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1990 jeep wrangler bleeding breaks

Can not get air out of breaks

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  • Jeep Master
  • 17,970 Answers

Hi there:
I suggest to check this procedure, when the hydraulic brake system must be bled whenever a fluid line has been disconnected because air gets into the system.

A leak in the system may sometimes be indicated by a spongy brake pedal. Air trapped in the system is compressible and does not permit the pressure applied to the brake pedal to be transmitted solidly through the brakes. The system must be absolutely free from air at all times. If the master cylinder has been overhauled or a new cylinder has been installed, bleed the cylinder on a bench before installation. When bleeding brakes, bleed at the wheel most distant from the master cylinder first, the next most distant second, and so on. During the bleeding operation the master cylinder must be kept at least 3 / 4 full of brake fluid.


The ABS bleeding procedure is different from the conventional method. It consists of the following three steps:
Step 1: Conventional manual brake bleed.
Step 2: Bleeding the system using the DRB scan tool.
Step 3: An additional conventional manual brake bleed.

The recommended ABS bleeding procedure is as follows:

  1. To bleed the brakes, first carefully clean all dirt from around the master cylinder filler cap. Remove the filler cap and fill the master cylinder with DOT 3 brake fluid to the lower edge of the filler neck.
  2. Bleed the master cylinder first. Have a helper operate the brake pedal while bleeding each master cylinder fluid outlet line. Do not allow the master cylinder to to run out of fluid,as this will allow additional air to be drawn into the cylinder.
  3. Bleed the brake system in the following sequence:
    1. Master cylinder
    2. HCU valve body (at fluid lines)
    3. Right rear wheel
    4. Left rear wheel
    5. Right front wheel
    6. Left front wheel
  4. Clean off the bleeder connections at all four wheel cylinders. Attach the bleeder hose to the right rear wheel cylinder bleeder screw and place the end of the tube in a glass jar, submerged in brake fluid.
  5. Open the bleeder valve 1/2 - 3/4 of a turn.
  6. Have an assistant depress the brake pedal slowly and allow it to return. Continue this pumping action to force any air out of the system. When bubbles cease to appear at the end of the bleeder hose, close the bleeder valve and remove the hose.
  7. Check the level of fluid in the master cylinder reservoir and replenish as necessary.
  8. After the bleeding operation at each wheel cylinder has been completed, fill the master cylinder reservoir and replace the filler plug.

Do not reuse the fluid which has been removed from the lines through the bleeding process because it contains air bubbles and dirt.


  1. Perform the "Bleed Brake'' procedure with the DRB II scan tool. This procedure is described in the DRB II software information and diagnostic guide.
    1. Attach the DRB II scan tool to the diagnostic connector.
    2. Run the Bleed Brake procedure as described in the DRB II tester guide.
  2. Repeat the conventional bleeding procedure as previously outlined.
  3. Fill the master cylinder reservoir to the proper level.
  4. Check the brake operation.


Hope this helps.

Posted on Apr 30, 2013

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 1990 jeep wranger slave cyclinder

The clutch slave cylinder on this model is located inside the transmission bell housing. You would have to pull the tranny to see it.
Bleeding the slave cylinder is a fairly simple process.
Underneath the vehicle on the driver side you will see two hydraulic lines going into the transmission where the tranny connects to the engine. If you have trouble locating just follow the hydraulic line from the master cylinder on the firewall.
One of these lines is actually sticking out of the tranny and has a bleeder valve on the end.
You will need a 9/16 box end wrench and a 5/16 or 1/4 inch box end wrench and someone with you to press the clutch pedal while you are under the vehicle.

1. Top off the master cylinder with clean brake fluid. Also, MAKE SURE you keep the fluid level in the master cylinder topped off during this process. You may need to have a second helper to take care of this so you don't have to keep climbing out from underneath.

2.Hold the line with the 9/16 and loosen the bleeder valve a couple turns or until fluid begins to drain. Have someone SLOWLY depress the clutch pedal to the floor and hold it down to the floor until you tighten the bleeder valve back up. MAKE SURE YOU ARE OUT OF THE WAY OF THE SQUIRTING FLUID WHEN THE PEDAL IS DEPRESSED!!

3. Once you are sure the valve is tight, have them pump the clutch pedal a couple times . Repeat step two until the pedal has a full stroke.

Posted on Jan 23, 2009

  • 6982 Answers

SOURCE: 1990 wrangler all new slave cylinder, pressure

If you have had the flywheel cut, have a clutch with a different release height (different finger or diaphram design & height) or a remanufactured pressure plate, or all of the above, you may run into this problem.
Small differences there translate to a large difference at the pedal. On linkage type designs, there were several options including longer/shorter throwout bearing or adjustable fork pivot ball. Hydraulic systems should compensate somewhat, but if you are beyond the travel of the slave cyl, I'm not sure there is anything you can do from the outside. I would check that there are no air leaks. If you have an external slave cylinder you may be able to make a slightly longer rod that connects the slave to the clutch fork. I really can't think of anything else to do at this point.
Hope this helps a bit.

Posted on Apr 19, 2009

  • 14036 Answers

SOURCE: Trouble Bleeding Break Line

you need to hold in the metering valve.when you bleed the front brakes.long as the valve closed off you wont be able to bleed front brakes.better to get extra help.hard to bleed by your self .

Posted on Apr 20, 2009

bigc73542
  • 108 Answers

SOURCE: Jeep Wrangler 6 cyl. idles up and down

Have your oxygen sensor checked, one of the symptoms of a faulty oxygen is an up and down idle.

Posted on May 04, 2009

redbeard00
  • 957 Answers

SOURCE: how do i bleed the master clutch cylinder system on a 1995 jeep ?

A special pump is used to back bleed the system. If you don't own one then you have to be patient and just keep pumping the clutch pedal until it comes back. It can take a half hour to get it back. Just depents on how much air is inside.

Posted on Jun 16, 2009

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1 Answer

Hydraulic throwout bearing


it is dirty brake fluid that squirts out bleed it until clean fluid come threw

Sep 02, 2012 | 1990 Jeep Wrangler

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1990 jeep wrangler just got all new master/slave cylinder pressureplate piolt bearing or throughout bearing / had flywheel refaced had pedal frst time engaded and second time no pedal and third time had...


You have to bleed it at the slave cylinder not the master cylinder.Keep the bottle on the m/cyl full at all times and do not disconnect any lines.Bleed the system at the sl/cyl.Then do it again after a short drive.You still have air in the system.If you take off any m/cyl lines,you have to start all over again.
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Where do I bleed the brtakes on A 1992 WRANGLER


If it's a 5 speed, under the passenger side in front of the base plate, there is a small nipple looks like the one for bleeding breaks, it pokes out of the front bell of the transmission. Bleed it like breaks, have someone push on the clutch, and hold, you open and let out the air, close have them let up, repeat until air is out.

Sep 15, 2010 | 1992 Jeep Wrangler

1 Answer

I have to pump the clutch to get into any gear. Where is the clutch reservoir and from where would I bleed the clutch?


Master is on the firewall next to the brake master. Bleed valve should be on the slave on the bellhousing. If it was working and now feels low or in need of bleeding likely you have air in the system but that cannot get there unless there is a leak. Carefully inspect the master (often leaks into the passenger compartment where the rod from the pedal goes through the firewall) as well as the line and slave. If you find seepage anywhere, replace that part.

May 15, 2010 | 1990 Jeep Wrangler

2 Answers

Where is the bleed valve for clutch on a 1991 jeep wrangler


1. Fill master cylinder reservoir with DOT 3 brake fluid. Raise and support vehicle. Attach bleeder hose to bleeder screw on bleed line of slave cylinder. See Fig. 1 (attached in link) . Place other end of hose in glass container 1/2 full of brake fluid. Loosen bleeder screw while holding bleeder screw fitting.

2. Have an assistant depress clutch pedal to the floor. Tighten bleeder screw and release clutch pedal. Repeat bleeding procedure until fluid entering container is free of bubbles. DO NOT allow reservoir to run out of fluid during bleeding. Refill clutch master cylinder reservoir.

CAUTION: DO NOT allow bleed line to bend or flex when loosening
bleeder screw.

FIG1: http://anubiscycle.com/fixya/91wranglerslaveassy.png

Jan 14, 2010 | 1991 Jeep Wrangler

1 Answer

Just put a set of rear brakes on my 1990 jeep wrangler an i still have no pedal presure


it sounds like you need to bleed the brakes. If the pedal will not pump up to bleed the brakes then you must have bad master cylinder. We just had the same problem with my wifes truck. Her brakes went to the floor and would not pump up. It was the master cylinder.

Oct 15, 2009 | 1990 Jeep Wrangler

4 Answers

Is there a way to adjust a clutch on a 1990 jeep


On the clutch cable, you will see an adjustment nut, Turn right to tighten and left to loosen.

Aug 02, 2009 | 1990 Jeep Wrangler

1 Answer

1990 wrangler all new slave cylinder, pressure plate,clutch,flywheel,master cylinder,only have 2 inch of pedal,after bleeding.Is there away to bleed system I dont know about.


If you have had the flywheel cut, have a clutch with a different release height (different finger or diaphram design & height) or a remanufactured pressure plate, or all of the above, you may run into this problem.
Small differences there translate to a large difference at the pedal. On linkage type designs, there were several options including longer/shorter throwout bearing or adjustable fork pivot ball. Hydraulic systems should compensate somewhat, but if you are beyond the travel of the slave cyl, I'm not sure there is anything you can do from the outside. I would check that there are no air leaks. If you have an external slave cylinder you may be able to make a slightly longer rod that connects the slave to the clutch fork. I really can't think of anything else to do at this point.
Hope this helps a bit.

Apr 19, 2009 | 1990 Jeep Wrangler

1 Answer

Clutch


Bleeder screw should be somewhere on the slave cylinder, generally somewhere above the centerline of the unit. (unless someone snapped it off. If that's the case, sometimes you can drill it out, but this takes a lot of skill mixed with some luck. (You can't damage the threads at all, and if you go too deep you will damage the sealing surface). Therefore better to replace it.

Jan 02, 2009 | 1990 Jeep Wrangler

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