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Sellick forklift I believe I have a hydraulic bypass problem in one of the cylinders on a Sellick at work. When the oil gets hot, The brake pedal goes all the way to the floor. Why would hot oil cause this?

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6ya6ya
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Posted on Jan 02, 2017

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  • 7 Answers

SOURCE: 2001 Mustang GT rear brake job

yep this is a two man job, onece you get air in the lines is better to do all four, my has abs and i was able to do it, but next time don't take anylines lose just turn the piston clockwise and you should be able to push it in.

Posted on Oct 12, 2008

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SOURCE: 1998 chevy s10- brake pedal goes to the floor-

Did you put fresh fluid in the master cylinder? I really think you still have air in the lines. To bleed manually, start with the bleeder the greatest distance from the master cylinder, car running, helper pushing down about half way on brake pedal and releasing 3 times, on 3rd time, holding pedal down to half way depressed point while you open the bleeder valve. Repeat until you are sure all air has been flushed out. Check master cyl reservoir level often, because if it gets low and you **** air into the system, you have to start all over again. Go to wheel next greatest distance from master cyl, repeat above, working your way to wheel closest to master cyl last.

Posted on Apr 12, 2009

redbeard00
  • 957 Answers

SOURCE: just replaced master cylinder on 1990 aerostar and bled the brakes, still the pedal goes to floor and i have no brakes

Did you bench bleed the master cyl. before installing it? then when you installed the new master, did you bleed all 4 points? If yes, then check all for points for leaking caliper/s and leaking wheel cylinder/s. If the van has ABS, check the valve body for a bleeder screw and see if air bleeds out of it. If you've checked everything twice and did everything right then your new master cyl. may be defective.

Posted on Apr 29, 2009

  • 8 Answers

SOURCE: brake pedal goes to floor

there is still air in your hydraulic lines somewhere bleed the system with a pressurised power bleeder and you will get instant results

Posted on May 01, 2009

  • 109 Answers

SOURCE: Brake pedal goes down to floor. Putting brake fluid doesn't solve problem. Vehicle must coast to a complete stop.

First look for obvious leaks under the vehicle, especially the inside area of each wheel... If you see fluid, you have either a blown cylinder seal or a bad line (check the rubber hoses to the front and back brakes too) Repair the offending part and bleed the air out of the system... (remember to clean pads or shoes if they have fluid on them)... If you see no hint of leakage anywhere, then suspect the master cylinder... if you remove the master cylinder, check and make sure that it didn't leak fluid into the brake booster diaphragm (Brake fluid will destroy the booster)... as in any repair when you open the system (lose fluid), you will need to bleed out the air to restore function... hope this helps...;-)

Posted on May 04, 2009

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I have an 01 GMC Jimmy 4.3L 4WD & we are trying to bleed the brakes but the scanner says my vehicle is going 3MPH so we manually bleed the brakes but the pedals still easily is pushed to the floor.


Bad master cylinder . What are you using a scan tool for ? No need Unless your Installing a new Electro-Hydraulic Control Unit (EHCU) or new Brake Pressure Modulator Valve (BPMV).
Hydraulic Brake System Bleeding (Manual)
Caution: Refer to Brake Fluid Irritant Caution in the Preface section.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.
Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.
With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve.
If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, you must perform the following steps:
3.1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If necessary add GM approved brake fluid from a clean, sealed brake fluid container. Refer to Fluid and Lubricant Recommendations.
If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal.
3.2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder.
3.3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder.
3.4. Reconnect the brake pipe to the master cylinder port and tighten securely.
3.5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
3.6. Loosen the same brake pipe to purge air from the open port of the master cylinder.
3.7. Tighten the brake pipe, then have the assistant slowly release the brake pedal.
3.8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the master cylinder.
3.9. With the front brake pipe installed securely to the master cylinder, after all air has been purged from the front port of the master cylinder, loosen and separate the rear brake pipe from the master cylinder, then repeat steps 3.3-3.8.
3.10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened.
Fill the brake master cylinder reservoir with GM approved brake fluid from a clean, sealed brake fluid container. Ensure that the brake master cylinder reservoir remains at least half-full during this bleeding procedure. Add fluid as needed to maintain the proper level.
Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve.
Submerge the open end of the transparent hose into a transparent container partially filled with GM approved brake fluid from a clean, sealed brake fluid container.
Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
Loosen the bleeder valve to purge air from the wheel hydraulic circuit.
Tighten the bleeder valve, then have the assistant slowly release the brake pedal.
Wait 15 seconds, then repeat steps 8-10 until all air is purged from the same wheel hydraulic circuit.
With the right rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right rear hydraulic circuit install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
With the left rear wheel hydraulic circuit bleeder valve tightened securely, after all air purged from the left rear hydraulic circuit, install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
With the right front wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right front hydraulic circuit, install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened.
Fill the brake master cylinder reservoir to the maximum-fill level with GM approved brake fluid from a clean, sealed brake fluid container.
Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
If the brake pedal feels spongy, repeat the bleeding procedure again. If the brake pedal still feels spongy after repeating the bleeding procedure, perform the following steps:
21.1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection.
21.2. Pressure bleed the hydraulic brake system in order to purge any air that may still be trapped in the system.
Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
Important: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes

Feb 26, 2017 | GMC Cars & Trucks

1 Answer

How to diagnose whether the clutch master or slave cylinder is my problem on 2002 ford focus 2.0 liter.Clutch pedal goes to the floor with no resistance.Brake master has fluid.


could be either
the problem is air in the hydraulic system either form a leaking slave cylinder or a faulty master cylinder admitting air on application or bypassing oil on application
you have to first check that it is hydraulic operation as the brake master cylinder may have fluid but that is a separate system to the clutch
check that it is not cable operation in which case it will be a broken cable
after the simple check , if it is a hydraulic system , replace both slave and master cylinder as they both wear out together and if it is cable replace the cable

Nov 11, 2016 | Ford Cars & Trucks

1 Answer

No brake peddle after changing passenger side brake pedal


If you mean changing your brake pads, you may have a frozen pad in bracket therefore creating "no pedal" feel. If any hydraulic line or hose leaked then needs repaired and air "bled" out of system. That could cause no pedal. Bypass in master cylinder could cause no pedal.

Mar 04, 2014 | 2008 Chevrolet Malibu

1 Answer

I need to bleed the hydraulic clutch system


Your hydraulic clutch system is a wonderful smoothly operating method of engaging and disengaging the engine from the transmission. Most of the time. However, should you ever find the need to expel air from this hydraulic line...you may in for a long tedious experience.

I recently had to replace the master cylinder of my hydraulic clutch system. This was easily done as it comprised only one fluid line..and two bolts. Once the new master cylinder was mounted however, I found that air had gotten into the line..and adamantly refused to leave.

I undertook all of the common methods of removing this air but to no avail. I tried bleeding the system from the slave cylinder. I tried opening and closing the bleeder valve at the slave cylinder while someone pumped the clutch pedal for me. I tried using a vacuum pump to pull fluid and air out of the system. Each and every effort failed.

Air in a hydraulic line is a for certain way to insure that the hydraulic function will NOT occur. Air is compressible. A fluid is not. So when you place you foot on a brake pedal, or a clutch pedal and apply pressure, the non-compressing nature of that fluid, allows that fluid to behave as if there was an actual physical link in action. As an example..if there was a steel bar attached to your brake pedal..that would activate the brakes when you stepped on the brake pedal...that bar would be an actual, physical, material link..from pedal to brake shoe. A hydraulic line is very similar. When you step on the pedal..there is a force applied to the brakes..by the non compressing nature of the fluid..within that line...the force applied on that pedal, is instantly applied at the other end of that line...unless..there is air trapped within that line. The air will compress..stealing energy..and will not transmit the force applied.

I did a great deal of searching online trying to find a method of removing this air from my hydraulic clutch system and discovered some of what was causing the problem. The Bore of the piston inside the master cylinder is small...and the stroke or forward movement of that piston..is rather short. There just wasn't enough movement of fluid going on to force the air out of the system in a reasonable amount of time. But my search did bare fruit finally..I found a wonderful article on refilling a hydraulic clutch system..that eliminates air, takes only a very few minutes and is not at all expensive.

What you need is one of those oil cans that has a spout and a trigger that will squirt the oil for you. This trigger...should be of the type that requires your index and middle fingers to operate as opposed to a can that has a thumb trigger. You will also need a length of clear plastic tubing that will fit snugly over the end of the oil can's spout..and will also fit snugly over the end of the disconnected fluid line at the slave cylinder.

In practice..it's very easy. Remove the fluid line from the slave cylinder and allow the system to bleed out entirely. While that is going on, fill your oil can with fresh clean brake fluid. Attach the tubing to the spout..and once the system has bled out..attach the other end of the tubing to the fluid line. Start pumping...just regular timed pumps are needed. Not too fast. This fluid, coming in from the bottom..fills the system from the bottom..UP..and pushes any air right out through the master cylinder. Take a peek at the master cylinder every now and again. When you see it beginning to fill with fluid...go ahead and fill it completely with brake fluid. Slip under the vehicle, re-connect the fluid line, pop open the bleeder on the slave cylinder..watch for fluid to come out...tighten the bleeder close again..and you are finished.

Oct 20, 2012 | 2005 Fiat Doblo 1.9

1 Answer

2004 holdern rodeo v6 clutch went to the floor was working all good before


The problem could come from the clutch master cylinder or the slave cylinder. The cause could be external or internal.

First check the fluid level in the reservoir. The reservoir could be independent of the brake system or using the same.

If the level is too low, air may have entered in the line and the hydraulic compression is affected. So first, adjust the level in the reservoir using recommended oil. (normally brake oil is ok).

Check for any oil leak starting from the clutch pedal following hydraulic circuit up to the transmission.
Your vehicule should have two clutch cylinders: the master and the slave.
The master cylinder is operated by your clutch pedal, it's located under the dash, fixed to the firewall and connected to the hydraulic line on the other side of the firewall. Check for any leak on the carpet, under the carpet and near the hydraulic connection. Pumping the pedal making that verification could help to detect leak. Then follow the hydraulic line going to the slave cylinder attached to the transmission making a visual inspection for leaks.
If for any reason some air entered the circuit, the line could be purged from air bleeding the slave cyclinder as you do bleeding brake component.
If there is no air, no leak detected then it's probably an internal problem that you can't see. Remove the cap from the reservoir, depress the pedal. If the oil is moving in the reservoir then the master slave is probably bad otherwise I would suspect the slave.
I'm not an Isuzu technician.
Some other Gurus could complement or correct my saying.
Hope it will help
Dan

Dec 20, 2009 | 2004 Isuzu Rodeo

3 Answers

Pedal goes all the way to floor and still in gear


YOUR CLUTCH IS NOT DISENGAGING. THERE COULD BE A PROBLEM WITH THE CLUTCH MASTER/SLAVE. CHECK FOR ACTION AT THE SLAVE. ALSO, A BROKEN PRESSURE PLATE SPRING OR THROW-OUT BEARING CAN KEEP THE CLUTCH ENGAGED ALL THE TIME.

Sep 18, 2009 | 1994 Jeep Wrangler

1 Answer

Push down on clutch pedal can't get car into gear


Likely, you have a hydraulic clutch system. Check clutch master cylijnder for fluid and leakage, check hydraulic line and slave cylinder for leaks. If fluid low or empty, bleed as you would a brake wheel cylinder. If full,have someone work the clutch while you watch slave cylinder to make sure it is moving clutch fork. If system full and little or no movement, the master may be "bypassing" internally (replace) Also, check pedal mechanical linkage. Not often but sometimes these parts can break! Could also be athat clutch itself is worn, but this does not happen overnight and you would have noted slip long before this!

Dec 29, 2008 | 1993 Jeep Wrangler

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