Question about Chevrolet Lumina

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I have a 1992 chev lumina Z34 with a 3.4 motor when the car is off the brake peddle is rock hard but when i start the car the peddle becomes soft and low. i have bleed the car more than once and the brakes become the same way everytime... the rotors and pads are new, lines are all good; i'm puzzled help

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  • newcarlisle Aug 29, 2008

    i'll check this tomorrow and let you know

  • newcarlisle Aug 30, 2008

    tryied the booster tonight; peddle is hard when car is off; no play at all;; when i start the car the peddle goes down drastically, not to the floor but down at least 3 or 4 inches, does that mean the booster is done?

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Master Cylinder (Brake System) :
Worn or leaking brake master cylinder.
Brake Power Booster :
Damaged booster vacuum line/check valve, or diaphram .
Brake Proportioning Valve :
Improper installation/adjustment or damaged proportioning valve .

plz rate this post

Posted on Aug 29, 2008

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Double check the bushing and the spacer on the brake system assembly if they are very tight. Adjusting them might fix it.

When we step on the brake pedal, the booster's diaphragm squeezes the air in the front side of the booster. This pressure unseats the check valve that controls intake manifold vacuum. When the check valve opens, manifold vacuum sucks the air out of the booster. This "suction," called negative pressure, pulls the diaphragm forward, which applies forward pressure on the rod and master cylinder piston. The power booster helps us apply the brakes. You may need to do some checking on this vacuum parts.

Posted on Aug 29, 2008

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Please check the link im sending you.
http://www.automotix.net/autorepair/repairtips/

Posted on Aug 29, 2008

  • hemant somaiya
    hemant somaiya Aug 29, 2008

    every thing about cars please check its a free link.you do not have to pay for this.

    thanks.please do rate the solution.

  • hemant somaiya
    hemant somaiya Aug 29, 2008





    Keep Safe With A Timely Brake Repair Service

    When it comes to driving a car, the first thing that comes to our mind is Brakes. But what if the brakes give up midway and a mechanic is not available to help you out? Truth be told, one can't always rely on a mechanic to get the brakes done. Some elementary knowledge is always helpful. So don't allow your car brake system to let you down and always try to get a control over its mechanism.

    So here we start off with some basic tips to repair your brakes.

    Visual Inspection
    The initial stage requires a visual inspection. A visual inspection takes a few minutes and is done every time the oil change takes place. One can start with checking the color of the fluid in the master cylinder. The change in the color of the oil can help in identifying the impending problems. A transparent and almost clear fluid is good news. But if the color of the fluid turns brown, this means it has expired and is not suitable for the vehicle.

    Further Inspection And Cleaning

  • Mud and road salts are the most common elements that can affect your brakes. For that it is very important to clean the brakes frequently. Carefully remove the first wheel and try to remove as much gunk and debris as possible. While the drums and rear wheels are off, brake parts cleaner should be used to clean the rear brakes. There may be many causes behind the failure of the car brakes but solid dirt particles are the most common ones. So it is always good to start with the brushing and cleaning.
  • Then, if the front and rear parts do not operating properly, these parts need to be replaced.
  • After that, the inspection of brake rotors should be done. Brake rotors are commonly known as discs.
  • Brake drums that are damaged should also be replaced.
  • Next stage involves the inspection of wheel bearings. After the inspection is done, Shoe pads and Caliper slides should be lubricated with moly-based brake grease.
  • To get rid of moisture contamination, it is important to get the brake fluid checked. It involves the inspection of all the brake lines including the wheel cylinders, hoses, master cylinders and calipers. Wheel cylinders and calipers should be checked to detect leakage and severe corrosion. If the master cylinder is found leaking, it should be replaced or rebuilt.
  • The "brake pad wear sensor" on the pad should be inspected for damage or cracks.
  • The final round of inspection requires, ABS (Anti Brake System) check. Always make sure that the pedal is comfortable, and the brakes function properly and quietly to provide you prompt stopping. It is advisable to check each and every component in the brake. If any part of the Brake is damaged or worn out, it should be immediately replaced. After all it's a matter of ones safety.


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