Question about 2000 Pontiac Grand Prix

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Brakes loose pressure no leaks in lines - 2000 Pontiac Grand Prix

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(1) Hi, If you have drum brakes on rear you could check the wheel cylinders to make sure they are not leaking. (2) check the brake fluid to see if it has dropped below min if it has then you could have air in the sytem, (3) last thing now is the brake master cylinder faulty this is proberly the one.
Hope this helps you out.
George.

Posted on Jul 17, 2009

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Check master and wheel cylinder connections if OK bleed air out of brake lines

Posted on Jul 17, 2009

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Posted on Jan 02, 2017

cwbtat
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SOURCE: brake hydrolic pressure loss.

you still have air in the system,you need to cross bleed the system,RR,LF,LR,RF.if this does not work you might try picking up a hand operated vacum pump to help get all the air out.

Posted on Apr 29, 2009

polarcycle
  • 1392 Answers

SOURCE: Loosing pressure to brakes

Sounds like it is either your master cylinder, or a combination valve leaking. Unbolt the master cylinder and see if it is wet behind it in the booster.

Posted on May 12, 2009

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SOURCE: No brake pressure after changing brakes

Generally with no problems in the hydraulic system you really did not need to bleed the brakes after pad replacement. OK...you did, and that in itself if done properly should not be a problem. Sometimes you need to apply the brakes two or three times to get the caliper pistons to extend to their "working" position.
If after doing that, you still have no pedal, it is likely that your rotors are worn. I know this sounds unusual and that the calipers should take up the slack, but I saw this twice in the last two months, and both times changing the rotors worked.

Posted on Aug 13, 2009

csmock132
  • 4669 Answers

SOURCE: I have a 97 Jetta. I replaced the front brakes and

Sounds like a bad master cylinder.

Posted on Jul 27, 2010

Testimonial: "i replaced my master cylinder and as soon as i did that and bleed my brakes i have now i have my brakes back. thanks a lot"

  • 279 Answers

SOURCE: no pressure in the brake line

Tom,
When the master cylinder [just below the plastic reservoir where you added the fluid] goes empty, air gets in it. Since air can be compressed [unlike liquids] the system does not generate any pressure. You may have to bleed the entire brake system to get the air out. Before you go to all that trouble, there is a short cut you can try. Have someone watch the fluid reservoir [with cap removed] for air bubbles while you gently press the brake pedal about 1/2 way down and release it. This will allow the air trapped in the master cylinder to escape upwards. Repeat until no bubbles are seen in the reservoir and you have a firm pedal. This trick may require up to 50 pumps of the pedal. The truck must be on level ground or with the front of the truck slightly above the rear.
Did you find any brake fluid on the ground? Is so, you must fix that leak. If no fluid was found on the ground, then the leak is the rear seal of the master cylinder. The fluid gets sucked into the power brake booster [big, black metal can behind the master cylinder], then into the engine and out the exhaust. If this is the case, you need to replace the master cylinder to fix the leak. Follow the instructions which will come with the replacement master cylinder to "bench" bleed it prior to installation.

Posted on Nov 26, 2011

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1 Answer

LOSING PRESSURE WHEN I PRESS BRAKE PEDAL, BUT NO OUTSIDE LEAKS


check the brake pads. When they start to wear down, they can have extra play in the pedal causing you to have to press further or pump them. If they are still loosing pressure, check the fluid levels and check again for leakage all through the lines, both front and back.

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Chances are you have a small pin sized hole in your brake lines were your fluid id slowly leaking loosing brake pressure. I would fill the master cyl. full then have a friend look under your car while u step on the peddle to see if u can see any brake fluid leaking anywere. If there is none i would try bleeding the brakes. There could be air in your brake lines also causing this to happen.

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My brakes go to the floor and I have brake fluid coming out from around the back passenger wheel. I am "suppose" to have all new lines.


Either a brake line fitting came loose or you have a caliper leaking. DON'T drive the car this way because soon you will have no brakes.

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I have a 1996 Ford Mustang that has no brakes what so ever. THe brake pads are good and we blead the brakes to no luck. Dont know what is wrong with it please help.


Your master cylinder must be loosing pressure or have a faulty seal. Also if you have any air in your brake lines you will need to start over because the brakes will not work with any air in the lines. Check your brake lines for holes or leaks.

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Sounds like it is either your master cylinder, or a combination valve leaking. Unbolt the master cylinder and see if it is wet behind it in the booster.

May 12, 2009 | 1995 Cadillac Fleetwood

1 Answer

Brake hydrolic pressure loss.


you still have air in the system,you need to cross bleed the system,RR,LF,LR,RF.if this does not work you might try picking up a hand operated vacum pump to help get all the air out.

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Brake petal goes to floor


if you cant find any leaks in lines or cylinders or calipers u probaly have a bad booster
see lots come threw my shop like that but also their is a vacum line that runs to the booster and it hooks to a plastic valve that goes in to the booster those get gloged and you loose pedal as well try replacing that before you bye a new boooster

Mar 26, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Loss of brake pressure


you might check your brake fluid. if it looses preasure than regains it after a second it may be low on fluid allowing air to get into the lines. you might need to blled the breaks to get all the air out of the line. if you need instructions on how to do that let me know.

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