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Changed master 3x's portion vavle and crusie control vavle no leaks to be found help

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That's good; you don't want any leaks. Are you having some other problem?

Posted on Oct 03, 2010

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Posted on Jan 02, 2017

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My cruise control doesnt work anymore checked fuse and changed it still dont work


Take it , it does not set . ? only sets when driving over about 35.
turned on light indicates on in cluster OK.. but will not set, right.??
Dealers go nuts with this one. give them a try.
brake switch on brake peddle arm often fail and go out of ajustment.

Next is big money unit under the hood. Cheaper to bye after market system..

check brake peddle cut out .switch .
sw has 2 functions: brake lights off when at rest and on for crusie. remove connector. check out the switch.. the sw tabs often fail. tierap helps. or replace switch $ 20. item any local parts store.
ajusted on install.

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I am having a problem with bleeding the brakes. The truck has a proportion vavle for the rearend, maybe the first type of ABS? I'm not to sure. I can bleed the brakes starting with the rear-end and working...


mcdevito75 here, You have a dual chamber master cylinder sounds like 1 of those cahmbers the rear one is faulty, the master cylinder is most likeky the main prblem, specially if this was happening slowly. Try to re-bleed in this sequense left front, right front, left rear, right rear make sure the stream of fluid is solid, no spurting at the bleeder, and keep the master cylinder full when bleeding, if you let the master cylinder go to low while bleeding your only sucking in more air.

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Crusie control doesn''t work


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2002 jeep cherakee crusie control and heater


sounds like you have a vacuum leak somewhere or a faulty check valve. the air control and speed control are both vacuum operated. check for cracked vacuum hoses under the hood. The Jeeps also ran a check valve either near the intake manifold or near the a/c and heater core lines where they enter through the firewall or some had both. to check the valve, remove from the lines and try to blow through both sides. should only allow air to flow through from one side. if you remove pay attention to how it was installed so you can reinstall in the correct direction

Jan 08, 2010 | 1995 Jeep Grand Cherokee

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Experienceing loss of power to brakes


1. What is the Brake Fluid Level?
2. Are you losing any Brake fluid at all? Are there any puddles or noticeable wetness on the ground or on the tires/wheels? With vehicle parked, the reservoir filled (overfilled), and engine running: pump the brakes and check on the ground and back sides (inside portions) of the wheels. Look for any brake fluid leaks.
3. Leaks from Calipers usually means a leak from the caliper piston. The rubber seals will be wet.
Leaks from Drums usually means a leak from the wheel cylinder.
4. In any case of leaks from the wheels - replace the calliper OR wheel cylinder.
For caliper leaks: change the brake pads, and clean the rotors with brake cleaner.
For drum leaks: clean the drum and brake hardware with brake cleaner, and replace the shoes.
5. If no leak is detected from the wheel area's: check under the Master Cylinder for wetness indicating a possible leak.
6. If no leak can be found: you MAY have a rear seal leak in the Master Cylinder which is pumping Brake Fluid into the Brake Booster (that large disk looking thing attached to the fire wall, attached to the Master Cylinder in front).
a. Use a large drip/catch pan under the Van in the area on the Master Cylinder.
b. Disconnect the brake lines from the Master Cylinder using a flair wrench.
c. Remove the two nuts (12 or 13mm?) attaching the Master Cylinder to the Brake Booster. If you have been using a lot of fluid, and have found no leaks, here is a good possibilty that all that brake fluid has collected in the Booster; so when you detach the Master Cylinder from the Brake Booster, all that fluid will come rushing out!
7. If there is Brake Fluid inside the Brake Booster: there is no cleaning that out. Brake Fluid is very caustic to the seals inside the Booster and should be replaced.
8. Of course the Master Cylinder will also have to be replaced.
9. After replacing the Master Cylinder/Brake Booster - make sure you get all that spilled brake fluid off the engine compartment area parts! I use a brake cleaner, then mild soap and then water to rinse. Clean any Brake Fluid off Paint imediatley as it will quickly dissolves finishes and paint.
10. If no leak is detected and the Booster is clear, there may be problems with the Booster One-Way Valve. This is attached to the outside of the Booster and has a hose from an "advance" connected to it. This maybe malfunctioning where you are losing power. Replace this first before deciding to replace the whole booster (in cases of NON-LEAKS ONLY). If that did not work, there may be inner seals inside the Booster that have failed. That means a new Booster.
11. In any of the above cases: Make sure you bleed the Master Cylinder correctly and bleed the brakes (at each affected wheel) correctly. Any air in the brake lines will decrease your braking proficiency or could result in brake failure.

Let me know if this helped or if you have any additional information or questions. Feel free to contact me at FixYa.com!

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alot of new cars cannot be bleed correctly without a scanner to open the valve in the ABS motor. You may have to have a shop perform this job

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Apr 16, 2009 | Ford Super Duty Cars & Trucks

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CRUSIE CONTROL DONT WORK 1993 LS 400


check brake fluid level.if to low cruise will not work. also check all fuses.

Jan 07, 2009 | 1993 Lexus Ls 400

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