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What would cause air to bubble up in 1 resevoir of the master cylinder?

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Somewhere in your system you have a air leak

Posted on Oct 03, 2010

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How to bleed 2004 pontiac sunfire slave cylinder


There are 2 ways to bleed the clutch slave cylinder on any vehcile really. First way is to have a person in the car pump the clutch pedal several times and hold it to the floor. While the person holds the clutch pedal to the floor a second person opens the bleeder screw on the slave cylinder itself, once the air/fluid has stopped running out of the bleeder screw, tighten it again and have the first person in the car pull up on clutch pedal from the floor (because it will stick down after openening and tightening the bleeder screw) and then repeat that process until the clutch pedal feels good and hard. Make sure you fill the fluid in the clutch master resevoir each time you open and close the bleeder screw so you don't get new air coming through the system from emptying the resevoir.

Now, the second way is the way I prefer because you only need 1 person, however you do need more tools. Fill the clutch master resevoir will the proper fluid then find a cap that fits the resevoir or buy a replacement cap and drill a small 1/8" hole in the middle of the cap then use a vacuum pump and insert a rubber adapter (from the vacuum pump kit) into the 1/8th hole you have drilled. you'll want to hook up your vacuum pump with an inline catch tank that usually comes with the kit you purchase. Then just pump the tool creating a vacuum in the master resevoir, this will reverse bleed all the air up into the resevoir. as you see the fluid drop add more fluid and repeat this process until the fluid no longer drops. Check the clutch pedal for proper opperation and you're good to go!

Jul 23, 2014 | 2004 Pontiac Sunfire

1 Answer

Break line broke replaced no leaks can't get break paddle99 Chevy


Sounds like you may have an air bubble in the master cylinder. The most effective way to deal with that is getting a master cylinder bleeder kit from your local parts store - make sure it has the metal clips that will hold the hoses in the master cylinder. Install line adapters after removing brake lines from the master. top up the fluid in the master and install hose clips, making sure the end of the hoses are in the brake fluid at least 1 inch. Slowly pump the brake pedal, making sure you bottom out the pedal and release SLOWLY so you don\'t suck air into the hoses - have a helper watch the fluid level in the master cylinder and the bubble production. The fluid level should not sink during this procedure - if it does, then you may have a faulty master cylinder. Pump until you have no more bubbles. If the bubbles don\'t stop, then you have a faulty master cylinder.

Hope this helps!!

Dec 01, 2013 | 1995 Chevrolet K1500

1 Answer

I have a 1988 f350 diesel i replaced the clutch master cylinder and the slave cylinder bled the lines and the truck still wont go in gear the throw out arm is moving about 1/2 inch what could be my prob


Ford has special bleeding and blocking instructions for clutch slave. Check manual for proper bleeding requirements. May consider presurre bleeding of master cylinder or use master cyclinder bleeding tubes that fill the resevoir as you bleed the and remove all air in system.

Jan 21, 2013 | Cars & Trucks

1 Answer

Have no pedal. tried bleeding brakes.works well for a day or two.then no pedal again.replaced master cylinder. worked great for about a week then suddenly went to floor again. all lines seem to be air


When you replaced the master cylinder, did you bleed it before you hooked it up? It not then you will have to take it back off and bleed it first. Fill it with fluid and pump the plunger in and out until there is absolutely no air bubbles. you can get a couple short pieces of brake line and bend them so the fluid drains out of the cylinder and back in the resevoir. Just make sure to work slowly so the air bubbles go away before they get back into the cylinder.

Make sure your brake lines are tight on the master, a little looseness will let the system **** air back in. Also make sure they have the same kind of end. some are "bubble flared" and some are "double flared" and they can not be interchanged. Also make sure your bleeder screws at the wheels are tight.

If this doesn't help then I would pull the wheels and check the wheel cylinders to see if any of them are leaking, also the front calipers. Hope this helps.

Nov 12, 2011 | Cars & Trucks

1 Answer

Have bled brakes after replacing 2 lines, wheel cylinders,master cylinder and pedal goes way down when truck is running


Make sure the rear brakes are adjusted up first. Often times it helps to let the system "gravity bleed" for a while. Open the bleeder screws and let gravity do the rest. Keep the master filled up and catch the run off at the wheel.Let it bleed until the fluid runs steady in a clear stream. This will remove most of the air in the system. Then you can do the "pump the pedal" thing.

Did you " bench bleed" the master cylinder before you put it on the truck? If not, do it now. Simply remove the brake lines from the master and replace them with short open lines to a bucket or even back into the master. Fill the resevoir and pump the cylinder until there are absolutely no bubbles coming out of the short lines. Then reattach the brake lines and start all over with the bleeding process. Hope this helps.

Sep 25, 2011 | 1995 Chevrolet K1500

1 Answer

Clutch is long and softer than usual, burning smell, master cylinder, back plate, and cluth replaced six months ago. but problem didnt go away. also when starting to drive i have to accelerate more than...


Possibly air in the line. There will be a bleeder screw on the slave cylinder. Fill reservoir. Put a hose on the bleeder screw. Loosen the screw. Place the other end of the hose in a clear bottle of brake fluid. Pump the clutch until no more bubbles come out of the hose. Tighten the bleeder, and fill the resevoir again.

Aug 31, 2010 | Toyota 4Runner Cars & Trucks

2 Answers

How do you bleed brakes on 2002 toyota camray. should the car be running


Engine should be off.
Take off one wheel at a time.
Connect a Mity Vacuum pump to the bleed valve.
Start to pump.
The air bubbles can be seen wen the fluid flowing out.
Constantly check the level in the master container to fill in with the new brake fluid so air doesn't get in the master cylinder.
Keep pumping until the clear liquid come out without any air bubbles.
Repeat for all the wheels.c8e6ff4.jpg

Aug 06, 2010 | 2002 Toyota Camry

2 Answers

Hi. I have a 1990 Ford F350 diesel UHaul with no


when you replace the master cylinder, your are supposed to pump it up manually before you install it. If you don't, you'll have to sit there and pump the brake pedal a couple of thousand times as one almost microscopic air bubble at a time escapes the pressure tube and back fills with fluid. once you can push the pedal repeatedly without any bubbles escaping into the reservoir, then bleed the brakes. Starting with the farthest, usually the Right Rear and work your way up. Make sure you keep the fluid level topped off. If it sucks air once, you have to start all over.

Sep 23, 2009 | 1990 Ford F350

1 Answer

Changing 4 calipers and there is no oil com out when try to bleed


The master cylinder supplies the pressure to the brake fluid that travels between the maste brake cylinder resevoir and the brake caliper pistons (through the brake lines. If the master cylinder fails there will be insufficient compression of the brake fluid to make the calipers operate as designed. Leaks in the brake lines and/or cylinders is a possibility, and unrelated to functionality of the master cylinder. Also, pistons located in the brake calipers can form a corrosion ring on their inside walls if there is breakdown in the brake fluid or moisture that gets into the lines. Operating the vehicle when there is insufficient brake fluid in the master cylinder resevoir can also lead to air getting into the brake lines, causing bad working brakes. Air compresses more than brake fluid, and the master cylinder isn't designed to compress air in the brake lines. Sounds like a bad case of "lack of maintenance", as opposed to bad advice from the mechanics. That said, there's no excuse for bad installation. But, it's tough to improperly install a brake line since they are nothing more than hollow metal tubes. There should be no rubber connectors installed in the brake lines. When bleeding the brake lines one must remove all of the trapped air before you will see any fluid appear. If the valves in the master cylinder are not properly operating the master cylinder will not allow the brake fluid to get into the brake lines.

Hope this helps.

Jun 13, 2009 | 1999 Volkswagen Passat

2 Answers

Replaced master cylinder


bleed system of all air. easiest way is get a glass jar fill it some with brake fluid for no air .. (air bubbles fluid is sucked in when pumping) with 1 hose dipped in fluid in glass jar

Aug 01, 2008 | 1991 Honda Civic

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