Question about 2005 Pontiac Grand Prix

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Brake sys failing have to pump breaks. never messed with the system itself and master cylinder was never low

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YEP AIR IN BRAKE SYSTEM OR MASTER CYLINDER IS FAULTY.IF BRAKE FLUID NOT LOW. NOT SAFE TO DRIVE HAVE CAR TOWED IN.

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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2 Answers

I keep loosing break pressure and I have to keep pumping my breaks is this a major problem


YES.
1.could be you need break fluid
2,break pads getting low.
3.slave cylinder faulty.
4.master cylinder faulty.
5.air in the system
6. get it checked out asap and dont drive it just incase your breaks stop working.

Dec 05, 2016 | Cars & Trucks

2 Answers

Think master cylinder is going out, had no breaks added fluid and pumped breaks seemed fine when to drive and went out . How can I be sure.


their are two brake lights one for e-brake on and the other is main brake system to alert you to low fluid in master cylinder --you have a leak somewhere look under vehicle for fluid by tires on ground even if you put fluid in master you still wont have brakes do to air in lines and until leak repair

Aug 06, 2015 | Ford Cars & Trucks

2 Answers

My brake pedal slowly losing pressure goes to the floor and then I have to pump it up again


If you break fluid level is correct and your break pedal goes down to the floor means that your master cylinder is going bad and you might loose your breaks completely if not checked or replaced. Your breaking system is down to the last O ring inside the master cylinder, once that rubber O rings goes you will not have any breaks at all. Master cylinders have a number of rubber O rings that work like a plunger or piston that produce pressure within the breaking system. When the first one wears down due to age, your pedal begins to loose break pressure and you have to pump your breaks several times to gain breaking. You are now down to the last rubber O ring and a warning that your master cylinder needs to be checked. You can still use your breaks but only for a few days before the other rubber O ring gives out too. Once both O rings give out you completely loose your breaks.

Apr 12, 2015 | Cars & Trucks

3 Answers

Okay,the break peddle go all the way down. No presser in the breaks


Check the brake fluid level in the Master Cylinder. If it is good, then the most likely problem is a failed master cylinder. If the fluid is low or there is no fluid, you will need to track down and fix the source of the leak, bleed the brake system of air, and retest.

Mar 28, 2015 | Cars & Trucks

3 Answers

No brakespedal goes to the floor and will not stop


Do you have rusted out brake tubing or a blown
brake flex hose
Obviously & rarely do brakes go to the floor
Can't see the issue from the internet

Aug 07, 2013 | Ford Freestar Cars & Trucks

1 Answer

BRAKE PEDAL GETS HARD WHILE BREAKING


brake switch bad, system needs bled, rear brake circuit probably has air in fluid, fluid is no doubt contaminated, nobody addresses this maintainance problem, bleed entire brake system, replace all fluid w/ new. if fluid in the master cylinder is black, seals are bad, some brake systems have a pump as part of master cylinder, these pumps run off fuses , 25amp, etc., check what system you have. is your fluid level correct ? the switch I refer to is @ proportioning valve below master cylinder @ frame, see abs brakes use this valve to prevent skidding, rear brakes must come on first, before front brakes. if valve is not in balance a hard brake pedal occurs, as with low fluid levels. does your brake light come on ? @ dash. have a brake shop bleed your system, if there's a problem they'll find it for you, let them do it, don't wast your time.

Jan 13, 2013 | 1994 Toyota Land Cruiser

2 Answers

My 1996 Chevrolet K3500 Dually has a hydraulic clutch, how do I change the fluid and bleed it.


FIRST REMOVE ALL OLD FLUID FROM CLUTCH MASTER CYLINDER YOU CAN USE A SIPHON YOU HAND PUMP.AUTO PARTS STORES SELLS THE HAND PUMP SIPHONS. THEY DONT COST MUCH AND KEEP FROM MAKING A MESS.SIPHON OUT MUCH AS YOU CAN THE OLD FLUID IN THE CLUTCH MASTER CYLINDER.THEN POUR IN THE NEW FLUID DOT 3 BRAKE FLUID IN CLUTCH MASTER CYLINDER.OKAY YOU NEED A HELPER.LOCATE THE SLAVE CYLINDER.REMOVE SLAVE CYLINDER HOLD SLAVE CYLINDER 45 DEGREES WITH BLEEDER SCREW LOCATED AT THE HIGHEST POINT.HAVE A SMALL DRAIN PAN UNDER SLAVE CYLINDER.HAVE HELPER FULLY DEPRESS AND HOLD THE CLUTCH PEDAL THEN OPEN BLEED SCREW.CLOSE THE BLEED SCREW AND HAVE HELPER RELEASE THE CLUTCH PEDAL.REPEAT THIS PROCESS UNTIL ALL THE OLD BRAKE FLUID AND AIR BUBBLES LEAVES THE HYDRALIC SYSTEM AND WHEN YOU CAN SEE GOOD STREAM CLEAN FLUID NO BUBBLES YOU HAVE GOOD SOLID CLUTCH ALL IS GOOD.MAKE SURE THROUGH THE BLEEDING PROCESS YOU DONT LET CLUTCH MASTER CYLINDER RUN DRY OR YOU WILL HAVE TO START OVER.KEEP CLUTCH MASTER CYLINER FULL BRAKE FLUID WHILE DOING THE WHOLE BLEEDING AND FLUSHING PROCESS.

Jan 22, 2011 | 1996 Chevrolet C/K 3500

1 Answer

My brake light stays on and no brakes. replaced brakes, bled, replaced line, bled..works for a day or so and then brakelight comes on and no brakes again..what could be making this happen????


Check the master cylinder and if it's low again, check system for leaks...likely you have another you didn't see...Also check the rear of the master itself for seepage. If you can pump the brake and get the pressure back but it then sinks down while holding moderate pressure on it, the cylinder itself is bypassing.

Dec 01, 2010 | Jeep Grand Cherokee Cars & Trucks

2 Answers

Just changed rotors and front brake pads. Pumped pressure back with break pedal. After you start vehicle all break pressure is lost- no breaks. Whats going on?


You are either low on brake fluid or you have a vacum problem. It is a long shot but possible the Master Cylinder is having an issue or an air bubble in the system. Start the vehicle and make sure it is blocked. With the engine running perform system bleeds on all four calipers. Pump 3 times then release bleed valve. You are going to need a couple bottles of brake fluid to bleed all these calipers and get the air out of the lines. You should make sure the primary vacum is connected to the master cylinder and that there are no leaks on any lines before you start the bleeding process.

Jun 24, 2010 | 1999 Toyota 4Runner

1 Answer

Bad brakes on gmc suburban, replaced master cylinder,rear wheel cylinder and abs control module,bled system,still have spongy brakes and ABS come on right before it gets stopped.


Gravity bleed your brakes starting at the wheel farthest from the master cylinder. No pweddle pumping. I Fill M/C and leave cover off. Then open the bleeder and watch what is coming out. Uou can see bubbles. When the fluid drips steady and without bubbles, cole and do the same to the other three. Don't let the master cykinder get low because thr fluid level helps move the fluid and air through the lines.Periodically tap the break lone with your wrench to keep everything moving.. When sll bleeders drip clean and steady. Make sore your rear brakes are adjusted to barely touch the drum. Then top off the master cylinder, cap it and give yourself a "break". :)

Jun 15, 2009 | 1997 GMC Sierra K2500

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