Question about 2000 Pontiac Grand Prix
(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.
Posted on Jul 17, 2009
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
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
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
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
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"
SOURCE: no pressure in the brake line
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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