I was going on a long trip so I checked my fluids. I needed to add a little brake fluid. Several days later my brake pedal went to the floor. Checked the fluid level and it was empty. ABS and Brake light came on. Put fluid in. Ran the truck in reverse several times. Checked fluid level again, empty. Refilled. light went out. pedal still goes to the floor. checked again after driving. empty. brake light/ABS light on.
It is not leaking anywhere near the fluid container. Followed the lines down, looking down from the top by the engine,
thank you. can't find the leak. Where underneath is it leaking and how do I fix?
thank you for your help.
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you should be able to add fluid by unscrewing to top of the master cylinder. Check for leaks around the brake lines and calipers, or a leak at the master cylinder(where you check the fluid). If a leak is found you will have to repair it. the rubber brake lines in the wheel wells are susceptible to cracking. then you will have to bleed the brake system with new fluid. I would recommend having a professional do it for you.
YES! You should be very concerned. The breaking fluid must never leak. It can happen anytime that the car loses all breaking power, by leaking more fluid and by air entering the system. Please let a professional check and repair that breaksystem.
You need a new master cylinder. I'm assuming that you aren't losing brake fluid from a leak somewhere.
As the master cylinder wears out it's internal seals allow fluid to leak past the pistons. None actually leaks out of the brake system so you don't see the leakage on the ground under the car and the brake fluid level remains constant.
Replacing the master cylinder is not hard from a technical standpoint but it is a job you'll want a service manual's help with just so you know the proper steps to take. A small, hand operated, vacuum pump is a godsend when you get to the part of bleeding the brakes and this is a good time to flush the brake lines anyway. Proper tools are a must, get a proper line wrench to avoid damaging the brake lines when you remove them from the master, and be careful when reinstalling the lines that you don't start them crooked and cross thread the line fittings.
A good quality rebuilt master cylinder will do the job, or you can spring for the new factory part. Back in the day we used to rebuild them but finding a rebuild kit is impossible these days.
if your car has rear drum then the wheel cylinders could be leaking and in need of replacement. If it has rear disc brakes then it could be leaking fluid where the brake hose goes into the caliper or the brake hose my be worn or have a hole in it. Or it could be a a brake line. You should have it checked because you don't want air getting into the braking system.