the pistons are seized in the housings

Dec 01, 2015 | Cars & Trucks

1 Answer

Front brakes calipers locking up ,new calipers ,new lines , new mc, whats left?


only one side.
until i bleed, what does that mean.? (we all know how to bleed all 5 ways) but why do you say that.
oddly unbleed brakes never lock, due to AIR in the system.
so only bled brakes lock, or work prefect.

this is hydralics 101.
if any caliper locks, it must Be blockage
so does it stay locked for at least 5min>? unsaid DURATION
if yes, this is childs play.
you have 1 person try to turn tire, its locked, and you take your
spanner to THAT line at the MC and CRACK it open
does it unlock, yes, mc bad, no then the flex hose is bad inside.
dang that was easy huh?
if the mc, locks that TOO is easy
the piston is inside is not retracting 100%
all brakes must back flow, or LOCK.
the piston has a port there.
so the person that put the MC on car did not read the FSM
that clearly stated how to adjust the push rod gap from
brake pedal to MC rear piston.
for sure.
see this drawing.
if the piston dont retract then it can not back flow and will LOCK.

http://static.howstuffworks.com/gif/master-brake3.jpg




Mar 23, 2014 | 1985 Jeep CJ7

1 Answer

Need to know procedure for bleeding brakes on1987 gmc s15 2.8 litre 4x4 front disc w/abs


MANUAL BLEEDING

For those of us who are not fortunate enough to have access to a power bleeding tool, the manual brake bleeding procedure will quite adequately remove air from the hydraulic system. The major difference between the pressure and manual bleeding procedures is that the manual method takes more time and will require help from an assistant. One person must depress the brake pedal, while another opens and closes the bleeder screws.

In addition to a length of clear neoprene bleeder hose, bleeder wrenches and a clear bleeder bottle (old plastic jar or drink bottle will suffice), bleeding late-model ABS systems may also require the use of one or more relatively inexpensive combination valve pressure bleeding tools (which are used to depress one or more valves in order to allow component/system bleeding). To fully bleed the late model ABS systems, a scan tool should also be used to run the system through functional tests.
  1. Clean the top of the master cylinder, remove the cover and fill the reservoirs with clean fluid. To prevent squirting fluid, and possibly damaging painted surfaces, install the cover during the procedure, but be sure to frequently check and top off the reservoirs with fresh fluid.
CAUTION Never reuse brake fluid which has been bled from the system.
  1. The master cylinder must be bled first if it is suspected to contain air. If the master cylinder was removed and bench bled before installation it must still be bled, but it should take less time and effort. Bleed the master cylinder as follows:
    1. Position a container under the master cylinder to catch the brake fluid.
WARNING Do not allow brake fluid to spill on or come in contact with the vehicle's finish as it will remove the paint. In case of a spill, immediately flush the area with water.
    1. Loosen the front brake line at the master cylinder and allow the fluid to flow from the front port.
    2. Have a friend depress the brake pedal slowly and hold (air and/or fluid should be expelled from the loose fitting). Tighten the line, then release the brake pedal and wait 15 seconds. Loosen the fitting and repeat until all air is removed from the master cylinder bore.
    3. When finished, tighten the line fitting to 20 ft. lbs. (5 Nm).
    4. Repeat the sequence at the master cylinder rear pipe fitting.
During the bleeding procedure, make sure your assistant does NOT release the brake pedal while a fitting is loosened or while a bleeder screw is opening. Air will be drawn back into the system.
  1. Check and refill the master cylinder reservoir.
Remember, if the reservoir is allowed to empty of fluid during the procedure, air will be drawn into the system and the bleeding procedure must be restarted at the master cylinder assembly.
  1. On late model ABS equipped vehicles, perform the special ABS procedures as described later in this section. On 4 wheel ABS systems the Brake Pressure Modulator Valve (BPMV) must be bled (if it has been replaced or if it is suspected to contain air) and on most Rear Wheel Anti-Lock (RWAL) systems the combination valve must be held open. In both cases, special combination valve depressor tools should be used during bleeding and a scan tool must be used for ABS function tests.
  1. If a single line or fitting was the only hydraulic line disconnected, then only the caliper(s) or wheel cylinder(s) affected by that line must be bled. If the master cylinder required bleeding, then all calipers and wheel cylinders must be bled in the proper sequence:
    1. Right rear
    2. Left rear
    3. Right front
    4. Left front
  2. Bleed the individual calipers or wheel cylinders as follows:
    1. Place a suitable wrench over the bleeder screw and attach a clear plastic hose over the screw end. Be sure the hose is seated snugly on the screw or you may be squirted with brake fluid.
Be very careful when bleeding wheel cylinders and brake calipers. The bleeder screws often rust in position and may easily break off if forced. Installing a new bleeder screw will often require removal of the component and may include overhaul or replacement of the wheel cylinder/caliper. To help prevent the possibility of breaking a bleeder screw, spray it with some penetrating oil before attempting to loosen it.
    1. Submerge the other end of the tube in a transparent container of clean brake fluid.
    2. Loosen the bleed screw, then have a friend apply the brake pedal slowly and hold. Tighten the bleed screw to 62 inch lbs. (7 Nm), release the brake pedal and wait 15 seconds. Repeat the sequence (including the 15 second pause) until all air is expelled from the caliper or cylinder.
    3. Tighten the bleeder screw to 62 inch lbs. (7 Nm) when finished.
  1. Check the pedal for a hard feeling with the engine not running. If the pedal is soft, repeat the bleeding procedure until a firm pedal is obtained.
  2. If the brake warning light is on, depress the brake pedal firmly. If there is no air in the system, the light will go out.
  3. After bleeding, make sure that a firm pedal is achieved before attempting to move the vehicle.

Hope helps (remember to rate this answer).

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1 Answer

How to replace front calipers on 04 dodge ram 1500


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3 Answers

Why would passenger front brake get hot?


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How do I remove the old front disk pads and replace them with new pads on a 1988 Mercury Grand Marquis? Marvin


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1 Answer

Front brake calipers hanging up


ok if it's both now then it may be another issue. does that vehicle have abs brakes ?
and yes they are sort of connected in a way... by hydaulic fluid (brake fluid) the thing is when one wheel develops a fluid loss instead of complete brake loss you would still have brakes in two wheels... diagonally across from each other.
i'm not questioning your husbands work... but did he bleed the air from the the system when he changed brake lines ?



sorry about the spelling... it's 3am here

Robert

Sep 09, 2008 | 2000 Jeep Cherokee

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