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I have no brake fluid leaks but the pressure does not build what could be the problem

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No fluid in the master cylinder, or a problem with the vacuum unit.

Sometimes the master cylinder, or the slave cylinder could have a bypass leak internally.
Hope this helps.

Posted on Mar 29, 2015

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No brakes, see fluid leaked out, can't see from where, press while engine running and it won't build up pressure, turn engine off, and it will build up pressure


Air in system can try to bleed brakes but leak needs to be found can wash fluid off with water and let dry add fluid and pump brakes see where fluid is dripping

Nov 18, 2014 | Cars & Trucks

1 Answer

Why do my brakes pump up after bleeding and still go to the floor when i start the truck?


Hello.

If the brakes pump up after you start your engine, it means your brakes are good and there are no bleeds.

They pump up as the car builds pressure inside the brake fluid circuit.

If the pedal loses pressure and hits the floor while the engine is on, this means that you may have brake fluid leaks and your brakes won t hold much longer (needs immediate fix).

Jul 23, 2014 | 1997 Chevrolet Cavalier

1 Answer

My brake pedal is on the floor and the brake fluid continuously goes low. It seems like the vacuum pressure never builds to keep the pedal off of the floor. Any ideas?


You will need to carefully inspect the entire brake system for leaks. Inspect the front calipers, rear wheel cylinders, all the hoses, the back of the master cylinder, and steel lines. If something looks wet or drips brake fluid it is leaking. If you haven't seen any brake fluid dripping from under the car my first thought is that the rear wheel cylinders are leaking.

If the pedal went to the floor and you didn't have to add fluid than you would more than likely have a bad master cylinder but since you are adding fluid there is a leak somewhere.

Nov 12, 2010 | 1992 Toyota Camry V6

1 Answer

Brake fluid is expelled from the top cover of master cylinder when brake pedal is depressed why?


Brake fluid from the Master Cylinder leaks if the Master Cylinder is leaking itself otherwise the leak is somewhere else, have some one check this out, it could be anywhere and you should have seen some drops on the floor by now.

Sounds like a "stuck" caliper piston. Many Chrysler products (by example) used "phenolic" pistons in the calipers which were notorious for seizing in the caliper. Replacement pistons are usually made of steel. With the piston seized heat builds up and ruins the seals in the caliper.

You could have a blown master cylinder that is leaking from the back and into the booster area. Take the cylinder loose from the booster and see if there is fluid in that cavity. Sounds like a massive leak. Look at the rubber hoses and metal lines. The reason you cannot pump up the brakes is because the leak is allowing air to re-enter the system so that pressure cannot build up.

Also, this article could help to check it: how-to-fix-a-brake-fluid-leak

I hope helps (remember to rate and comment this).

Oct 03, 2010 | GMC Sierra 1500 Cars & Trucks

1 Answer

Brake pedal goes all the to the floor. can not


Check the reservoir to be sure the fluid is full. If not, top it off and try it again. If there's still trouble building pressure, pump the brakes a bunch of times, and then check around each wheel for fluid on the ground. If you see none, it's possible that you have a break in the line somewhere through the chassis and that the fluid is leaking out inside. If you see no evidence of leakage, and the reservoir is still full, you need a new brake master cylinder - what will have happened is that the diaphragm around the plunger inside the master cylinder (which moves through the cylinder when you push the pedal, and forces fluid out to the wheels) has a hole or tear in it, so instead of pushing the fluid out to the brakes, the plunger simply moves through the fluid. It never builds pressure, and your brakes don't work.

Dec 22, 2009 | 1992 Cadillac DeVille

1 Answer

Brake pedal travels all the way to the floor.pressure builds when you pump the pedal.resivoir full of fluid and no lines are leaking.


Fluid may be bypassing seals inside the master cylinder giving you a low pedal on first application and building up as it continues to be pumped. If drum brakes make sure rear brakes a well adjusted

Oct 23, 2009 | 1996 Pontiac Sunfire

2 Answers

1999 jeep cherokee limited- no pressure when I press break down, small leak beneath left tire I re-filled brake fluid, what should I do next?


you need to bleed the brakes,,get any air in the system out.....but make sure you fix that leak or the pipe or what ever is wrong first,,,,then get help bleeding the brakes ,,,you kinda have to no how to bleed them though you need 2 people one pumping the brakes the other bleeding the calipers,,,,

Apr 21, 2009 | 1999 Jeep Cherokee

2 Answers

1989 mazda mx6 brake fluid leaking


You have a leak in the master cylinder. If brake fluid is leaking into the vehicle I would say I have not heard of this problem before but anything is possible anyway the likely problem is the master cylinder is worn and leaking fluid and air - that's why you have to puimp the brakes. It really isn't that expensive if you provide the parts once it is diagnosed - you really should get it repaired right away though because they can go out completely without warning. Hope this helps.

Dec 31, 2008 | 1989 Mazda MX-6

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