Mashed on the brake pedal for a normal stop and the pedal went to the floor

Did you reply? I got an email but nothing came up.

Roy

Follow this procedure to bleed brakes;

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

Also if you have ABS brakes the unit must be held open while bleeding the system if not bunch bleed the master cylinder before installing it.

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

To do this, get a large soda bottle and some clear hose that fits the bleed nipple snugly from your local hardware store.

Fit one end over the bleed screw and run the line higher than the bleed screw then into the bottle. Put a little axle grease on the threads and once you get some of the air out, you can just keep flushing fluid without stopping to hold and release and tighten bleed screw. Since you have so many issues, I would suggest flushing it until it comes out clean.

Starting at the right rear caliper, (This is the farthest from the master cylinder and needs to be done first.)Pump and hold but you can also just pump if the level in the master cylinder is dropping. It takes a while to get fluid going from such a far place especially with a new caliper. To create the pressure to get the fluid going, it has to fill a large cavity the the master cylinder is not designed for. The master cylinder only moves a little bit of fluid when you use your brakes...so be patient, it will come.
If the pedal gets hard to pump, there is contamination somewhere and is often in the bleed screw. Remove it and clean it out.

Now move on to the drivers' side rear brake. Then the passenger side front brake . Then lastly the drivers front brake.

This system of working farthest away from the master cylinder to the closest helps remove the most contamination and helps more fluid to move along.

ALSO, never let the master cylinder get below the low mark. that will pump air into the brakes. If you think bleeding the farthest caliper is hard, a master cylinder is a killer to bleed.

Hey SILVERADO-GAR

Here is a guide that will help you fix the problem

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Please let us know happens so it will help others.

Best, Ken

Good afternoon,

It sounds like you still have air in the system.

I would rent a pressure bleeder, not a vacuum bleeder, and force out all the air in the system. With the length of the truck, it is difficult to get all the air out.

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Roy

Hello my name is Dave.

I have found an easier way to bleed the brakes is to put a little brake fluid in a bottle, just enough to cover the tip of a small hose (I usually use a 16 once water bottle). Next get a few feet of 3/16" washer fluid hose and attach it to the bleeder valve and put the other end in the fluid in the bottle. Open the bleeder and have someone pump the brakes until the the bubbles stop, no need to open and close the valve just leave it open. When the bubbles stop have your helper hold the pedal to the floor and close the valve. Do this starting at the wheel furthest from the master cylinder working your way towards it. This procedure will insure no air is the system. The other thing I was wondering is if you have adjusted the rear brakes, I would make sure they are adjusted prior to any bleeding process. I hope this helps you get your brakes working properly and if you need further assistance please feel free to come back and update us and thank you for using 2CarPros!

As far as the red light, make sure the fluid level is correct. If that is okay, then the proportioning valve has moved to one side.

Usually just pushing down hard on the brake pedal will reset the valve. If not, then the valve may be stuck.

Roy

You have blown a brake line. Because of the year, chances are one of the steel lines has rusted and leaked. Check all brake lines and lines for leaks. If they are all good, and I doubt they are, check rear wheel cylinders and front calipers for problems.

Also, refill the master cylinder and see if after pumping the brakes it goes low again. It should and you should see brake fluid in the area of the leak.

Let me know what you find.