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Why do my brakes sink to the floor

Brakes sink to the floor but still hold the truck at a stop I checked for air and leaks all good replaced brake module but still have same problem replaced shoes and pads 3 months prior everything was working well until last night

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If everything was fine, then it just started going to floor...sounds like your master cylinder is bypassing. Usually a fairly easy job, just be sure you bleed master before u bleed brakes. Best way is completly install it, open (loosen) all 4 lines, then press pedal down. HOLD it down until all lines are tight, then release pedsl. repeat. Do this until fluid with no bubbles/foam/air come out of all lines. And do ALL the lines every time regardless of what comes out, don't skip any. Then you can "pump" the pedal, see how it feels, and bleed each wheel if needed. -There is also a slight chance you have a leak you can't see yet...such as a piston seal leaking into caliper boot.

Posted on Nov 29, 2014

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Very bad sign! I would get the car towed to a dealer nearby. It may not be safe to drive. Call the dealer's service department, tell them the symptoms and ask them if it is safe to drive in for repairs. If you have On Star, call them, have them run a diagnostic and ask them if it is safe to drive.

Posted on Nov 29, 2014

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cadman000
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SOURCE: 1999 Pontiac Bonneville SE 3800 ABS Brake pedal will eventually reach floor after stopping while hold car stopped. Brake pads replaced less than 5000 miles ago. Fluid level at max and does not drop. O

I would replace the MASTER CYLINDER. BLEED AIR from master cylinder BEFORE INSTALLATION. Hope this helps

Posted on May 18, 2009

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SOURCE: fading brake pedal

Perfect well at this point i would say that tha abs valve is bypassing fluid. If you can un hook the line that comes into the abs valve and plug it and try and bleed the system where you cap the line going into the abs valve. If you get a good pedal after pluging the line going into the abs valve this tells me that the abs valve is bypassing fluid give it a try i have ran into this a few time and the abs valve has been bad. Also can you rate this sluton also i do hits on my own free time thanks good luck

Posted on Jan 18, 2009

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SOURCE: Brakes no longer work in 1989 Chevy half ton pickup 2 wheel drive 350cubic inch

change dump valve under master cylinder

Posted on Aug 17, 2008

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SOURCE: parking brake pedal goes to floor

Hello;
The parking brake cables may be stretched and in need of adjustment. Follow the cables along to a nut. Then you can tighten the adjusters up on both sides until you have the proper tension. Also make certain none of the brackets are bent or broken that the cables ride through.
Thanks;
RPM Northwest

Posted on Jan 19, 2009

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SOURCE: Brake Pedal goes to the floor in my 1990 Chevy C1500 Scottsdale

do you have a self bleeder kit? first off, you have to bleed the master cyl back into its self and the combination valve before you go to the wheels. when you do that, I think you will find that you have air in the lines. disconnect both brake lines from the master cyl and put the bleeder kit fittings on the master cyl, then put the rubber tubing with the kit on the fittings and submerge it in the brake reservoir. make sure its full. then pump the pedal until you get a hard pedal. if that is the case, reconnect the lines to the master, then have an assistant pump up the brake pedal with the engine off, and bleed the combination valve which should be connected to the master by steel tubing. pump it up, then hold it down, and crack the fittings loose, one at a time until the pedal goes about half way down, but do not release the brake pedal until the line is tight again, otherwise you will **** air in the lines. after you do all that, go to the farthest caliper or wheel cylynder from the master and bleed that with the same technique,and dont release the pedal until you close the bleeder screw. unless you have a major prob, this will work.

Posted on Jul 20, 2009

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1 Answer

Brake pedal sinks to floor when at stop light


The brake system has air in it or a leak past the seals if it does this while stopped.

Are you losing fluid from the reservoir? A leak.

Can you improve the feel of the pedal by pumping it? Air.

Maybe both if the system has not be flushed or maintained for a while.

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This sounds like a bad brake line, these trucks are famous for rotted lines behind gas tank, make sure there are no leaks, this sounds like a leak or a defective master cylinder, if this is the same problem then i would say it is a line also check the rear brakes for leaking wheel cylinders unless you have rear disc brakes, check calipers for leaks.

Take a good look at brake system for leaks, hold brake pedal a few times and let is sink to floor , do it about ten times and then look for a leak, good day

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96' Chevy K1500 Brakes are hard to press, but u hear a lot of air coming out, if i hold the brakes down for too long the truck cuts off.


It sounds like a problem with the brake booster, the air diaphragm that gives you power brakes. It is located right behind the brake master cylinder and mounted to the firewall.
Check the large vacuum hose to it for leaks. If the air is coming out of the unit itself, it will need replacing.
It will stop the engine because with a large air leak, the engine just sucks in way too much air. Hard brakes are also an indication that the booster is not working right. But check the hose first for leaking.
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Mar 27, 2012 | 1996 Chevrolet K1500

1 Answer

I have a 1994 bonneville that you have to push brake pedal to floor and fluid empties within 1 day. Is it the master cylinder or the line?


check all brake lines and wheel cylinders for leakage. if no leaks its probably the master cylinder. symtoms are-- pedal will sink to floor when stopping or not. or master cylinder leaks from behind "it", and runs down brake booster. if booster goes bad the pedal will be very hard! good-day !

Sep 07, 2011 | 1994 Pontiac Bonneville

3 Answers

Break peddle to the floor no resistence behind it, and not stopping well, no noise.


First of all, don't drive with the brakes this way...
Sounds like you've lost the hydraulic pressure in the brake system.
Check the following:
1. Open the hood and check the brake fluid reservoir to make sure it's full of brake fluid. If not, top it off with the recommend brake fluid.
2. Try the brake pedal again, with the car running in PARK, press a few times and see if the pedal "firms up".
3. If it does, press and hold the brake pedal with the motor still running. Look to see if the pedal slowly sinks to the floor or if it's a bit "mushy" or feels ok.

If the pedal sinks to the floor, you've got a major leak in the brake system. This could be from one of the wheel cylinders, from the disk brake caliper piston, a damage brake hose, brake line, a faulty master cylinder, power brake booster.
The best way to check is a visual inspection. Look around each wheel- look for fluid leaks, for signs of fluid where you park, on the axles, under the hood near the brake fluid reservoir, etc.
If after the fluid is topped off, you get a mushy pedal, I would suggest getting the brakes "bled". Bleeding the brakes simply means getting all the air out of the brake lines. (Air compresses where brake fluid won't- if the pedal is mushy it's got air.)
If you've not done brake work before, I highly recommend taking it to a local mechanic to help you out. You really want to KNOW that your brakes are going to be there when you need them. So if in doubt have a mechanic check it out.

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1 Answer

Brake pedal is sometimes sinking to floor. Brake


most likely your master cylinder is acting up try to press hard on your break for a period of time and see if the pedal will sink/replace master

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3 Answers

Brake pedal sinks 1-2 inches while holding


Sounds like your master cylinder is shot. Go to a parking lot, stop, and pump the pedal a bunch of times. Then get out and see if there is any fluid leaks by any of the wheels. That would indicate a brake line leak. My first guess, however, is your master cylinder.

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Brake pedal goes to the floor after you make your initial stop at a red light.while you;re holding the brake


there is either a leak in one of the lines or you have air in the brake lines. start by bleeding your brakes lines and checking you fluid. then see if you notice a leak in which case fix it then bleed that line and you should be good. if not then it could be a bad master cylinder that would be the next step. also if you had your rotors cut down below spec then the pedal could go to the floor and not have much stopping power. same could go for very bad pads. but from what you explained it sounds like a leak

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1 Answer

1990 Dodge Dakota 2wd ext. cab v6


Air in the brake system bleed the air if this doesnt take care of it you may want to check the brake booster

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