Question about 1995 Buick Riviera

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HAVE TO BLEED BRAKES EVERY TWO WEEKS....AIR GETS INTO SYSTEM........HAS HAD 2 NEW MASTER CYLINFERS

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  • Master
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You have a leak somewhere in the system, you must also be losing fluid. The only way air can get in is either the fluid level is so low that the master cylinder is pumping air, or you have a leak some where. If this work has been performed at a shop, you should get a different repair shop as they aren't checking the whole system to find the cause- or they aren't up to the job. [ This is very basic repair and should be no problem ].

Posted on Mar 17, 2011

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  • Master
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I'm suspecting someone is not correctly bleeding brakes. That is a closed system and if it works initially then gets spongy shortly after, a bleeder is not tight or you might have a split hose. I'd have a different source bleed the brakes.

Posted on Mar 17, 2011

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How do I bleed the brakes on a 2009 Pontiac G6?


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1998 nissan altima brakes to the floor


Still air in system, sounds like the master cylinder has ran dry during the bleeding process, pumping more air into system. The lines running to the rear brakes are long, so you must bleed the fluid out the bleed screw in the rear 10+ times each side. Bleed, bleed, and bleed some more, keep bleeding untill that pedal feels good.

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1990 jeep wrangler bleeding breaks


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.

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If you replaced the master cylinder, then yes, you would need to bleed the brakes, as you've introduced air into the system when you disconnected the lines from the original.

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I change my master cylinder for my brakes and now I have no brakes what could be my problem to that


you must have a lot of air in system. the brakes need bleed to let the air out of system. did you bench bleed the master cylinder before putting it on car ! if not thats why no brakes. to bench bleed a new master cylinder, put it in a vise. fill it full or the proper level of brake fluid. push on the plunger with a dowel or another object. pump it till all air is out of master cylinder, you can tell when no air. it will be all fluid coming out of cylinder. keep checking brake fluid in master cylinder.make sure you push plunger in all the way.when all air is gone replace on car. if you do not loose any fluid from the master cylinder lines, then you can replace it without having air in system. bleed each wheel if needed. good-day!

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Replaced both front calipers, rotors, and brakes. brakes, drums and cylinders on rear. we cant seem to be able to bleed all the air out of lines. we bled the mc with no improvments. how about the abs...


You need to bleed them accordin to manufactures specs. When. Bleedin abs u need scan tool to open valve because air gets trapped in there. There will be a certain order weather u have diagnal split or front rear split

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Installed new master cylinder and now getting low pressure to right rear and left front


OK.
You might have to bleed the brakes at the right rear and left front to build up pressure and get the air out of the system.

Also, did you 'bench bleed' the master cylinder? Manufacturers recommend and require that you do this in order to get any air out of the master cylinder before installing.

I hope I helped you.

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